10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2018

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission file number 001-14905

BERKSHIRE HATHAWAY INC.

(Exact name of registrant as specified in its charter)

Delaware	47-0813844
(State or other jurisdiction of             incorporation or organization)	(I.R.S. Employer                     Identification Number)

3555 Farnam Street, Omaha, Nebraska 68131

(Address of principal executive office)

(Zip Code)

(402) 346-1400

(Registrant’s telephone number, including area code)

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ☐    No  ☒

Number of shares of common stock outstanding as of October 25, 2018:

Class A —	733,152
Class B —	1,362,792,906

BERKSHIRE HATHAWAY INC.

		Page No.
Part I – Financial Information
Item 1. Financial Statements
	Consolidated Balance Sheets—September 30, 2018 and December 31, 2017		2-3
	Consolidated Statements of Earnings—Third Quarter and First Nine Months 2018 and 2017		4
	Consolidated Statements of Comprehensive Income— Third Quarter and First Nine Months 2018 and 2017		5
	Consolidated Statements of Changes in Shareholders’ Equity—First Nine Months 2018 and 2017		5
	Consolidated Statements of Cash Flows—First Nine Months 2018 and 2017		6
	Notes to Consolidated Financial Statements		7-25
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		26-44
Item 3.	Quantitative and Qualitative Disclosures About Market Risk		45
Item 4.	Controls and Procedures		45
Part II – Other Information			45
Item 1.	Legal Proceedings		45
Item 1A.	Risk Factors		45
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds and Issuer Repurchases of Equity Securities		45
Item 3.	Defaults Upon Senior Securities		46
Item 4.	Mine Safety Disclosures		46
Item 5.	Other Information		46
Item 6.	Exhibits		46
Signature			46

1

Part I Financial Information

Item 1. Financial Statements

BERKSHIRE HATHAWAY INC.

and Subsidiaries

CONSOLIDATED BALANCE SHEETS

(dollars in millions)

	September 30, 2018		December 31, 2017
	(Unaudited)
ASSETS
Insurance and Other:
Cash and cash equivalents*	$	36,506	$	25,460
Short-term investments in U.S. Treasury Bills		59,947		78,515
Investments in fixed maturity securities		18,271		21,353
Investments in equity securities		201,226		164,026
Investment in The Kraft Heinz Company		17,453		17,635
Receivables		31,884		28,578
Inventories		16,793		16,187
Property, plant and equipment		24,357		20,104
Goodwill		54,985		54,985
Other intangible assets		31,626		32,518
Deferred charges under retroactive reinsurance contracts		14,451		15,278
Other		13,250		11,158
		520,749		485,797
Railroad, Utilities and Energy:
Cash and cash equivalents*		3,297		2,910
Property, plant and equipment		130,387		128,184
Goodwill		24,790		24,780
Regulatory assets		2,928		2,950
Other		16,020		15,589
		177,422		174,413
Finance and Financial Products:
Cash and cash equivalents*		1,635		3,213
Short-term investments in U.S. Treasury Bills		2,258		5,856
Loans and finance receivables		14,477		13,748
Property, plant and equipment and assets held for lease		10,273		9,931
Goodwill		1,552		1,493
Other		8,093		7,644
		38,288		41,885
	$	736,459	$	702,095

* Cash and cash equivalents includes U.S. Treasury Bills with maturities of three months or less when purchased of $14.7 billion at September 30, 2018 and $5.7 billion at December 31, 2017.

See accompanying Notes to Consolidated Financial Statements

2

BERKSHIRE HATHAWAY INC.

and Subsidiaries

CONSOLIDATED BALANCE SHEETS

(dollars in millions)

	September 30, 2018		December 31, 2017
	(Unaudited)
LIABILITIES AND SHAREHOLDERS’ EQUITY
Insurance and Other:
Unpaid losses and loss adjustment expenses	$	64,263	$	61,122
Unpaid losses and loss adjustment expenses under retroactive reinsurance contracts		41,935		42,937
Unearned premiums		19,011		16,040
Life, annuity and health insurance benefits		18,368		17,608
Other policyholder liabilities		6,692		7,654
Accounts payable, accruals and other liabilities		27,178		23,099
Notes payable and other borrowings		24,271		27,324
		201,718		195,784
Railroad, Utilities and Energy:
Accounts payable, accruals and other liabilities		11,269		11,334
Regulatory liabilities		7,723		7,511
Notes payable and other borrowings		62,599		62,178
		81,591		81,023
Finance and Financial Products:
Accounts payable, accruals and other liabilities		1,752		1,470
Derivative contract liabilities		1,869		2,172
Notes payable and other borrowings		10,770		13,085
		14,391		16,727
Income taxes, principally deferred		59,340		56,607
Total liabilities		357,040		350,141
Shareholders’ equity:
Common stock		8		8
Capital in excess of par value		35,713		35,694
Accumulated other comprehensive income		(3,927)		58,571
Retained earnings		346,503		255,786
Treasury stock, at cost		(2,691)		(1,763)
Berkshire Hathaway shareholders’ equity		375,606		348,296
Noncontrolling interests		3,813		3,658
Total shareholders’ equity		379,419		351,954
	$	736,459	$	702,095

See accompanying Notes to Consolidated Financial Statements

3

BERKSHIRE HATHAWAY INC.

and Subsidiaries

CONSOLIDATED STATEMENTS OF EARNINGS

(dollars in millions except per share amounts)

	Third Quarter				First Nine Months
	2018		2017		2018		2017
	(Unaudited)				(Unaudited)
Revenues:
Insurance and Other:
Insurance premiums earned	$	14,333	$	13,349	$	41,855	$	47,469
Sales and service revenues		33,249		32,055		98,128		94,017
Interest, dividend and other investment income		1,619		1,320		4,468		3,804
		49,201		46,724		144,451		145,290
Railroad, Utilities and Energy operating and other revenues		11,818		10,633		32,815		29,833
Finance and Financial Products:
Sales and service revenues		2,057		1,790		5,742		4,936
Interest, dividend and other investment income		374		360		1,115		1,074
		2,431		2,150		6,857		6,010
Total revenues		63,450		59,507		184,123		181,133
Investment and derivative contract gains/losses:
Investments gains (losses)		14,569		657		12,750		1,262
Derivative contract gains (losses)		137		308		303		703
		14,706		965		13,053		1,965
Costs and expenses:
Insurance and Other:
Insurance losses and loss adjustment expenses		9,932		12,137		28,296		39,450
Life, annuity and health insurance benefits		1,448		1,213		4,153		3,703
Insurance underwriting expenses		2,352		2,207		7,079		6,924
Cost of sales and services		26,789		25,815		78,684		75,594
Selling, general and administrative expenses		3,984		3,965		12,158		12,101
Interest expense		116		435		246		1,405
		44,621		45,772		130,616		139,177
Railroad, Utilities and Energy:
Cost of sales and operating expenses		8,087		6,984		23,451		20,678
Interest expense		698		700		2,110		2,090
		8,785		7,684		25,561		22,768
Finance and Financial Products:
Cost of sales and services		1,273		1,062		3,519		2,891
Selling, general and administrative expenses		564		531		1,549		1,442
Interest expense		82		98		253		305
		1,919		1,691		5,321		4,638
Total costs and expenses		55,325		55,147		161,498		166,583
Earnings before income taxes and equity method earnings		22,831		5,325		35,678		16,515
Equity method earnings		316		305		1,044		932
Earnings before income taxes		23,147		5,630		36,722		17,447
Income tax expense		4,440		1,427		7,009		4,750
Net earnings		18,707		4,203		29,713		12,697
Earnings attributable to noncontrolling interests		167		136		300		308
Net earnings attributable to Berkshire Hathaway shareholders	$	18,540	$	4,067	$	29,413	$	12,389
Net earnings per average equivalent Class A share*	$	11,280	$	2,473	$	17,885	$	7,533
Net earnings per average equivalent Class B share*	$	7.52	$	1.65	$	11.92	$	5.02
Average Class A shares outstanding		736,262		756,528		744,126		766,245
Average Class B shares outstanding		1,360,940,890		1,332,192,917		1,350,588,758		1,317,463,821

* Class B shares are economically equivalent to one-fifteen-hundredth of a Class A share. Accordingly, net earnings per average equivalent Class B share outstanding is equal to one-fifteen-hundredth of the equivalent Class A amount. See Note 19.

See accompanying Notes to Consolidated Financial Statements

4

BERKSHIRE HATHAWAY INC.

and Subsidiaries

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(dollars in millions)

	Third Quarter				First Nine Months
	2018		2017		2018		2017
	(Unaudited)				(Unaudited)
Net earnings	$	18,707	$	4,203	$	29,713	$	12,697
Other comprehensive income:
Net change in unrealized appreciation of investments		5		4,952		(132)		18,040
Applicable income taxes		(1)		(1,716)		19		(6,247)
Reclassification of investment appreciation in net earnings		(34)		(646)		(299)		(1,235)
Applicable income taxes		7		226		63		432
Foreign currency translation		(79)		771		(842)		2,127
Applicable income taxes		9		(24)		46		(116)
Prior service cost and actuarial gains/losses of defined benefit pension plans		(13)		(3)		50		(57)
Applicable income taxes		3		6		—		31
Other, net		(21)		32		(57)		38
Other comprehensive income, net		(124)		3,598		(1,152)		13,013
Comprehensive income		18,583		7,801		28,561		25,710
Comprehensive income attributable to noncontrolling interests		162		203		271		436
Comprehensive income attributable to Berkshire Hathaway shareholders	$	18,421	$	7,598	$	28,290	$	25,274

BERKSHIRE HATHAWAY INC.

and Subsidiaries

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY

(Unaudited)

(dollars in millions)

	Berkshire Hathaway shareholders’ equity										Total
	Common stock and capital in excess of par value		Accumulated other comprehensive income		Retained earnings		Treasury stock		Non- controlling interests
First nine months 2017:
Balance at December 31, 2016	$	35,689	$	37,298	$	210,846	$	(1,763)	$	3,358	$	285,428
Net earnings		—		—		12,389		—		308		12,697
Other comprehensive income, net		—		12,885		—		—		128		13,013
Issuance of common stock		58		—		—		—		—		58
Transactions with noncontrolling interests		(55)		—		—		—		(220)		(275)
Balance at September 30, 2017	$	35,692	$	50,183	$	223,235	$	(1,763)	$	3,574	$	310,921
First nine months 2018:
Balance at December 31, 2017	$	35,702	$	58,571	$	255,786	$	(1,763)	$	3,658	$	351,954
Adoption of new accounting pronouncements		—		(61,375)		61,304		—		—		(71)
Net earnings		—		—		29,413		—		300		29,713
Other comprehensive income, net		—		(1,123)		—		—		(29)		(1,152)
Issuance (acquisition) of common stock		54		—		—		(928)		—		(874)
Transactions with noncontrolling interests		(35)		—		—		—		(116)		(151)
Balance at September 30, 2018	$	35,721	$	(3,927)	$	346,503	$	(2,691)	$	3,813	$	379,419

See accompanying Notes to Consolidated Financial Statements

5

BERKSHIRE HATHAWAY INC.

and Subsidiaries

CONSOLIDATED STATEMENTS OF CASH FLOWS

(dollars in millions)

	First Nine Months
	2018		2017
	(Unaudited)
Cash flows from operating activities:
Net earnings	$	29,713	$	12,697
Adjustments to reconcile net earnings to operating cash flows:
Investment gains/losses		(12,750)		(1,262)
Depreciation and amortization		7,169		6,835
Other		(677)		1,110
Changes in operating assets and liabilities:
Losses and loss adjustment expenses		2,272		22,615
Deferred charges reinsurance assumed		827		(5,525)
Unearned premiums		2,974		2,253
Receivables and originated loans		(4,781)		(2,890)
Other assets		(1,788)		(1,287)
Other liabilities		805		360
Income taxes		2,791		2,593
Net cash flows from operating activities		26,555		37,499
Cash flows from investing activities:
Purchases of U.S. Treasury Bills and fixed maturity securities		(85,502)		(106,597)
Purchases of equity securities		(38,552)		(14,936)
Sales of U.S. Treasury Bills and fixed maturity securities		26,903		35,143
Redemptions and maturities of U.S. Treasury Bills and fixed maturity securities		83,742		65,666
Sales and redemptions of equity securities		14,164		10,572
Purchases of loans and finance receivables		(1,748)		(1,392)
Collections of loans and finance receivables		266		1,599
Acquisitions of businesses, net of cash acquired		(521)		(2,640)
Purchases of property, plant and equipment		(10,040)		(8,411)
Other		257		(150)
Net cash flows from investing activities		(11,031)		(21,146)
Cash flows from financing activities:
Proceeds from borrowings of insurance and other businesses		55		1,321
Proceeds from borrowings of railroad, utilities and energy businesses		7,019		2,812
Proceeds from borrowings of finance businesses		2,339		1,298
Repayments of borrowings of insurance and other businesses		(2,661)		(1,763)
Repayments of borrowings of railroad, utilities and energy businesses		(3,658)		(1,944)
Repayments of borrowings of finance businesses		(4,661)		(3,605)
Changes in short term borrowings, net		(2,754)		122
Acquisition of treasury stock		(928)		—
Other		(277)		(108)
Net cash flows from financing activities		(5,526)		(1,867)
Effects of foreign currency exchange rate changes		(109)		222
Increase in cash and cash equivalents and restricted cash		9,889		14,708
Cash and cash equivalents and restricted cash at beginning of year		32,212		28,643
Cash and cash equivalents and restricted cash at end of third quarter *	$	42,101	$	43,351
* Cash and cash equivalents and restricted cash are comprised of the following:
Beginning of year—
Insurance and Other	$	25,460	$	23,581
Railroad, Utilities and Energy		2,910		3,939
Finance and Financial Products		3,213		528
Restricted cash, included in other assets		629		595
	$	32,212	$	28,643
End of third quarter—
Insurance and Other	$	36,506	$	35,247
Railroad, Utilities and Energy		3,297		4,448
Finance and Financial Products		1,635		3,011
Restricted cash, included in other assets		663		645
	$	42,101	$	43,351

See accompanying Notes to Consolidated Financial Statements

6

BERKSHIRE HATHAWAY INC.

and Subsidiaries

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

September 30, 2018

Note 1. General

The accompanying unaudited Consolidated Financial Statements include the accounts of Berkshire Hathaway Inc. (“Berkshire” or “Company”) consolidated with the accounts of all its subsidiaries and affiliates in which Berkshire holds controlling financial interests as of the financial statement date. In these notes, the terms “us,” “we” or “our” refer to Berkshire and its consolidated subsidiaries. Reference is made to Berkshire’s most recently issued Annual Report on Form 10-K (“Annual Report”), which includes information necessary or useful to understanding Berkshire’s businesses and financial statement presentations. Our significant accounting policies and practices were presented as Note 1 to the Consolidated Financial Statements included in the Annual Report. Changes to those policies due to the adoption of new accounting standards effective January 1, 2018 are described in Note 2. Certain immaterial amounts related to equity method earnings were reclassified in the accompanying 2017 Consolidated Financial Statements to conform to current presentations.

Financial information in this Quarterly Report reflects all adjustments (consisting only of normal recurring adjustments) that are, in the opinion of management, necessary to a fair statement of results for the interim periods in accordance with accounting principles generally accepted in the United States (“GAAP”). For a number of reasons, our results for interim periods are not normally indicative of results to be expected for the year. The timing and magnitude of catastrophe losses incurred by insurance subsidiaries and the estimation error inherent to the process of determining liabilities for unpaid losses of insurance subsidiaries can be more significant to results of interim periods than to results for a full year. Changes in market prices of the equity securities we own can produce significant effects on our consolidated shareholders’ equity. Beginning in 2018, those effects are included in our Consolidated Statements of Earnings, whereas in pre-2018 periods, such effects were included in other comprehensive income. In addition, changes in the fair values of certain derivative contract liabilities and gains and losses from the periodic revaluation of certain assets and liabilities denominated in foreign currencies can cause significant variations in our periodic net earnings.

Note 2. New Accounting Pronouncements

On January 1, 2018, we adopted Accounting Standards Update (“ASU”) 2016-01 “Financial Instruments—Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”), ASU 2018-02 “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” (“ASU 2018-02”) and Accounting Standards Codification (“ASC”) 606 – “Revenues from Contracts with Customers” (“ASC 606”). A summary of the effects of the initial adoption of ASU 2016-01, ASU 2018-02 and ASC 606 follows (in millions).

	ASU 2016-01		ASU 2018-02		ASC 606		Total
Increase (decrease):
Assets	$	—	$	—	$	3,382	$	3,382
Liabilities		—		—		3,453		3,453
Accumulated other comprehensive income		(61,459)		84		—		(61,375)
Retained earnings		61,459		(84)		(71)		61,304
Shareholders’ equity		—		—		(71)		(71)

With respect to ASU 2016-01, beginning in 2018, we are including unrealized gains and losses arising from the changes in the fair values of our equity securities during the period as a component of investment gains in the Consolidated Statements of Earnings. For periods ending prior to January 1, 2018, we recognized gains and losses in earnings when we sold equity securities, based on the difference between the sale proceeds and the cost of the securities, and for other-than-temporary impairment losses. We recorded unrealized gains and losses from the changes in fair value of available-for-sale equity securities in other comprehensive income. We continue to carry our investments in equity securities at fair value and there is no change to the asset values or total shareholders’ equity amounts we would have otherwise recorded. ASU 2016-01 prohibited the restatement of prior year financial statements. However, as of January 1, 2018, we reclassified net after-tax unrealized gains on equity securities from accumulated other comprehensive income to retained earnings.

7

Notes to Consolidated Financial Statements (Continued)

Note 2. New Accounting Pronouncements (Continued)

In connection with our adoption of ASU 2018-02, we reclassified the stranded deferred income tax effects that were included in accumulated other comprehensive income as of January 1, 2018 to retained earnings. These stranded income tax effects arose from the reduction in the U.S. statutory income tax rate under the U.S. Tax Cuts and Jobs Act enacted on December 22, 2017. The effect of the reduction in the statutory income tax rate on accumulated other comprehensive income items was recorded in earnings in December 2017. Prior year financial statements were not restated.

We adopted ASC 606 using the modified retrospective method, whereby the cumulative effect of the adoption was recorded as an adjustment to retained earnings. Prior year financial statements were not restated. The initial adoption of ASC 606 as of January 1, 2018 resulted in increases to assets and other liabilities, with a relatively minor reduction in retained earnings. Prior to January 1, 2018, we recognized revenues from the sales of fractional ownership interests in aircraft over the term of the related management services agreements, as the transfers of the ownership interests were inseparable from the management services agreements. These agreements also include provisions that require us to repurchase the fractional interest at fair market value at contract termination or upon the customer’s request following the end of a minimum commitment period. ASC 606 provides that such contracts are subject to accounting guidance for lease contracts and not ASC 606. The principal effects of this re-characterization were to increase both property, plant and equipment and other liabilities by approximately $3.5 billion. The re-characterization of these fractional ownership interests as operating leases did not have a material effect on our consolidated revenues or earnings for the first nine months of 2018.

In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-02 “Leases,” which together with subsequent amendments is included in ASC 842. Most significantly, ASC 842 requires a lessee to recognize a liability to make lease payments and an asset with respect to its right to use the underlying asset for the lease term. ASC 842 also addresses accounting and reporting by lessors, which is not significantly different from current accounting and reporting, and further provides for qualitative and quantitative disclosures. We intend to adopt ASC 842 as of January 1, 2019 under the modified retrospective method.

We are party to contracts where we are the lessee and other contracts where we are the lessor. For contracts where we are the lessee, we will record lease liabilities and right of use assets for contracts in effect on January 1, 2019 based on the facts and circumstances as of that date. While we continue to evaluate certain provisions of ASC 842, based on our current estimates, we expect to recognize right of use assets and lessee lease liabilities of approximately $6 billion with respect to operating leases. We do not believe the adoption of ASC 842 will have a material effect on our consolidated financial position, results of operations or cash flows.

In June 2016, the FASB issued ASU 2016-13 “Financial Instruments—Credit Losses,” which provides for the recognition and measurement at the reporting date of all expected credit losses for financial assets held at amortized cost and available-for-sale debt securities. Currently, credit losses are recognized and measured when such losses become probable based on the prevailing facts and circumstances. ASU 2016-13 is effective for reporting periods beginning after December 15, 2019. We are currently evaluating the effect this standard will have on our Consolidated Financial Statements.

In January 2017, the FASB issued ASU 2017-04 “Simplifying the Test for Goodwill Impairment.” ASU 2017-04 eliminates the requirement to determine the implied value of goodwill in measuring an impairment loss. Upon adoption of ASU 2017-04, the measurement of a goodwill impairment will represent the excess of the reporting unit’s carrying value over fair value, limited to the carrying value of goodwill. ASU 2017-04 is effective for goodwill impairment tests in fiscal years beginning after December 15, 2019, with early adoption permitted.

In August 2018, the FASB issued ASU 2018-12 “Targeted Improvements to the Accounting for Long-Duration Contracts.” ASU 2018-12 requires periodic reassessment of actuarial and discount rate assumptions used in the valuation of policyholder liabilities and deferred acquisition costs arising from the issuance of long-duration insurance and reinsurance contracts, with the effects of changes in cash flow assumptions reflected in earnings and the effects of changes in discount rate assumptions reflected in other comprehensive income. Under current accounting guidance, the actuarial and discount rate assumptions are set at the contract inception date and not subsequently changed, except under limited circumstances. ASU 2018-12 also requires new disclosures and is effective for fiscal years beginning after December 15, 2020, with early adoption permitted. We are evaluating the effect this standard will have on our Consolidated Financial Statements.

8

Notes to Consolidated Financial Statements (Continued)

Note 3. Revenues from contracts with customers

As discussed in Note 2, on January 1, 2018, we adopted ASC 606 “Revenues from Contracts with Customers.” Except as described in Note 2, our revenue recognition practices for contracts with customers under ASC 606 do not differ significantly from prior practices. Under ASC 606, revenues are recognized when a good or service is transferred to a customer. A good or service is transferred when (or as) the customer obtains control of that good or service. Revenues are based on the consideration we expect to receive in connection with our promises to deliver goods and services to our customers. Our accounting policies related to revenue from contracts with customers follow.

We manufacture and/or distribute a wide variety of industrial, building and consumer products. Our sales contracts provide customers with these products through wholesale and retail channels in exchange for consideration specified under the contracts. Contracts generally represent customer orders for individual products at stated prices. Sales contracts may contain either single or multiple performance obligations. In instances where contracts contain multiple performance obligations, we allocate the revenue to each obligation based on the relative stand-alone selling prices of each product or service.

Sales revenue reflects reductions for returns, allowances, volume discounts and other incentives, some of which may be contingent on future events. In certain customer contracts of our grocery distribution business, sales revenue includes certain state and local excise taxes billed to customers on specified products when those taxes are levied directly upon us by the taxing authorities. Sales revenue excludes sales taxes and value-added taxes collected on behalf of taxing authorities. Sales revenue includes consideration for shipping and other fulfillment activities performed prior to the customer obtaining control of the goods. We also elect to treat consideration for such services performed after control has passed to the customer as sales revenue.

Our product sales revenues are generally recognized at a point in time when control of the product transfers to the customer, which coincides with customer pickup or product delivery or acceptance, depending on terms of the arrangement. We recognize sales revenues and related costs with respect to certain contracts over time, primarily from certain castings, forgings and aerostructures contracts. Control of the product units under these contracts transfers continuously to the customer as the product is manufactured. These products generally have no alternative use and the contract requires the customer to provide reasonable compensation if terminated for reasons other than breach of contract.

Our energy revenue derives primarily from tariff based sales arrangements approved by various regulatory bodies. These tariff based revenues are mainly comprised of energy, transmission, distribution and natural gas and have performance obligations to deliver energy products and services to customers which are satisfied over time as energy is delivered or services are provided. Our nonregulated energy revenue primarily relates to our renewable energy business. Energy revenues are equivalent to the amounts we have the right to invoice and correspond directly with the value to the customer of the performance to date and include billed and unbilled amounts. As of September 30, 2018 and December 31, 2017, trade receivables were approximately $2.2 billion and $2.0 billion, respectively, and were included in other assets of our railroad, utilities and energy businesses on the Consolidated Balance Sheets. Such amounts substantially relate to customer revenue and included unbilled revenue of $624 million as of September 30, 2018 and $665 million as of December 31, 2017. Payments from customers are generally due from the customer within 30 days of billing. Rates charged for energy products and services are established by regulators or contractual arrangements that establish the transaction price, as well as the allocation of price amongst the separate performance obligations. When preliminary regulated rates are permitted to be billed prior to final approval by the applicable regulator, certain revenue collected may be subject to refund and a liability for estimated refunds is accrued.

The primary performance obligation under our freight rail transportation service contracts is to move freight from a point of origin to a point of destination. The performance obligations are represented by bills of lading which create a series of distinct services that have a similar pattern of transfer to the customer. The revenues for each performance obligation are based on various factors including the product being shipped, the origin and destination pair, and contract incentives which are outlined in various private rate agreements, common carrier public tariffs, interline foreign road agreements and pricing quotes. The transaction price is generally a per car amount to transport railcars from a specified origin to a specified destination. Freight revenues are recognized over time as the service is performed because the customer simultaneously receives and consumes the benefits of the service. Revenues recognized represent the proportion of the service completed as of the balance sheet date. Receivables related to customer contracts were approximately $1.3 billion at September 30, 2018 and $1.2 billion at December 31, 2017 and were included in other assets of our railroad, utilities and energy businesses. Invoices for freight transportation services are generally issued to customers and paid within thirty days or less. Customer incentives, which are primarily provided for shipping a specified cumulative volume or shipping to/from specific locations, are recorded as a reduction to revenue on a pro-rata basis based on actual or projected future customer shipments.

Other service revenues derive from contracts with customers in which performance obligations are satisfied over time, where customers receive and consume benefits as we perform the services, or at a point in time when the services are provided. Other service revenues primarily derive from real estate brokerage, automotive repair, aircraft management, aviation training, franchising and news distribution services.

9

Notes to Consolidated Financial Statements (Continued)

Note 3. Revenues from contracts with customers (Continued)

The following table summarizes customer contract revenues disaggregated by reportable segment and the source of the revenue for the three and nine months ending September 30, 2018 (in millions). Other revenues included in our consolidated revenues were primarily insurance premiums earned, interest, dividend and other investment income and lease income which are not within the scope of ASC 606.

	Manufacturing		McLane     Company		Service and Retail		BNSF		Berkshire Hathaway Energy		Finance and Financial Products		Insurance, Corporate and other		Total
Three months ending September 30, 2018
Manufactured products:
Industrial and commercial products	$	6,384	$	—	$	47	$	—	$	—	$	82	$	—	$	6,513
Building products		3,473		—		—		—		—		4		—		3,477
Consumer products		2,838		—		—		—		—		1,170		—		4,008
Grocery and convenience store distribution		—		8,709		—		—		—		—		—		8,709
Food and beverage distribution		—		4,079		—		—		—		—		—		4,079
Auto sales		—		—		2,083		—		—		—		—		2,083
Other retail and wholesale distribution		521		—		3,117		—		—		23		—		3,661
Service		262		16		965		6,099		1,140		148		—		8,630
Electricity and natural gas		—		—		—		—		4,267		—		—		4,267
Total		13,478		12,804		6,212		6,099		5,407		1,427		—		45,427
Other revenue		51		18		743		13		299		1,004		15,895		18,023
	$	13,529	$	12,822	$	6,955	$	6,112	$	5,706	$	2,431	$	15,895	$	63,450
	Manufacturing		McLane Company		Service and Retail		BNSF		Berkshire Hathaway Energy		Finance and Financial Products		Insurance, Corporate and other		Total
Nine months ending September 30, 2018
Manufactured products:
Industrial and commercial products	$	19,306	$	—	$	155	$	—	$	—	$	503	$	—	$	19,964
Building products		9,817		—		—		—		—		11		—		9,828
Consumer products		8,734		—		—		—		—		3,124		—		11,858
Grocery and convenience store distribution		—		25,128		—		—		—		—		—		25,128
Food and beverage distribution		—		12,203		—		—		—		—		—		12,203
Auto sales		—		—		6,087		—		—		—		—		6,087
Other retail and wholesale distribution		1,533		—		8,734		—		—		65		—		10,332
Service		759		53		2,912		17,510		3,026		174		—		24,434
Electricity and natural gas		—		—		—		—		11,357		—		—		11,357
Total		40,149		37,384		17,888		17,510		14,383		3,877		—		131,191
Other revenue		132		54		2,664		37		885		2,980		46,180		52,932
	$	40,281	$	37,438	$	20,552	$	17,547	$	15,268	$	6,857	$	46,180	$	184,123

A summary of the transaction price allocated to the significant unsatisfied remaining performance obligations relating to contracts with expected durations in excess of one year as of September 30, 2018 follows (in millions).

	Performance obligations     expected to be satisfied:
	Less than 12 months		Greater than 12 months		Total
Manufactured products:
Industrial and commercial products	$	50	$	2,549	$	2,599
Electricity and natural gas		1,011		5,879		6,890

10

Notes to Consolidated Financial Statements (Continued)

Note 4. Investments in fixed maturity securities

Our investments in fixed maturity securities as of September 30, 2018 and December 31, 2017 are summarized by type below (in millions).

	Amortized   Cost		Unrealized Gains		Unrealized Losses		Fair     Value
September 30, 2018
U.S. Treasury, U.S. government corporations and agencies	$	3,626	$	8	$	(35)	$	3,599
U.S. states, municipalities and political subdivisions		276		15		(1)		290
Foreign governments		7,362		45		(37)		7,370
Corporate bonds		6,029		436		(7)		6,458
Mortgage-backed securities		502		56		(4)		554
	$	17,795	$	560	$	(84)	$	18,271
December 31, 2017
U.S. Treasury, U.S. government corporations and agencies	$	3,975	$	4	$	(26)	$	3,953
U.S. states, municipalities and political subdivisions		847		19		(12)		854
Foreign governments		8,572		274		(24)		8,822
Corporate bonds		6,279		588		(5)		6,862
Mortgage-backed securities		772		92		(2)		862
	$	20,445	$	977	$	(69)	$	21,353

Investments in foreign government securities include securities issued by national and provincial government entities as well as instruments that are unconditionally guaranteed by such entities. As of September 30, 2018, approximately 89% of foreign government holdings were rated AA or higher by at least one of the major rating agencies.

The amortized cost and estimated fair value of fixed maturity securities at September 30, 2018 are summarized below by contractual maturity dates. Amounts are in millions. Actual maturities may differ from contractual maturities due to early call or prepayment rights held by issuers.

	Due in one   year or less		Due after one year through five years		Due after five years through ten years		Due after     ten years		Mortgage- backed     securities		Total
Amortized cost	$	7,275	$	9,057	$	387	$	574	$	502	$	17,795
Fair value		7,274		9,108		435		900		554		18,271

Note 5. Investments in equity securities

Our investments in equity securities as of September 30, 2018 and December 31, 2017 are summarized based on the primary industry of the investee as follows (in millions).

	Cost Basis		Net Unrealized Gains		Fair     Value
September 30, 2018 *
Banks, insurance and finance	$	42,010	$	51,499	$	93,509
Consumer products		38,793		39,858		78,651
Commercial, industrial and other		21,035		14,137		35,172
	$	101,838	$	105,494	$	207,332

* Approximately 69% of the aggregate fair value was concentrated in five companies (American Express Company – $16.1 billion; Apple Inc. – $57.6 billion; Bank of America Corporation – $26.5 billion; The Coca-Cola Company – $18.5 billion and Wells Fargo & Company – $24.4 billion).

11

Notes to Consolidated Financial Statements (Continued)

Note 5. Investments in equity securities (Continued)

	Cost Basis		Net Unrealized Gains		Fair         Value
December 31, 2017 *
Banks, insurance and finance	$	25,783	$	55,026	$	80,809
Consumer products		25,177		25,698		50,875
Commercial, industrial and other		23,716		15,140		38,856
	$	74,676	$	95,864	$	170,540

* Approximately 65% of the aggregate fair value was concentrated in five companies (American Express Company – $15.1 billion; Apple Inc. – $28.2 billion; Bank of America Corporation – $20.7 billion; The Coca-Cola Company – $18.4 billion and Wells Fargo & Company – $29.3 billion).

Investments in equity securities are reflected in our Consolidated Balance Sheets as follows (in millions).

	September 30,     2018		December 31,     2017
Insurance and other	$	201,226	$	164,026
Railroad, utilities and energy *		1,616		1,961
Finance and financial products *		4,490		4,553
	$	207,332	$	170,540

* Included in other assets.

Note 6. Equity Method Investments

Berkshire holds investments in certain businesses that are accounted for pursuant to the equity method. Currently, the most significant of these is our investment in the common stock of The Kraft Heinz Company (“Kraft Heinz”). Kraft Heinz is one of the world’s largest manufacturers and marketers of food and beverage products, including condiments and sauces, cheese and dairy, meals, meats, refreshment beverages, coffee and other grocery products. Berkshire currently owns 325,442,152 shares of Kraft Heinz common stock representing 26.7% of the outstanding shares. The carrying value and fair value of this investment at September 30, 2018 was approximately $17.5 billion and $17.9 billion, respectively, and at December 31, 2017 was $17.6 billion and $25.3 billion, respectively. Our earnings determined under the equity method during the first nine months of 2018 and 2017 were $635 million and $800 million, respectively. We received dividends on the common stock of $610 million in the first nine months of 2018 and $594 million in the first nine months of 2017, which we recorded as reductions of our investment.

Summarized consolidated financial information of Kraft Heinz follows (in millions).

					September 29,   2018		December 30,   2017
Assets					$	119,730	$	120,232
Liabilities						54,152		53,985
	Third Quarter				First Nine Months
	2018		2017		2018		2017
Sales	$	6,378	$	6,280	$	19,368	$	19,241
Net earnings attributable to Kraft Heinz common shareholders	$	630	$	944	$	2,379	$	2,996

Other investments accounted for pursuant to the equity method include our investments in Berkadia Commercial Mortgage LLC (“Berkadia”), Pilot Travel Centers LLC, d/b/a Pilot Flying J (“Pilot Flying J”), and Electric Transmission Texas, LLC (“ETT”). Our investments in these entities were approximately $3.6 billion as of September 30, 2018 and $3.4 billion as of December 31, 2017 and were included in other assets. Our equity method earnings in these entities for the first nine months were $409 million in 2018 and $132 million in 2017. Additional information concerning these investments follows.

12

Notes to Consolidated Financial Statements (Continued)

Note 6. Equity Method Investments (Continued)

We own a 50% interest in Berkadia with Jefferies Financial Group Inc. (“Jefferies”), formerly known as Leucadia National Corporation, owning the other 50% interest. Berkadia is a servicer of commercial real estate loans in the U.S., performing primary, master and special servicing functions for U.S. government agency programs, commercial mortgage-backed securities transactions, banks, insurance companies and other financial institutions. A source of funding for Berkadia’s operations is through its issuance of commercial paper, which is currently limited to $1.5 billion. The commercial paper is supported by a surety policy issued by a Berkshire insurance subsidiary. Jefferies is obligated to indemnify us for one-half of any losses incurred under the policy. In addition, a Berkshire Hathaway Energy Company subsidiary owns a 50% interest in ETT, an owner and operator of electric transmission assets in the Electric Reliability Council of Texas footprint. American Electric Power owns the other 50% interest.

On October 3, 2017, we entered into an investment agreement and an equity purchase agreement whereby we acquired a 38.6% interest in Pilot Flying J, headquartered in Knoxville, Tennessee. Pilot Flying J is one of the largest operators of travel centers in North America, with more than 28,000 team members, 750 locations across the U.S. and Canada and more than $20 billion in annual revenues. The Haslam family currently owns a 50.1% interest in Pilot Flying J and a third party owns the remaining 11.3% interest. We also entered into an agreement to acquire in 2023 an additional 41.4% interest in Pilot Flying J with the Haslam family retaining a 20% interest. As a result, Berkshire will become the majority owner of Pilot Flying J in 2023.

Note 7. Income taxes

Our consolidated effective income tax rates for the third quarter and first nine months of 2018 were 19.2% and 19.1%, respectively, and 25.3% and 27.2% in the third quarter and first nine months of 2017, respectively. Our effective income tax rate normally reflects recurring benefits from: (a) dividends received deductions applicable to certain investments in equity securities and (b) income production tax credits related to wind-powered electricity generation placed in service in the U.S. In 2018, our effective income tax rate reflects the current U.S. statutory rate of 21%, while the rate for 2017 reflects the then current U.S. statutory rate of 35%. The relative mix of pre-tax earnings or losses and underlying income tax rates applicable to the various taxing jurisdictions can also affect our periodic consolidated effective income tax rate.

In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin 118 (“SAB 118”) to provide clarification in implementing the Tax Cuts and Jobs Act of 2017 (“TCJA”) when registrants do not have the necessary information available to complete the accounting for an element of the TCJA in the period of its enactment. SAB 118 provides for tax amounts to be classified as provisional and subject to remeasurement for up to one year from the enactment date for such elements when the accounting effect is not complete, but can be reasonably estimated. We recorded income tax expense of approximately $1.4 billion in the fourth quarter of 2017, representing our provisional estimate of the U.S. Federal and state income taxes on the deemed repatriation of accumulated undistributed earnings of foreign subsidiaries. We continue to consider this estimate to be provisional and subject to remeasurement when we obtain the necessary additional information to complete the measurement. As of September 30, 2018, we had not finalized the inputs to the foreign earnings and profits calculations, the basis on which income taxes are determined. Our accounting for the repatriation tax under the TCJA will be completed during the fourth quarter of 2018. We do not anticipate significant adjustments to the provisional estimates.

Note 8. Investment gains/losses

A summary of investment gains and losses in the third quarter and first nine months of 2018 and 2017 follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Equity securities:
Unrealized investment gains/losses on securities held at the end of the period	$	14,294	$	—	$	12,126	$	—
Investment gains/losses during 2018 on securities sold in 2018		244		—		307		—
Gross realized gains		—		1,011		—		1,795
Gross realized losses		—		(419)		—		(626)
		14,538		592		12,433		1,169
Fixed maturity securities:
Gross realized gains		44		56		451		82
Gross realized losses		(10)		(2)		(152)		(16)
Other		(3)		11		18		27
	$	14,569	$	657	$	12,750	$	1,262

13

Notes to Consolidated Financial Statements (Continued)

Note 8. Investment gains/losses (Continued)

Prior to 2018, we recognized investment gains and losses in earnings when we sold or otherwise disposed of equity securities based on the difference between the proceeds from the sale and the cost of the securities and also when we recognized other-than-temporary impairment losses. Beginning in 2018, equity securities gains and losses include unrealized gains and losses from changes in fair values during the period on equity securities we still own. Prior to 2018, we recorded the changes in unrealized gains and losses on our investments in equity securities in other comprehensive income. See Note 2.

During the first nine months of 2018, as reflected on the Consolidated Statement of Cash Flows, we received proceeds of approximately $14.2 billion from sales of equity securities. In the table above, investment gains/losses on equity securities sold during 2018 reflect the difference between proceeds from sales and the fair value of the equity security sold at the beginning of the period or the purchase date, if later. Our taxable gains on equity securities sold during the third quarter and first nine months of 2018, which are generally the difference between the proceeds from sales and our original cost, were $1,329 million and $2,688 million, respectively.

Note 9. Receivables

Receivables of insurance and other businesses are comprised of the following (in millions).

	September 30, 2018		December 31, 2017
Insurance premiums receivable	$	13,002	$	11,058
Reinsurance recoverable on unpaid losses		2,944		3,201
Trade receivables		13,197		11,756
Other		3,121		2,925
Allowances for uncollectible accounts		(380)		(362)
	$	31,884	$	28,578

A summary of loans and finance receivables of our finance and financial products businesses follows (in millions).

	September 30, 2018		December 31, 2017
Loans and finance receivables before allowances and discounts	$	14,832	$	14,126
Allowances for uncollectible loans		(183)		(180)
Unamortized acquisition discounts		(172)		(198)
	$	14,477	$	13,748

Loans and finance receivables are predominantly installment loans originated or acquired by our manufactured housing business. Provisions for loan losses in the first nine months of 2018 and 2017 were $109 million and $124 million, respectively. Loan charge-offs, net of recoveries, in the first nine months were $106 million in 2018 and $126 million in 2017. At September 30, 2018, we evaluated approximately 98% of the loan balances collectively for impairment. As part of the evaluation process, credit quality indicators were reviewed and loans were designated as performing or non-performing. At September 30, 2018, we considered approximately 99% of the loan balances to be performing and approximately 95% of the loan balances to be current as to payment status.

Note 10. Inventories

Inventories are comprised of the following (in millions).

	September 30, 2018		December 31, 2017
Raw materials	$	3,326	$	2,997
Work in process and other		2,232		2,315
Finished manufactured goods		4,150		4,179
Goods acquired for resale		7,085		6,696
	$	16,793	$	16,187

14

Notes to Consolidated Financial Statements (Continued)

Note 11. Property, plant and equipment and assets held for lease

A summary of property, plant and equipment of our insurance and other businesses follows (in millions).

	September 30, 2018		December 31, 2017
Land	$	2,272	$	2,292
Buildings and improvements		9,034		8,810
Machinery and equipment		28,594		21,935
Furniture, fixtures and other		4,972		4,387
		44,872		37,424
Accumulated depreciation		(20,515)		(17,320)
	$	24,357	$	20,104

In conjunction with the adoption of ASC 606, we recorded a net asset of approximately $3.5 billion related to aircraft sold under fractional aircraft ownership programs in machinery and equipment. Such amount included cost of approximately $5.3 billion, net of accumulated depreciation of $1.8 billion. We also recorded other liabilities of approximately $3.5 billion for estimated aircraft repurchase obligations and unearned lease revenues, substantially offsetting the amount recorded in machinery and equipment. See Note 2.

A summary of property, plant and equipment of our railroad and our utilities and energy businesses follows (in millions). The utility generation, transmission and distribution systems and interstate natural gas pipeline assets are owned by regulated public utility and natural gas pipeline subsidiaries.

	September 30, 2018		December 31, 2017
Railroad:
Land, track structure and other roadway	$	58,755	$	57,408
Locomotives, freight cars and other equipment		12,731		12,543
Construction in progress		910		989
		72,396		70,940
Accumulated depreciation		(9,596)		(8,627)
		62,800		62,313
Utilities and energy:
Utility generation, transmission and distribution systems		75,751		74,660
Interstate natural gas pipeline assets		7,295		7,176
Independent power plants and other assets		8,156		7,499
Construction in progress		3,724		2,556
		94,926		91,891
Accumulated depreciation		(27,339)		(26,020)
		67,587		65,871
	$	130,387	$	128,184

15

Notes to Consolidated Financial Statements (Continued)

Note 11. Property, plant and equipment and assets held for lease (Continued)

Assets held for lease and property, plant and equipment of our finance and financial products businesses are summarized below (in millions). Assets held for lease include railcars, intermodal tank containers, cranes, over-the-road trailers, storage units and furniture.

	September 30, 2018		December 31, 2017
Assets held for lease	$	12,736	$	12,318
Land		240		231
Buildings, machinery and other		1,527		1,444
		14,503		13,993
Accumulated depreciation		(4,230)		(4,062)
	$	10,273	$	9,931

A summary of depreciation expense for the first nine months of 2018 and 2017 follows (in millions).

	First Nine Months
	2018		2017
Insurance and other	$	1,954	$	1,636
Railroad, utilities and energy		3,678		3,604
Finance and financial products		485		487
	$	6,117	$	5,727

Note 12. Goodwill and other intangible assets

A reconciliation of the change in the carrying value of goodwill is as follows (in millions).

	September 30, 2018		December 31, 2017
Balance at beginning of year	$	81,258	$	79,486
Acquisitions of businesses		250		1,545
Other, including foreign currency translation		(181)		227
Balance at end of period	$	81,327	$	81,258

Other intangible assets are summarized as follows (in millions).

	September 30, 2018				December 31, 2017
	Gross carrying amount		Accumulated   amortization		Gross carrying amount		Accumulated   amortization
Insurance and other	$	40,288	$	8,662	$	40,225	$	7,707
Railroad, utilities and energy		1,026		362		988		324
	$	41,314	$	9,024	$	41,213	$	8,031
Trademarks and trade names	$	5,396	$	744	$	5,381	$	692
Patents and technology		4,408		2,716		4,341		2,493
Customer relationships		28,343		4,351		28,322		3,722
Other		3,167		1,213		3,169		1,124
	$	41,314	$	9,024	$	41,213	$	8,031

Amortization expense in the first nine months was $1,052 million in 2018 and $1,108 million in 2017. Intangible assets with indefinite lives were approximately $18.9 billion as of September 30, 2018 and December 31, 2017.

16

Notes to Consolidated Financial Statements (Continued)

Note 13. Derivative contracts

We are party to derivative contracts primarily through our finance and financial products and our utilities and energy businesses. Currently, the derivative contracts of our finance and financial products businesses consist of equity index put option contracts written between 2004 and 2008. The liabilities and related notional values of such contracts follows (in millions).

	September 30, 2018				December 31, 2017
	Liabilities		Notional       Value		Liabilities		Notional       Value
Equity index put options	$	1,869	$	27,434(1)	$	2,172	$	28,753 (1)

⁽¹⁾  Represents the aggregate undiscounted amounts payable assuming that the value of each index is zero at each contract’s expiration date. Certain of these contracts are denominated in foreign currencies. Notional amounts are based on the foreign currency exchange rates as of each balance sheet date.

We record equity index put option contract liabilities at fair value and include the changes in the fair values of such contracts in earnings as derivative contract gains/losses. A summary of derivative contract gains/losses included in our Consolidated Statements of Earnings follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Equity index put options	$	137	$	308	$	303	$	703

The equity index put option contracts are European style options written prior to March 2008 on four major equity indexes. The remaining contracts expire between April 2019 and January 2026. At September 30, 2018, the remaining weighted average life of all contracts was approximately 2.25 years. In the second quarter of 2018, one equity index put option contract expired with no payment to the counterparty.

Future payments, if any, under any given contract will be required if the prevailing index value is below the contract strike price at the expiration date. We received aggregate premiums of approximately $4.1 billion on the remaining contracts at the contract inception dates and we have no counterparty credit risk. The aggregate intrinsic value (the undiscounted liability assuming the contracts are settled based on the index values and foreign currency exchange rates as of the balance sheet date) was $919 million at September 30, 2018 and $789 million at December 31, 2017. These contracts may not be unilaterally terminated or fully settled before the expiration dates and the ultimate amount of cash basis gains or losses on these contracts will not be determined until the contract expiration dates.

A limited number of our equity index put option contracts contain collateral posting requirements with respect to changes in the fair value or intrinsic value of the contracts and/or a downgrade of Berkshire’s credit ratings. As of September 30, 2018, we did not have any collateral posting requirements. If Berkshire’s credit ratings (currently AA from Standard & Poor’s and Aa2 from Moody’s) are downgraded below either A- by Standard & Poor’s or A3 by Moody’s, collateral of up to $1.1 billion could be required to be posted.

Our regulated utility subsidiaries are exposed to variations in the prices of fuel required to generate electricity, wholesale electricity purchased and sold and natural gas supplied for customers. We may use forward purchases and sales, futures, swaps and options to manage a portion of these price risks. Most of the net derivative contract assets or liabilities of our regulated utilities are probable of recovery through rates and are offset by regulatory liabilities or assets. Derivative contract assets are included in other assets and were $154 million as of September 30, 2018 and $142 million as of December 31, 2017. Derivative contract liabilities are included in other liabilities and were $80 million as of September 30, 2018 and $82 million as of December 31, 2017.

17

Notes to Consolidated Financial Statements (Continued)

Note 14. Supplemental cash flow information

Supplemental cash flow information follows (in millions).

	First Nine Months
	2018		2017
Cash paid during the period for:
Income taxes	$	3,977	$	1,774
Interest:
Insurance and other businesses		677		747
Railroad, utilities and energy businesses		2,129		2,111
Finance and financial products businesses		257		296
Non-cash investing and financing activities:
Liabilities assumed in connection with business acquisitions		93		685
Equity securities surrendered in connection with warrant exercise		—		4,965

Note 15. Unpaid losses and loss adjustment expenses

Our liabilities for unpaid losses and loss adjustment expenses (also referred to as “claim liabilities”) under short-duration property and casualty insurance and reinsurance contracts are based upon estimates of the ultimate claim costs associated with claim occurrences as of the balance sheet date and include estimates for incurred-but-not-reported (“IBNR”) claims. Reconciliations of the changes in claim liabilities, excluding liabilities under retroactive reinsurance contracts (see Note 16), for the nine months ending September 30, 2018 and 2017 follow (in millions).

	2018		2017
Balances – beginning of year:
Gross liabilities	$	61,122	$	53,379
Reinsurance recoverable on unpaid losses		(3,201)		(3,338)
Net liabilities		57,921		50,041
Incurred losses and loss adjustment expenses:
Current accident year events		29,071		28,632
Prior accident years’ events		(1,566)		(461)
Total incurred losses and loss adjustment expenses		27,505		28,171
Paid losses and loss adjustment expenses:
Current accident year events		(12,474)		(11,539)
Prior accident years’ events		(11,516)		(9,952)
Total payments		(23,990)		(21,491)
Foreign currency translation adjustment		(117)		603
Balances – September 30:
Net liabilities		61,319		57,324
Reinsurance recoverable on unpaid losses		2,944		3,254
Gross liabilities	$	64,263	$	60,578

Incurred losses and loss adjustment expenses in the first nine months of 2018 and 2017 included net reductions of estimated ultimate claim liabilities for prior accident years of $1,566 million and $461 million, respectively. We reduced estimated ultimate claim liabilities for prior accident years related to primary insurance by $985 million in the first nine months of 2018 and $569 million in the first nine months of 2017, which included reductions of $478 million in 2018 and increases of $37 million in 2017 related to private passenger automobile insurance coverages. We also reduced estimated ultimate claim liabilities with respect to prior accident years for property and casualty reinsurance by $581 million in the first nine months of 2018, compared to an increase of $108 million in the first nine months of 2017.

18

Notes to Consolidated Financial Statements (Continued)

Note 16. Retroactive reinsurance contracts

Retroactive reinsurance policies provide indemnification of losses and loss adjustment expenses of short-duration insurance contracts with respect to underlying loss events that occurred prior to the contract inception date. Claims payments may commence immediately after the contract date or, if applicable, once a contractual retention amount has been reached. Reconciliations of the changes in estimated liabilities for retroactive reinsurance unpaid losses and loss adjustment expenses (“claim liabilities”) and related deferred charge reinsurance assumed assets for the nine months ending September 30, 2018 and 2017 follows (in millions).

	2018				2017
	Unpaid losses and loss adjustment expenses		Deferred charges reinsurance assumed		Unpaid losses and loss adjustment expenses		Deferred charges reinsurance assumed
Balances – beginning of year:	$	42,937	$	(15,278)	$	24,972	$	(8,047)
Incurred losses and loss adjustment expenses
Current year contracts		—		—		17,213		(6,170)
Prior years’ contracts		(36)		827		(409)		645
Total		(36)		827		16,804		(5,525)
Paid losses and loss adjustment expenses		(966)		—		(783)		—
Balances – September 30:	$	41,935	$	(14,451)	$	40,993	$	(13,572)
Incurred losses and loss adjustment expenses, net of deferred charges	$	791			$	11,279

In the preceding table, classifications of incurred losses and loss adjustment expenses are based on the inception dates of the contracts. We do not believe that analysis of losses incurred and paid by accident year of the underlying event is relevant or meaningful given that our exposure to losses incepts when the contract incepts. Further, we believe the classifications of reported claims and case development liabilities has little or no practical analytical value.

In the first quarter of 2017, National Indemnity Company (“NICO”), a wholly-owned subsidiary, entered into an agreement with various subsidiaries of American International Group, Inc. (collectively, “AIG”), which became effective on February 2, 2017. Under this agreement, NICO agreed to indemnify AIG for 80% of up to $25 billion of losses and allocated loss adjustment expenses in excess of $25 billion retained by AIG with respect to certain commercial insurance loss events occurring prior to 2016. As of the effective date, we recorded premiums earned of $10.2 billion and losses incurred of $10.2 billion, which consisted of liabilities for unpaid losses and loss adjustment expenses of $16.4 billion and deferred charge reinsurance assumed assets of $6.2 billion. Berkshire agreed to guarantee the timely payment of all amounts due to AIG under the agreement. Our estimated ultimate claim liabilities with respect to the AIG contract at September 30, 2018 and at December 31, 2017 were $18.2 billion, which reflected an increase of $1.8 billion in estimated ultimate claim liabilities recorded in the fourth quarter of 2017. Deferred charge assets related to the AIG contract were approximately $7.1 billion at September 30, 2018 and $7.5 billion at December 31, 2017, which included an additional $1.7 billion arising from the aforementioned increase to ultimate claim liabilities in the fourth quarter.

Incurred losses and loss adjustment expenses related to contracts written in prior years were $791 million in the first nine months of 2018 and $236 million in the first nine months of 2017. Such losses included recurring amortization of deferred charge assets and net gains from reductions of estimated ultimate claim liabilities.

Note 17. Notes payable and other borrowings

Notes payable and other borrowings are summarized below (dollars in millions). The weighted average interest rates and maturity date ranges shown in the following tables are based on borrowings as of September 30, 2018.

	Weighted Average Interest Rate			September 30, 2018		December 31, 2017
Insurance and other:
Issued by Berkshire:
U.S. Dollar denominated borrowings due 2018-2047		3.1	%	$	9,058	$	10,603
Euro denominated borrowings due 2020-2035		1.1	%		7,897		8,164
Short-term subsidiary borrowings		4.1	%		1,733		1,832
Other subsidiary borrowings due 2018-2045		4.0	%		5,583		6,725
				$	24,271	$	27,324

19

Notes to Consolidated Financial Statements (Continued)

Note 17. Notes payable and other borrowings (Continued)

The carrying value of Berkshire’s Euro denominated senior notes reflects the Euro/U.S. Dollar exchange rate as of the balance sheet date. The gains or losses arising from the changes in the Euro/U.S. Dollar exchange rate during the period are recorded in earnings as a component of interest expense. The change in the Euro/U.S. Dollar exchange rate in the first nine months of 2018 resulted in reductions of $273 million in interest expense and to the carrying value of the Euro denominated senior notes compared to increases of $860 million in interest expense and to the carrying value of the notes in the first nine months of 2017.

	Weighted Average  Interest Rate		September 30,  2018		December 31,  2017
Railroad, utilities and energy:
Issued by Berkshire Hathaway Energy Company (“BHE”) and its subsidiaries:
BHE senior unsecured debt due 2018-2049		4.5%	$	8,970	$	6,452
Subsidiary and other debt due 2019-2064		4.7%		28,588		28,739
Short-term debt		3.0%		1,784		4,488
Issued by BNSF due 2018-2097		4.7%		23,257		22,499
			$	62,599	$	62,178

BHE subsidiary debt represents amounts issued pursuant to separate financing agreements. Substantially all of the assets of certain BHE subsidiaries are, or may be, pledged or encumbered to support or otherwise secure debt. These borrowing arrangements generally contain various covenants, which pertain to leverage ratios, interest coverage ratios and/or debt service coverage ratios, among other covenants. During the first nine months of 2018, BHE and its subsidiaries issued approximately $5.5 billion of long-term debt, including $2.05 billion in the third quarter. The debt issued in 2018 has maturity dates ranging from 2020 to 2049 and a weighted average interest rate of 3.6%. Proceeds from these debt issuances were used to repay debt, to fund capital expenditures and for general corporate purposes.

BNSF’s borrowings are primarily senior unsecured debentures. In the first nine months of 2018, BNSF issued $1.5 billion of senior unsecured debentures due in 2048, including $750 million in the third quarter. These debentures have a weighted average interest rate of 4.1%. In 2018, BNSF repaid $650 million of maturing debentures. As of September 30, 2018, BNSF, BHE and their subsidiaries were in compliance with all applicable debt covenants. Berkshire does not guarantee any debt, borrowings or lines of credit of BNSF, BHE or their subsidiaries.

	Weighted Average  Interest Rate		September 30,  2018		December 31,  2017
Finance and financial products:
Issued by Berkshire Hathaway Finance Corporation (“BHFC”) due 2019-2048		3.3%	$	10,649	$	12,926
Issued by other subsidiaries due 2018-2028		3.6%		121		159
			$	10,770	$	13,085

Borrowings of BHFC, a wholly owned finance subsidiary of Berkshire, consist of senior unsecured notes used to fund manufactured housing loans originated or acquired and assets held for lease of certain finance subsidiaries. In August 2018, BHFC issued $2.35 billion of 4.2% senior notes due in 2048. Such borrowings are fully and unconditionally guaranteed by Berkshire. During the first nine months of 2018, BHFC repaid $4.6 billion of maturing senior notes.

As of September 30, 2018, our subsidiaries had unused lines of credit and commercial paper capacity aggregating approximately $8.4 billion to support short-term borrowing programs and provide additional liquidity. Such unused lines of credit included approximately $6.8 billion related to BHE and its subsidiaries. In addition to BHFC’s borrowings, Berkshire guaranteed approximately $1.7 billion of other subsidiary borrowings at September 30, 2018. Generally, Berkshire’s guarantee of a subsidiary’s debt obligation is an absolute, unconditional and irrevocable guarantee for the full and prompt payment when due of all payment obligations.

20

Notes to Consolidated Financial Statements (Continued)

Note 18. Fair value measurements

Our financial assets and liabilities are summarized below as of September 30, 2018 and December 31, 2017 with fair values shown according to the fair value hierarchy (in millions). The carrying values of cash and cash equivalents, U.S. Treasury Bills, receivables and accounts payable, accruals and other liabilities are considered to be reasonable estimates of their fair values.

	Carrying     Value		Fair Value		Quoted Prices     (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2018
Investments in fixed maturity securities:
U.S. Treasury, U.S. government corporations and agencies	$	3,599	$	3,599	$	2,378	$	1,221	$	—
U.S. states, municipalities and political subdivisions		290		290		—		290		—
Foreign governments		7,370		7,370		5,162		2,208		—
Corporate bonds		6,458		6,458		—		6,453		5
Mortgage-backed securities		554		554		—		554		—
Investments in equity securities		207,332		207,332		206,985		47		300
Investment in Kraft Heinz common stock		17,453		17,935		17,935		—		—
Loans and finance receivables		14,477		14,735		—		59		14,676
Derivative contract assets (1)		154		154		3		41		110
Derivative contract liabilities:
Railroad, utilities and energy (1)		80		80		1		63		16
Equity index put options		1,869		1,869		—		—		1,869
Notes payable and other borrowings:
Insurance and other		24,271		24,422		—		24,422		—
Railroad, utilities and energy		62,599		66,823		—		66,823		—
Finance and financial products		10,770		10,979		—		10,953		26
December 31, 2017
Investments in fixed maturity securities:
U.S. Treasury, U.S. government corporations and agencies	$	3,953	$	3,953	$	2,360	$	1,593	$	—
U.S. states, municipalities and political subdivisions		854		854		—		854		—
Foreign governments		8,822		8,822		6,946		1,876		—
Corporate bonds		6,862		6,862		—		6,856		6
Mortgage-backed securities		862		862		—		862		—
Investments in equity securities		170,540		170,540		170,494		46		—
Investment in Kraft Heinz common stock		17,635		25,306		25,306		—		—
Loans and finance receivables		13,748		14,136		—		17		14,119
Derivative contract assets (1)		142		142		1		28		113
Derivative contract liabilities:
Railroad, utilities and energy (1)		82		82		3		69		10
Equity index put options		2,172		2,172		—		—		2,172
Notes payable and other borrowings:
Insurance and other		27,324		28,180		—		28,180		—
Railroad, utilities and energy		62,178		70,538		—		70,538		—
Finance and financial products		13,085		13,582		—		13,577		5

(1) Assets are included in other assets and liabilities are included in accounts payable, accruals and other liabilities.

21

Notes to Consolidated Financial Statements (Continued)

Note 18. Fair value measurements (Continued)

The fair values of substantially all of our financial instruments were measured using market or income approaches. The hierarchy for measuring fair value consists of Levels 1 through 3, which are described below.

Level 1 – Inputs represent unadjusted quoted prices for identical assets or liabilities exchanged in active markets.

Level 2 – Inputs include directly or indirectly observable inputs (other than Level 1 inputs), such as quoted prices for similar assets or liabilities exchanged in active or inactive markets or quoted prices for identical assets or liabilities exchanged in inactive markets. In addition, other inputs considered in fair value determinations may include interest rates and yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates, and inputs derived principally from or corroborated by observable market data by correlation or other means. Pricing evaluations generally reflect discounted expected future cash flows, which incorporate yield curves for instruments with similar characteristics, such as credit ratings, estimated durations and yields for other instruments of the issuer or entities in the same industry sector.

Level 3 – Inputs include unobservable inputs used in the measurement of assets and liabilities. Management is required to use its own assumptions regarding unobservable inputs because there is little, if any, market activity in the assets or liabilities and it may be unable to corroborate the related observable inputs. Unobservable inputs require management to make certain projections and assumptions about the information that would be used by market participants in valuing assets or liabilities.

Reconciliations of assets and liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) for the nine months ending September 30, 2018 and 2017 follow (in millions).

	Investments   in equity and fixed maturity securities		Net     derivative     contract liabilities
Nine months ending September 30, 2018
Balance at December 31, 2017	$	6	$	(2,069)
Gains (losses) included in:
Earnings		—		446
Regulatory assets and liabilities		—		(11)
Acquisitions, dispositions and settlements		(1)		(141)
Balance at September 30, 2018	$	5	$	(1,775)
Nine months ending September 30, 2017
Balance at December 31, 2016	$	17,321	$	(2,824)
Gains (losses) included in:
Earnings		—		822
Other comprehensive income		1,157		(3)
Regulatory assets and liabilities		—		(5)
Acquisitions, dispositions and settlements		(58)		(78)
Transfers into/out of Level 3		(18,413)		—
Balance at September 30, 2017	$	7	$	(2,088)

Gains and losses included in earnings are reported as components of investment gains/losses, derivative gains/losses and other revenues, as appropriate. In 2017, gains and losses included in other comprehensive income were primarily the net change in unrealized appreciation of investments and the reclassification of investment appreciation in net earnings in our Consolidated Statements of Comprehensive Income.

On June 30, 2017, we announced our intention to exercise our investment in Bank of America Corporation Warrants (“BAC Warrants”) for common stock in the third quarter of 2017 and that we expected to use our investment in Bank of America Corporation Preferred Stock as consideration. In the second quarter of 2017, Restaurant Brands International, Inc. (“RBI”) announced its intention to redeem our investment in RBI Preferred Shares in the fourth quarter of 2017. As of June 30, 2017, we based our valuations of these investments on such expectations and we significantly reduced expected durations and effectively eliminated the discounts for transferability and other restrictions. As a result, we concluded the Level 3 inputs used in the previous fair value determinations of our investments in BAC Warrants and RBI Preferred Shares were not significant and that the valuations of such investments were deemed Level 2 measurements.

22

Notes to Consolidated Financial Statements (Continued)

Note 18. Fair value measurements (Continued)

Quantitative information as of September 30, 2018, with respect to assets and liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) follows (in millions).

	Fair Value		Principal Valuation Techniques	Unobservable Inputs		Weighted   Average
Derivative contract liabilities – Equity index put options	$	1,869	Option pricing model		Volatility		16%

Our equity index put option contracts are illiquid and contain contract terms that are not standard in derivatives markets. For example, we are not required to post collateral under most of our contracts and certain of the contracts have relatively long durations. For these and other reasons, we classified these contracts as Level 3 measurements. The methods we use to measure fair values are those that we believe market participants would use in determining exchange prices with respect to our contracts.

We value equity index put option contracts based on the Black-Scholes option valuation model. Inputs to this model include index price, contract duration and dividend and interest rate inputs (including a Berkshire non-performance input) which are observable. However, we believe that the valuation of our longer duration contracts using any model is inherently subjective and, given the lack of observable transactions and prices, acceptable values may be subject to wide ranges. Volatility inputs represent our expectations, which consider the remaining duration of each contract and assume that the contracts will remain outstanding until the expiration dates. Increases or decreases in the volatility inputs will produce increases or decreases in the fair values of the liabilities.

Note 19. Common stock

Changes in Berkshire’s issued, treasury and outstanding common stock during the nine months ending September 30, 2018 are shown in the table below. In addition to our common stock, 1,000,000 shares of preferred stock are authorized, but none are issued.

	Class A, $5 Par Value         (1,650,000 shares authorized)						Class B, $0.0033 Par Value (3,225,000,000 shares authorized)
	Issued		Treasury		Outstanding		Issued		Treasury		Outstanding
Balance at December 31, 2017		762,755		(11,680)		751,075		1,342,066,749		(1,409,762)		1,340,656,987
Conversions of Class A common stock to Class B common stock and exercises of replacement stock options issued in a business acquisition		(16,850)		—		(16,850)		25,886,063		—		25,886,063
Treasury stock acquired		—		(225)		(225)		—		(4,139,192)		(4,139,192)
Balance at September 30, 2018		745,905		(11,905)		734,000		1,367,952,812		(5,548,954)		1,362,403,858

Each Class A common share is entitled to one vote per share. Class B common stock possesses dividend and distribution rights equal to one-fifteen-hundredth (1/1,500) of such rights of Class A common stock. Each Class B common share possesses voting rights equivalent to one-ten-thousandth (1/10,000) of the voting rights of a Class A share. Unless otherwise required under Delaware General Corporation Law, Class A and Class B common shares vote as a single class. Each share of Class A common stock is convertible, at the option of the holder, into 1,500 shares of Class B common stock. Class B common stock is not convertible into Class A common stock. On an equivalent Class A common stock basis, there were 1,642,269 shares outstanding as of September 30, 2018 and 1,644,846 shares outstanding as of December 31, 2017.

Since we have two classes of common stock, we provide earnings per share data on the Consolidated Statements of Earnings for average equivalent Class A shares outstanding and average equivalent Class B shares outstanding. Class B shares are economically equivalent to one-fifteen-hundredth (1/1,500) of a Class A share. Average equivalent Class A shares outstanding represents average Class A shares outstanding plus one-fifteen-hundredth (1/1,500) of the average Class B shares outstanding. Average equivalent Class B shares outstanding represents average Class B shares outstanding plus 1,500 times average Class A shares outstanding.

For several years, Berkshire had a common stock repurchase program, which permitted Berkshire to repurchase its Class A and Class B shares at prices no higher than a 20% premium over the book value of the shares. On July 17, 2018, Berkshire’s Board of Directors authorized an amendment to the program, permitting Berkshire to repurchase shares any time that Warren Buffett, Berkshire’s Chairman of the Board and Chief Executive Officer, and Charlie Munger, a Vice-Chairman of the Board, believe that the repurchase price is below Berkshire’s intrinsic value, conservatively determined. The program continues to allow share repurchases in the open market or through privately negotiated transactions and does not specify a maximum number of shares to be repurchased. However, repurchases will not be made if they would reduce the total value of Berkshire’s consolidated cash, cash equivalents and U.S. Treasury Bills holdings below $20 billion. The repurchase program does not obligate Berkshire to repurchase any specific dollar amount or number of Class A or Class B shares and there is no expiration date to the program.

23

Notes to Consolidated Financial Statements (Continued)

Note 20. Accumulated other comprehensive income

A summary of the net changes in after-tax accumulated other comprehensive income attributable to Berkshire Hathaway shareholders and amounts reclassified out of accumulated other comprehensive income for the nine months ending September 30, 2018 and 2017 follows (in millions).

	Unrealized appreciation of  investments, net		Foreign currency       translation		Prior service and actuarial gains/losses of defined benefit   pension plans		Other		Accumulated other  comprehensive  income
2018
Balance at December 31, 2017	$	62,093	$	(3,114)	$	(420)	$	12	$	58,571
Reclassifications to retained earnings upon adoption of new accounting standards		(61,340)		(65)		36		(6)		(61,375)
Other comprehensive income, net before reclassifications		(142)		(776)		(33)		(19)		(970)
Reclassifications into net earnings		(236)		—		76		7		(153)
Balance at September 30, 2018	$	375	$	(3,955)	$	(341)	$	(6)	$	(3,927)
Reclassifications into net earnings:
Reclassifications before income taxes	$	(299)	$	—	$	101	$	10	$	(188)
Applicable income taxes		(63)		—		25		3		(35)
	$	(236)	$	—	$	76	$	7	$	(153)
2017
Balance at December 31, 2016	$	43,176	$	(5,268)	$	(593)	$	(17)	$	37,298
Other comprehensive income, net before reclassifications		11,734		1,946		(90)		19		13,609
Reclassifications into net earnings		(803)		—		61		18		(724)
Balance at September 30, 2017	$	54,107	$	(3,322)	$	(622)	$	20	$	50,183
Reclassifications into net earnings:
Reclassifications before income taxes	$	(1,235)	$	—	$	82	$	32	$	(1,121)
Applicable income taxes		(432)		—		21		14		(397)
	$	(803)	$	—	$	61	$	18	$	(724)

Note 21. Contingencies and Subsequent Event

We are parties in a variety of legal actions that routinely arise out of the normal course of business, including legal actions seeking to establish liability directly through insurance contracts or indirectly through reinsurance contracts issued by Berkshire subsidiaries. Plaintiffs occasionally seek punitive or exemplary damages. We do not believe that such normal and routine litigation will have a material effect on our financial condition or results of operations. Berkshire and certain of its subsidiaries are also involved in other kinds of legal actions, some of which assert or may assert claims or seek to impose fines and penalties. We believe that any liability that may arise as a result of other pending legal actions will not have a material effect on our consolidated financial condition or results of operations.

In 2016, NICO entered into a definitive agreement to acquire Medical Liability Mutual Insurance Company, (“Medical Liability Mutual”), a writer of medical professional liability insurance domiciled in New York. The acquisition price was approximately $2.5 billion. The acquisition involved the conversion of Medical Liability Mutual from a mutual company to a stock company. The closing of the transaction was subject to various regulatory approvals, customary closing conditions and the approval of the Medical Liability Mutual policyholders eligible to vote on the proposed demutualization and sale. The acquisition closed on October 1, 2018, at which time, Medical Liability Mutual’s name was changed to the MLMIC Insurance Company (“MLMIC”). The results of MLMIC will be included in Berkshire’s consolidated results beginning as of that date. As of the acquisition date, the preliminary fair values of MLMIC’s assets were approximately $6.3 billion, consisting primarily of cash and investments, and liabilities were approximately $3.8 billion, consisting primarily of unpaid losses and loss adjustment expenses and unearned insurance premiums. We believe goodwill arising from this acquisition will be insignificant. MLMIC’s premiums earned for the first nine months of 2018 were approximately $300 million.

24

Notes to Consolidated Financial Statements (Continued)

Note 22. Business segment data

Our operating businesses include a large and diverse group of insurance, railroad, utilities and energy, finance, manufacturing, service and retailing businesses. Our reportable business segments are organized in a manner that reflects how management views those business activities. Certain businesses have been grouped together for segment reporting based upon similar products or product lines, marketing, selling and distribution characteristics, even though those business units are operated under separate local management. Revenues by segment for the third quarter and first nine months of 2018 and 2017 were as follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Operating Businesses:
Insurance:
Underwriting:
GEICO	$	8,506	$	7,543	$	24,705	$	21,632
Berkshire Hathaway Reinsurance Group		3,777		3,954		11,229		20,550
Berkshire Hathaway Primary Group		2,050		1,852		5,921		5,287
Investment income		1,446		1,248		4,058		3,664
Total insurance		15,779		14,597		45,913		51,133
BNSF		6,147		5,314		17,649		15,749
Berkshire Hathaway Energy		5,706		5,351		15,268		14,184
Manufacturing		13,552		12,819		40,339		37,654
McLane Company		12,822		12,798		37,438		37,480
Service and retailing		6,974		6,527		20,623		19,170
Finance and financial products		2,432		2,153		6,861		6,019
		63,412		59,559		184,091		181,389
Reconciliation of segments to consolidated amount:
Corporate, eliminations and other		38		(52)		32		(256)
	$	63,450	$	59,507	$	184,123	$	181,133

Earnings before income taxes by segment for the third quarter and first nine months of 2018 and 2017 were as follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Operating Businesses:
Insurance:
Underwriting:
GEICO	$	627	$	(416)	$	1,977	$	(122)
Berkshire Hathaway Reinsurance Group		(163)		(1,845)		(124)		(2,963)
Berkshire Hathaway Primary Group		135		52		468		473
Investment income		1,455		1,246		4,052		3,658
Total insurance		2,054		(963)		6,373		1,046
BNSF		1,879		1,710		5,047		4,592
Berkshire Hathaway Energy		1,165		1,243		2,238		2,481
Manufacturing		2,012		2,002		6,002		5,428
McLane Company		44		45		171		202
Service and retailing		628		491		1,840		1,439
Finance and financial products		530		496		1,589		1,438
		8,312		5,024		23,260		16,626
Reconciliation of segments to consolidated amount:
Investment and derivative contract gains/losses		14,706		965		13,053		1,965
Interest expense, not allocated to segments		(60)		(386)		(77)		(1,243)
Equity method investments		316		305		1,044		932
Corporate, eliminations and other		(127)		(278)		(558)		(833)
	$	23,147	$	5,630	$	36,722	$	17,447

25

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Results of Operations

Net earnings attributable to Berkshire Hathaway shareholders are disaggregated in the table that follows. Amounts are after deducting income taxes and exclude earnings attributable to noncontrolling interests (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Insurance – underwriting	$	441	$	(1,439)	$	1,791	$	(1,728)
Insurance – investment income		1,239		1,044		3,393		2,917
Railroad		1,393		1,042		3,847		2,838
Utilities and energy		1,091		952		2,257		1,941
Manufacturing, service and retailing		2,097		1,694		6,060		4,673
Finance and financial products		390		319		1,193		933
Investment and derivative gains/losses		11,660		623		10,352		1,270
Other		229		(168)		520		(455)
Net earnings attributable to Berkshire Hathaway shareholders	$	18,540	$	4,067	$	29,413	$	12,389

Through our subsidiaries, we engage in a number of diverse business activities. We manage our operating businesses on an unusually decentralized basis. There are essentially no centralized or integrated business functions and there is minimal involvement by our corporate headquarters in the day-to-day business activities of the operating businesses. Our senior corporate management team participates in and is ultimately responsible for significant capital allocation decisions, investment activities and the selection of the Chief Executive to head each of the operating businesses. Beginning in 2018, our periodic net earnings include changes in unrealized gains and losses on our investments in equity securities. These gains and losses are likely to be very significant given the size of our current holdings and the inherent volatility in securities prices. Prior to 2018, changes in unrealized gains and losses were recorded in other comprehensive income. Thus, the new accounting treatment has no effect on consolidated shareholders’ equity. The business segment data (Note 22 to the accompanying Consolidated Financial Statements) should be read in conjunction with this discussion.

Our after-tax earnings in the third quarter and first nine months of 2018 were favorably affected by lower U.S. income tax expense, primarily attributable to a reduction in the U.S. statutory income tax rate from 35% to 21% effective January 1, 2018 in connection with the Tax Cuts and Jobs Act of 2017 (“TCJA”) enacted on December 22, 2017. The effect of the lower U.S. statutory income tax rate in 2018 generally resulted in increased comparative after-tax earnings of our various business operations, although the effects varied, reflecting the differences in the mix of earnings subject to income tax, income tax credits and the varying effects of state and local income taxes.

Our insurance businesses generated after-tax earnings from underwriting of $441 million and $1.8 billion in the third quarter and first nine months of 2018, respectively, compared to losses of $1.4 billion and $1.7 billion, respectively, in the corresponding 2017 periods. Results in 2018 included reductions of estimated ultimate liabilities for prior years’ property/casualty loss events, gains from foreign currency exchange rate changes on certain non-U.S. Dollar denominated liabilities of U.S subsidiaries and a lower effective income tax rate. Underwriting results in the third quarter of 2017 included estimated pre-tax losses of approximately $3.0 billion ($1.95 billion after-tax) attributable to three major hurricanes in the U.S. and Puerto Rico and an earthquake in Mexico. Underwriting results in 2017 also included foreign currency exchange rate losses from the revaluation of certain non-U.S. Dollar denominated liabilities.

Our railroad business generated increased after-tax earnings in the third quarter and first nine months of 2018 compared to 2017, reflecting an increase in unit volume, higher average revenue per car/unit and a lower effective income tax rate, partly offset by increased fuel and other operating costs. Our utilities and energy businesses produced higher after-tax earnings in the third quarter and first nine months of 2018 compared to 2017, primarily due to a lower overall effective income tax rate and increased pre-tax earnings from renewables and natural gas pipelines. After-tax earnings from our manufacturing, service and retailing businesses in the third quarter and first nine months of 2018 increased 24% and 30%, respectively, over 2017, due to lower effective income tax rates and a 13% increase in year-to-date pre-tax earnings.

After-tax gains in the third quarter and first nine months of 2018 from investments and derivative contracts were $11.7 billion and $10.4 billion, respectively. Investment gains/losses included after-tax gains of approximately $11.4 billion in the third quarter and $9.6 billion in the first nine months from changes in market values of our investments in equity securities held at September 30, 2018. In 2017, after-tax investment gains on equity securities arose from the disposition or exchange of securities during the period based on the cost of the disposed security. In the first nine months of 2017, we recorded after-tax unrealized gains on our investments in equity securities of approximately $10.9 billion in other comprehensive income. We believe that investment and derivative gains/losses, whether realized from dispositions or unrealized from changes in market prices of equity securities, are generally meaningless in understanding our reported results or evaluating the economic performance of our businesses. These gains and losses have caused and will continue to cause significant volatility in our periodic earnings.

26

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Insurance—Underwriting

We engage in both primary insurance and reinsurance of property/casualty, life and health risks. In primary insurance activities, we assume defined portions of the risks of loss from persons or organizations that are directly subject to the risks. In reinsurance activities, we assume defined portions of similar or dissimilar risks that other insurers or reinsurers have subjected themselves to in their own insuring activities. Our insurance and reinsurance businesses are GEICO, Berkshire Hathaway Reinsurance Group (“BHRG”) and Berkshire Hathaway Primary Group.

Our management views insurance businesses as possessing two distinct operations – underwriting and investing. Underwriting decisions are the responsibility of the unit managers, while investing decisions are the responsibility of Berkshire’s Chairman and CEO, Warren E. Buffett and Berkshire’s corporate investment managers. Accordingly, we evaluate performance of underwriting operations without any allocation of investment income or investment gains/losses. We consider investment income as a component of our aggregate insurance operating results. However, we consider investment gains and losses, whether realized or unrealized, as non-operating based on our long-held philosophy of acquiring securities and holding those securities for long periods. Accordingly, we believe that such gains and losses are not predictable or necessarily meaningful in understanding the operating results of our insurance businesses.

The timing and amount of catastrophe losses can produce significant volatility in our periodic underwriting results, particularly with respect to our reinsurance businesses. Generally, we consider catastrophe losses in excess of $100 million (pre-tax) from a current year event as significant. We incurred estimated pre-tax losses of $372 million from two significant catastrophe events in the third quarter of 2018. In the third quarter of 2017, we incurred pre-tax losses of approximately $3.0 billion from four significant catastrophe events. In October 2018, Hurricane Michael hit the Southeastern United States. Incurred losses in the fourth quarter from this event are currently estimated to be in the $350 million to $550 million range.

Changes in estimates for unpaid losses and loss adjustment expenses, including amounts established for occurrences in prior years, can also significantly affect our periodic underwriting results. Unpaid loss estimates, including estimates under retroactive reinsurance contracts, were approximately $106 billion as of September 30, 2018. Our periodic underwriting results may also include significant foreign currency transaction gains and losses arising from the changes in the valuation of non-U.S. Dollar denominated reinsurance liabilities of our U.S. based insurance subsidiaries due to foreign currency exchange rate fluctuations.

Underwriting results of our insurance businesses are summarized below (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Underwriting gain (loss):
GEICO	$	627	$	(416)	$	1,977	$	(122)
Berkshire Hathaway Reinsurance Group		(163)		(1,845)		(124)		(2,963)
Berkshire Hathaway Primary Group		135		52		468		473
Pre-tax underwriting gain (loss)		599		(2,209)		2,321		(2,612)
Income taxes and noncontrolling interests		158		(770)		530		(884)
Net underwriting gain (loss)	$	441	$	(1,439)	$	1,791	$	(1,728)
Effective income tax rate		25.9%		35.1%		22.6%		34.4%

GEICO

GEICO writes private passenger automobile insurance, offering coverages to insureds in all 50 states and the District of Columbia. GEICO markets its policies mainly by direct response methods where most customers apply for coverage directly to the company via the Internet or over the telephone. A summary of GEICO’s underwriting results follows (dollars in millions).

	Third Quarter								First Nine Months
	2018				2017				2018				2017
	Amount		%		Amount		%		Amount		%		Amount		%
Premiums written	$	8,952			$	8,130			$	25,878			$	22,987
Premiums earned	$	8,506		100.0	$	7,543		100.0	$	24,705		100.0	$	21,632		100.0
Losses and loss adjustment expenses		6,725		79.1		6,933		91.9		19,305		78.1		18,631		86.1
Underwriting expenses		1,154		13.5		1,026		13.6		3,423		13.9		3,123		14.5
Total losses and expenses		7,879		92.6		7,959		105.5		22,728		92.0		21,754		100.6
Pre-tax underwriting gain (loss)	$	627			$	(416)			$	1,977			$	(122)

27

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Insurance—Underwriting (Continued)

GEICO (Continued)

Premiums written in the third quarter and first nine months of 2018 were approximately $9.0 billion and $25.9 billion, respectively, representing increases of 10.1% and 12.6%, respectively, compared to 2017. These increases reflected increases in voluntary auto policies-in-force of 3.7% and premiums per auto policy of approximately 7.8% over the past twelve months. The increase in premiums per policy was attributable to rate increases, coverage changes and changes in state and risk mix. The rate increases were in response to accelerating claim costs in recent years. Although policies-in-force increased 461,000 during the first nine months of 2018, the rate of increase slowed, as voluntary auto new business sales decreased 6.6% compared to 2017.

Losses and loss adjustment expenses decreased $208 million (3.0%) in the third quarter and increased $674 million (3.6%) in the first nine months of 2018 compared to 2017. Our ratios of losses and loss adjustment expenses to premiums earned (the “loss ratio”) for the third quarter and first nine months of 2018 were 79.1% and 78.1%, respectively, declines of 12.8 and 8.0 percentage points compared to the third quarter and first nine months of 2017, respectively. In the third quarter of 2018, we recorded estimated losses of $30 million related to Hurricane Florence. In the third quarter of 2017, we incurred estimated losses related to Hurricanes Harvey and Irma of approximately $500 million (6.6% of premiums earned in the third quarter and 2.3% in the first nine months).

Our losses and loss adjustment expenses incurred in the first nine months of 2018 also included reductions of $478 million with respect to ultimate claim loss estimates for prior years’ loss events, which produced a corresponding increase in pre-tax underwriting gains. By comparison, we increased loss estimates for prior years’ events by $37 million in the first nine months of 2017. Claims frequencies in the first nine months of 2018 for property damage, collision, and bodily and personal injury protection coverages declined (two to three percent range) compared to 2017. Average claims severities in the first nine months of 2018 increased for property damage and collision coverages (four to six percent range) and bodily injury coverage (five to seven percent range).

Our underwriting expenses in the first nine months of 2018 were approximately $3.4 billion, an increase of $300 million (9.6%) over 2017. Our expense ratio (underwriting expenses to premiums earned) for the first nine months of 2018 decreased 0.6 percentage points compared to 2017. The increases in underwriting expenses were primarily attributable to increases in advertising expenses, insurance premium taxes and employee-related costs, which included wage and staffing increases.

Berkshire Hathaway Reinsurance Group

We offer excess-of-loss and quota-share reinsurance coverages on property and casualty risks and life and health reinsurance to insurers and reinsurers worldwide through several legal entities, led by National Indemnity Company (“NICO Group”), Berkshire Hathaway Life Insurance Company of Nebraska (“BHLN Group”), and General Reinsurance Corporation, General Reinsurance AG and General Re Life Corporation (collectively, “General Re Group”). We also periodically assume property and casualty risks under retroactive reinsurance contracts written through NICO. In addition, the BHLN Group writes periodic payment annuity contracts.

With the exception of our retroactive reinsurance and periodic payment annuity businesses, we strive to generate pre-tax underwriting profits. Time-value-of-money concepts are important elements in establishing prices for our retroactive reinsurance and periodic payment annuity businesses due to the expected long durations of the liabilities. We expect to incur pre-tax underwriting losses from such businesses, primarily through deferred charge amortization and discount accretion charges. We receive premiums at the inception of these contracts, which are then available for investment. A summary of the premiums and pre-tax underwriting results of our reinsurance business follows (in millions).

	Premiums earned								Pre-tax underwriting gain (loss)
	Third Quarter				First Nine Months				Third Quarter				First Nine Months
	2018		2017		2018		2017		2018		2017		2018		2017
Property/casualty	$	2,157	$	2,061	$	6,479	$	5,763	$	67	$	(1,486)	$	535	$	(1,856)
Retroactive reinsurance		1		550		1		10,736		(246)		(287)		(704)		(881)
		2,158		2,611		6,480		16,499		(179)		(1,773)		(169)		(2,737)
Life/health		1,307		1,146		3,855		3,404		108		113		324		302
Periodic payment annuity		312		197		894		647		(92)		(185)		(279)		(528)
		1,619		1,343		4,749		4,051		16		(72)		45		(226)
	$	3,777	$	3,954	$	11,229	$	20,550	$	(163)	$	(1,845)	$	(124)	$	(2,963)

28

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Insurance—Underwriting (Continued)

Property/casualty

A summary of premiums and underwriting results of our property/casualty reinsurance businesses follows (in millions).

	Premiums earned								Pre-tax underwriting gain (loss)
	Third Quarter				First Nine Months				Third Quarter				First Nine Months
	2018		2017		2018		2017		2018		2017		2018		2017
NICO Group	$	1,077	$	1,217	$	3,394	$	3,488	$	(29)	$	(927)	$	272	$	(1,144)
General Re Group		1,080		844		3,085		2,275		96		(559)		263		(712)
	$	2,157	$	2,061	$	6,479	$	5,763	$	67	$	(1,486)	$	535	$	(1,856)

NICO Group’s premiums earned in the third quarter and first nine months of 2018 decreased 11.5% and 2.7%, respectively, compared to 2017. Premiums earned in the third quarter of 2017 included additional amounts related to certain contracts where policy limits were fully exhausted due to catastrophe losses during the quarter. Such amounts would have been earned in future periods. The effect of significant catastrophe losses in 2018 on the timing of premiums earned was relatively insignificant. For the first nine months of 2018, approximately 40% of NICO Group’s premiums earned derived from a 10-year, 20% quota-share contract with Insurance Australia Group Ltd. that expires in 2025. General Re Group’s premiums earned in the third quarter and first nine months of 2018 increased $236 million (28.0%) and $810 million (35.6%), respectively, compared to 2017. The increases reflected higher direct and broker markets business, derived primarily from new business and increased participations for renewal business in both property and casualty lines.

On a combined basis, our property/casualty reinsurance business generated pre-tax underwriting gains of $67 million and $535 million in the third quarter and first nine months of 2018, respectively, and pre-tax losses of approximately $1.5 billion in the third quarter and $1.9 billion in the first nine months of 2017. We incurred estimated losses of approximately $267 million in the third quarter of 2018 related to Hurricane Florence and Typhoon Jebi and approximately $2.29 billion in the third quarter of 2017 related to Hurricanes Harvey, Irma and Maria and an earthquake in Mexico. Our losses from significant catastrophe events were approximately $2.45 billion for the first nine months of 2017.

In addition, we reduced estimated ultimate claims liabilities in the first nine months of 2018 for prior years’ loss events by $581 million. We increased estimated ultimate liabilities for prior years’ loss events by $108 million in the first nine months of 2017, which reflected the U.K. Ministry of Justice’s decision in the first quarter to reduce the fixed discount rate required in lump sum settlement calculations of U.K. personal injury claims and unanticipated property claims from events in 2016.

Retroactive reinsurance

Premiums earned in the first nine months of 2017 included $10.2 billion from an aggregate excess-of-loss retroactive reinsurance agreement with various subsidiaries of American International Group, Inc. (the “AIG Agreement”), which became effective on February 2, 2017. We also recorded losses and loss adjustment expenses incurred of $10.2 billion at the inception of the AIG Agreement, representing our initial estimate of the unpaid losses and loss adjustment expenses assumed of $16.4 billion, partly offset by an initial deferred charge asset of $6.2 billion. Thus, on the effective date, the AIG Agreement had no effect on our pre-tax underwriting results.

Pre-tax underwriting losses from retroactive reinsurance contracts in the third quarter and first nine months of 2018 were $246 million and $704 million, respectively, compared to $287 million and $881 million, respectively, in the same periods in 2017. Certain liabilities relating to retroactive reinsurance contracts written by our U.S. subsidiaries are denominated in foreign currencies. Underwriting results include gains and losses from the re-measurement of such liabilities due to changes in foreign currency exchange rates. Changes in exchange rates generated pre-tax gains of $35 million and $99 million in the third quarter and first nine months of 2018, respectively, compared to pre-tax losses in the third quarter and first nine months of $60 million and $251 million, respectively, in 2017.

Pre-tax underwriting losses before foreign currency gains/losses in the first nine months of 2018 and 2017 were $803 million and $630 million, respectively. The increase in pre-tax losses was primarily due to amortization charges related to the AIG Agreement, which included the effects of increases to our ultimate claim liability estimates (approximately $1.8 billion) and related deferred charge asset (approximately $1.7 billion) in the fourth quarter of 2017.

Gross unpaid losses assumed under retroactive reinsurance contracts were approximately $41.9 billion at September 30, 2018 and $42.9 billion at December 31, 2017. Unamortized deferred charge assets related to such reinsurance contracts were approximately $14.5 billion at September 30, 2018 and $15.3 billion at December 31, 2017. Deferred charge asset balances will be amortized as charges to pre-tax earnings over the expected remaining claims settlement periods.

29

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Insurance—Underwriting (Continued)

Life/health

Premiums earned and pre-tax underwriting results of our life/health reinsurance businesses are further summarized as follows (in millions).

	Premiums earned								Pre-tax underwriting gain (loss)
	Third Quarter				First Nine Months				Third Quarter				First Nine Months
	2018		2017		2018		2017		2018		2017		2018		2017
General Re Group	$	964	$	786	$	2,819	$	2,324	$	38	$	57	$	152	$	96
BHLN Group		343		360		1,036		1,080		70		56		172		206
	$	1,307	$	1,146	$	3,855	$	3,404	$	108	$	113	$	324	$	302

General Re Group’s premiums earned in the third quarter and first nine months of 2018 increased $178 million (22.6%) and $495 million (21.3%), respectively, compared to 2017. The increases were primarily attributable to growth in Asia and Australia markets and foreign currency translation effects of a comparatively weaker U.S. Dollar. The General Re Group produced pre-tax underwriting gains in the first nine months of $152 million in 2018 and $96 million in 2017. The comparative increase in the first nine months reflected increased earnings from international business, primarily due to increased volumes and foreign currency translation, improved earnings from life business in North America and lower losses from the run-off of long-term care and disability business.

BHLN Group’s life reinsurance premiums earned in the third quarter and first nine months of 2018 were $340 million and $1,025 million, respectively, compared to $355 million and $1,067 million, respectively, in the corresponding 2017 periods. BHLN Group’s business during the last two years covered predominantly life risks in North America, with approximately two-thirds of the premiums earned deriving from one reinsurance contract. BHLN Group’s life reinsurance business produced near break-even results in each of the first nine months of 2018 and 2017.

BHLN Group’s pre-tax underwriting results in the first nine months of 2018 and 2017 included pre-tax gains of $166 million and $197 million, respectively, from the run-off of variable annuity reinsurance contracts that provide guarantees on closed blocks of variable annuity business. Periodic underwriting results from this business reflect changes in estimated liabilities for guaranteed benefits, which result from changes in securities markets and interest rates and from the periodic amortization of expected profit margins. Underwriting results from variable annuity contracts can be volatile, reflecting the volatility of securities markets, interest rates and foreign currency exchange rates. Estimated variable annuity guarantee liabilities were approximately $1.6 billion at September 30, 2018 and $1.8 billion at December 31, 2017.

Periodic payment annuity

Periodic payment annuity premiums earned in the third quarter and first nine months of 2018 increased $115 million (58.4%) and $247 million (38.2%), respectively, compared to 2017. Periodic payment annuity contracts produced pre-tax losses of $92 million and $279 million in the third quarter and first nine months of 2018, respectively, compared to pre-tax losses of $185 million and $528 million, respectively, for the same periods in 2017. Certain contracts written by our U.S. subsidiaries are denominated in foreign currencies, primarily the Great Britain Pound Sterling. Pre-tax underwriting results in 2018 included pre-tax gains of $21 million in the third quarter and $57 million in the first nine months from the re-measurement of such liabilities due to changes in exchange rates compared to pre-tax losses of $63 million in the third quarter and $173 million in the first nine months of 2017. Before the effect of foreign currency gains and losses, this business generated pre-tax underwriting losses of $336 million in the first nine months of 2018 and $355 million in the first nine months of 2017. These losses were primarily attributable to the recurring discount accretion of annuity liabilities. Discounted annuity liabilities approximated $12.2 billion at September 30, 2018 and $11.2 billion at December 31, 2017, reflecting a weighted average discount rate of approximately 4.1%.

30

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Insurance—Underwriting (Continued)

Berkshire Hathaway Primary Group

The Berkshire Hathaway Primary Group (“BH Primary”) consists of a wide variety of independently managed insurance underwriting businesses that primarily provide a variety of commercial insurance solutions, including healthcare malpractice, workers’ compensation, automobile, general liability, property and various specialty coverages for small, medium and large clients. The largest of these insurers include Berkshire Hathaway Specialty Insurance (“BH Specialty”), Berkshire Hathaway Homestate Companies (“BHHC”), MedPro Group, Berkshire Hathaway GUARD Insurance Companies (“GUARD”) and National Indemnity Company (“NICO Primary”). Other BH Primary insurers include U.S. Liability Insurance Company, Applied Underwriters and Central States Indemnity Company.

A summary of BH Primary underwriting results follows (dollars in millions).

	Third Quarter								First Nine Months
	2018				2017				2018				2017
	Amount		%		Amount		%		Amount		%		Amount		%
Premiums written	$	2,227			$	1,995			$	6,498			$	5,645
Premiums earned	$	2,050		100.0	$	1,852		100.0	$	5,921		100.0	$	5,287		100.0
Losses and loss adjustment expenses		1,419		69.2		1,342		72.5		3,884		65.6		3,426		64.8
Underwriting expenses		496		24.2		458		24.7		1,569		26.5		1,388		26.3
Total losses and expenses		1,915		93.4		1,800		97.2		5,453		92.1		4,814		91.1
Pre-tax underwriting gain	$	135			$	52			$	468			$	473

Premiums written in the third quarter and first nine months of 2018 increased 11.6% and 15.1%, respectively, compared to the corresponding 2017 periods. These increases were primarily attributable to BH Specialty, MedPro Group, GUARD and BHHC. Premiums earned in the first nine months of 2018 increased $634 million (12.0%) compared to the first nine months of 2017, reflecting the written premium increases of these businesses.

BH Primary produced pre-tax underwriting gains of $135 million and $468 million in the third quarter and first nine months of 2018, respectively, compared to $52 million and $473 million in the third quarter and first nine months of 2017, respectively. Underwriting results in the third quarter included estimated losses of approximately $75 million in 2018 from Hurricane Florence and $225 million in 2017 from Hurricanes Harvey, Irma and Maria.

Losses and loss adjustment expenses in the first nine months also included net reductions of estimated ultimate liabilities for prior years’ loss events of $507 million in 2018 and $606 million in 2017, which produced corresponding increases in pre-tax underwriting gains. The liability reductions in each year primarily related to healthcare malpractice and workers’ compensation business. BH Primary writes significant levels of commercial and professional liability and workers’ compensation insurance and the related claim costs may be subject to higher severity and longer claim-tails, which could give rise to significant increases in claims liabilities in the future attributable to higher than expected claim settlements, adverse litigation outcomes or judicial rulings and other factors not currently anticipated.

Insurance—Investment Income

A summary of net investment income generated from investments held by our insurance operations follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Interest and other investment income	$	495	$	344	$	1,346	$	870
Dividend income		960		902		2,706		2,788
Investment income before income taxes and noncontrolling interests		1,455		1,246		4,052		3,658
Income taxes and noncontrolling interests		216		202		659		741
Net investment income	$	1,239	$	1,044	$	3,393	$	2,917
Effective income tax rate		14.7%		16.2%		16.2%		20.2%

31

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Insurance—Investment Income (Continued)

Pre-tax interest and other investment income in the third quarter and first nine months of 2018 increased $151 million (43.9%) and $476 million (54.7%), respectively, compared to the same periods in 2017. The increases reflected the effect of higher short-term interest rates in 2018 and income from a limited partnership investment in the first quarter, partly offset by lower interest from reduced investments in fixed maturity securities. Our invested assets continue to include significant levels of short-term investments. We believe that maintaining ample liquidity is paramount and we insist on safety over yield with respect to such investments.

Dividend income increased $58 million (6.4%) in the third quarter and decreased $82 million (2.9%) in the first nine months of 2018 as compared to the same periods in 2017. The comparative changes in dividend income reflected the impact of Restaurant Brands International’s redemption of our $3 billion investment in 9% preferred stock in December 2017 and increases in our portfolio of marketable equity securities.

Invested assets of our insurance businesses derive from shareholder capital, including reinvested earnings, and from net liabilities under insurance and reinsurance contracts or “float.” The major components of float are unpaid losses and loss adjustment expenses, including liabilities under retroactive reinsurance contracts, life, annuity and health insurance benefit liabilities, unearned premiums and other liabilities due to policyholders, less premium and reinsurance receivables, deferred charges assumed under retroactive reinsurance contracts and deferred policy acquisition costs. Float approximated $118 billion at September 30, 2018 and $114 billion at December 31, 2017. Our combined insurance operations generated pre-tax underwriting earnings of $2.3 billion in the first nine months of 2018, and consequently, the average cost of float for that period was negative. Our average cost of float for the year ending December 31, 2017 was approximately 3%, reflecting pre-tax underwriting losses of approximately $3.2 billion, most of which was incurred in the second half of the year.

A summary of cash and investments held in our insurance businesses as of September 30, 2018 and December 31, 2017 follows (in millions).

	September 30,  2018		December 31,  2017
Cash, cash equivalents and U.S. Treasury Bills	$	59,292	$	73,285
Equity securities		199,860		163,134
Fixed maturity securities		18,057		21,092
	$	277,209	$	257,511

Fixed maturity investments as of September 30, 2018 were as follows (in millions).

	Amortized  cost		Unrealized   gains/losses		Carrying  value
U.S. Treasury, U.S. government corporations and agencies	$	3,618	$	(26)	$	3,592
States, municipalities and political subdivisions		259		14		273
Foreign governments		7,360		8		7,368
Corporate bonds, investment grade		5,321		388		5,709
Corporate bonds, non-investment grade		563		42		605
Mortgage-backed securities		457		53		510
	$	17,578	$	479	$	18,057

U.S. government obligations are rated AA+ or Aaa by the major rating agencies. Approximately 88% of all state, municipal and political subdivisions, foreign government obligations and mortgage-backed securities were rated AA or higher. Non-investment grade securities represent securities rated below BBB- or Baa3. Foreign government securities include obligations issued or unconditionally guaranteed by national or provincial government entities.

32

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Railroad (“Burlington Northern Santa Fe”)

Burlington Northern Santa Fe, LLC (“BNSF”) operates one of the largest railroad systems in North America. BNSF operates approximately 32,500 route miles of track in 28 states, as well as in three Canadian provinces. BNSF classifies its major business groups by type of product shipped, which include consumer products, coal, industrial products and agricultural products. A summary of BNSF’s earnings follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Revenues	$	6,147	$	5,314	$	17,649	$	15,749
Operating expenses:
Compensation and benefits		1,378		1,173		4,021		3,725
Fuel		859		595		2,456		1,777
Purchased services		718		608		2,124		1,843
Depreciation and amortization		580		591		1,726		1,756
Equipment rents, materials and other		471		384		1,501		1,295
Total operating expenses		4,006		3,351		11,828		10,396
Interest expense		262		253		774		761
		4,268		3,604		12,602		11,157
Pre-tax earnings		1,879		1,710		5,047		4,592
Income taxes		486		668		1,200		1,754
Net earnings	$	1,393	$	1,042	$	3,847	$	2,838
Effective income tax rate		25.9%		39.1%		23.8%		38.2%

BNSF’s revenues in the third quarter and first nine months of 2018 were $6.1 billion and $17.6 billion, respectively, representing increases of $833 million (15.7%) and $1.9 billion (12.1%), respectively, versus the corresponding periods in 2017. During the first nine months of 2018, our overall average revenue per car/unit increased 6.1% and our aggregate volume increased 4.6%. Our year-to-date volume was approximately 8.0 million cars/units compared to 7.6 million in 2017. The increase in average revenue per car/unit was attributable to business mix changes, higher fuel surcharge revenue driven primarily by higher fuel prices, and increased rates per car/unit. Pre-tax earnings were approximately $1.9 billion and $5.0 billion in the third quarter and first nine months of 2018, respectively, increases of 9.9% compared to the corresponding periods in 2017.

Revenues from consumer products were $2.0 billion in the third quarter and $5.8 billion in the first nine months of 2018, representing increases of 11.7% and 12.0%, respectively, from 2017. The increases reflected higher average revenue per unit and volume increases of 0.9% in the third quarter and 3.9% in the first nine months. The volume increases were attributable to the intermodal business, due to general economic growth and tight truck capacity leading to conversion from highway to rail, as well as growth in imports and containerized agricultural product exports, partially offset by a sizable contract loss.

Revenues from industrial products in 2018 were $1.6 billion in the third quarter and $4.4 billion for the first nine months, or increases of 24.3% and 17.3%, respectively, from the comparable 2017 periods. These increases were attributable to volume increases of 13.1% in the third quarter and 10.9% in the first nine months as well as higher average revenue per car. Volumes in 2018 were higher primarily due to strength in the industrial and energy sectors, which drove higher demand for petroleum products, rocks, steel, and plastics. Volumes in the first nine months of 2018 were also higher for sand and taconite.

Revenues from agricultural products in 2018 increased 17.4% in the third quarter to $1.2 billion and increased 10.2% to $3.5 billion for the first nine months when compared to the same periods in 2017. The third quarter revenue increase reflected a 16.3% increase in volumes and higher average revenue per car. In the first nine months, the increase in revenues was attributable to volume increases of 10.5%, partially offset by slightly lower average revenue per car. Volumes in 2018 increased due to strong export and domestic grain shipments, as well as higher fertilizer and other grain products volumes.

Revenues from coal in 2018 increased 5.9% in the third quarter to $1.1 billion and 1.6% in the first nine months to $2.9 billion compared to 2017. These increases reflected higher average revenue per car partially offset by lower volumes of 4.6% in the third quarter and 2.6% year-to-date. The volume decreases in 2018 were due mainly to plant retirements combined with competition from natural gas and renewables, partially offset by market share gains and improved export volumes.

Operating expenses in the third quarter and first nine months of 2018 were $4.0 billion and $11.8 billion, respectively, increases of $655 million (19.5%) and $1.4 billion (13.8%), respectively, compared to the same periods in 2017. Our ratios of operating expenses to revenues were 65.2% in the third quarter and 67.0% for the first nine months of 2018, or increases of 2.1 and 1.0 percentage points, respectively, versus the corresponding prior year periods.

33

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Railroad (“Burlington Northern Santa Fe”) (Continued)

Compensation and benefits expenses increased $205 million (17.5%) for the third quarter of 2018 and $296 million (7.9%) for the first nine months of 2018, primarily due to wage inflation, including a change in estimate of the effect of a pending labor agreement recorded in 2017, increased headcount and higher training costs. Fuel expenses increased $264 million (44.4%) for the third quarter and $679 million (38.2%) for the first nine months of 2018, primarily due to higher average fuel prices and increased volumes.

Purchased services expenses increased $110 million (18.1%) in the third quarter and $281 million (15.2%) in the first nine months of 2018 as compared to 2017. The increases were due to higher purchased transportation costs of our logistics services business, as well as increased intermodal ramping, drayage and other volume-related costs.

In the third quarter and first nine months of 2018, equipment rents, materials and other expense increased $87 million (22.7%) and $206 million (15.9%), respectively, compared to 2017. These increases resulted from higher locomotive materials, personal injury expenses and property taxes. The first nine months also included higher derailment-related costs.

BNSF’s effective income tax rate was 25.9% and 23.8% for the third quarter and first nine months of 2018, respectively, as compared to 39.1% and 38.2%, respectively, in the corresponding periods in 2017. The reduction in the U.S. statutory income tax rate under the TCJA, effective January 1, 2018, drove most of the effective income tax rate reduction. In addition, certain states enacted income tax rate reductions in 2018.

Utilities and Energy (“Berkshire Hathaway Energy Company”)

We currently own 90.4% of the outstanding common stock of Berkshire Hathaway Energy Company (“BHE”), which operates a global energy business. BHE’s domestic regulated utility interests are comprised of PacifiCorp, MidAmerican Energy Company (“MEC”) and NV Energy. In Great Britain, BHE subsidiaries operate two regulated electricity distribution businesses referred to as Northern Powergrid. BHE also owns two domestic regulated interstate natural gas pipeline companies. Other energy businesses include a regulated electricity transmission-only business in Alberta, Canada (“AltaLink, L.P.”) and a diversified portfolio of mostly renewable independent power projects. In addition, BHE also operates the second-largest residential real estate brokerage firm and one of the largest residential real estate brokerage franchise networks in the United States.

The rates our regulated businesses charge customers for energy and services are based, in large part, on the costs of business operations, including income taxes and a return on capital, and are subject to regulatory approval. To the extent these regulated operations are not allowed to include such costs in the approved rates, operating results will be adversely affected. Among its provisions, the TCJA reduced the U.S. federal statutory income tax rate of our domestic regulated utilities from 35% to 21%. BHE’s regulated subsidiaries anticipate passing the benefits of lower income tax expense attributable to the TCJA to customers through regulatory mechanisms, including lower rates and reductions to rate base, which would produce lower revenue and pre-tax earnings in 2018 and future years when compared to 2017. We do not expect the TCJA and related regulatory treatment to have a material adverse impact on BHE’s long-term operating cash flows, subject to actual rulings by regulatory commissions that are expected in 2018 and 2019. Revenues and earnings of BHE are summarized below (in millions).

	Third Quarter								First Nine Months
	Revenues				Earnings				Revenues				Earnings
	2018		2017		2018		2017		2018		2017		2018		2017
PacifiCorp	$	1,386	$	1,443	$	319	$	389	$	3,786	$	3,991	$	704	$	912
MidAmerican Energy Company		857		832		251		250		2,354		2,209		347		402
NV Energy		1,071		1,057		268		347		2,456		2,412		403		539
Northern Powergrid		233		220		58		48		756		685		217		215
Natural gas pipelines		268		198		104		60		889		706		376		303
Other energy businesses		669		636		184		179		1,764		1,670		318		245
Real estate brokerage		1,222		965		83		81		3,263		2,511		180		197
Corporate interest		—		—		(102)		(111)		—		—		(307)		(332)
	$	5,706	$	5,351					$	15,268	$	14,184
Pre-tax earnings						1,165		1,243						2,238		2,481
Income taxes						(49)		177						(279)		296
Net earnings						1,214		1,066						2,517		2,185
Noncontrolling interests						123		114						260		244
Net earnings attributable to Berkshire Hathaway shareholders					$	1,091	$	952					$	2,257	$	1,941
Effective income tax rate						(4.2)%		14.2%						(12.5)%		11.9%

34

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Utilities and Energy (“Berkshire Hathaway Energy Company”) (Continued)

PacifiCorp

PacifiCorp operates a regulated electric utility in portions of several Western states, including Utah, Oregon and Wyoming. Revenues in the third quarter and first nine months of 2018 decreased 4% and 5%, respectively, compared to the same periods in 2017. Retail revenues in the third quarter of 2018 decreased $40 million and $218 million in the first nine months, compared to 2017. The declines reflected the effects of lower average rates ($185 million year-to-date), including the impact of the TCJA ($53 million in the third quarter and $159 million in the first nine months), and a year-to-date reduction in volumes (0.9%), largely attributable to the impacts of weather.

Pre-tax earnings decreased $70 million (18%) in the third quarter and $208 million (23%) in the first nine months of 2018 as compared to the same periods in 2017. Utility margin (operating revenues less fuel and purchased energy costs) in the third quarter and first nine months of 2018 were $904 million and $2,446 million, respectively, representing decreases of $61 million (6%) and $205 million (8%), respectively, versus the comparable periods in 2017. These decreases were primarily due to the declines in revenues, which included the effects of the TCJA. PacifiCorp’s after-tax earnings in the third quarter and first nine months of 2018 were $270 million and $603 million, respectively, representing an increase of $7 million (3%) in the third quarter and a decrease of $15 million (2%) from the first nine months of 2017.

MidAmerican Energy Company

MEC operates a regulated electric and natural gas utility primarily in Iowa and Illinois. Revenues in the third quarter and first nine months of 2018 increased $25 million (3%) and $145 million (7%), respectively, as compared to the same periods in 2017. Electric operating revenues in 2018 increased $20 million in the third quarter and $108 million in the first nine months versus 2017. The third quarter increase was due to higher wholesale and other revenues due to increases in volumes and average prices. The increase in the first nine months was primarily attributable to higher retail revenues of $96 million, reflecting higher recoveries through bill riders (substantially offset in cost of sales, operating expenses and income tax expense) and volumes, partially offset by lower average rates, predominantly from the impact of the TCJA. In the first nine months of 2018, natural gas revenues increased $20 million, primarily due to increased volumes, partially offset by a lower average per-unit price and the effects of the TCJA.

Pre-tax earnings in the third quarter of 2018 were relatively unchanged and in the first nine months decreased $55 million (14%) compared to the same periods in 2017. Electric utility margin in the third quarter and first nine months of 2018 was $587 million and $1,419 million, respectively, increases of $10 million and $84 million, respectively, over the corresponding 2017 periods, which were primarily due to the net increase in retail revenues in the first nine months. However, the year-to-date increase in electric utility margin was more than offset by increased depreciation, maintenance and other operating expenses. The year-to-date increase in depreciation expense included $83 million from Iowa revenue sharing and $47 million from additional wind generation and other plant placed in-service.

MEC’s after-tax earnings in the third quarter and first nine months of 2018 were $479 million and $685 million, respectively, increases of $96 million (25%) and $69 million (11%), respectively, as compared to the same periods in 2017. MEC’s after-tax earnings in 2018 and 2017 were significantly greater than pre-tax earnings due to the significant production income tax credits received relating to wind-powered generating facilities.

NV Energy

NV Energy operates regulated electric and natural gas utilities in Nevada. Revenues in the third quarter and first nine months of 2018 increased 1% and 2%, respectively, compared to the same periods in 2017. Electric operating revenues increased $12 million in the third quarter and $34 million in the first nine months of 2018, reflecting increased pass-through cost adjustments and higher volumes largely attributable to the impacts of weather and retail customer growth, partly offset by reductions from the impact of the TCJA and lower retail rates resulting from a 2017 regulatory rate review. Natural gas operating revenue increased $8 million in the first nine months of 2018, primarily due to a higher average per-unit price, partially offset by lower customer usage.

35

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Utilities and Energy (“Berkshire Hathaway Energy Company”) (Continued)

NV Energy (Continued)

Pre-tax earnings in the third quarter and first nine months of 2018 decreased $79 million (23%) and $136 million (25%), respectively, compared to the same periods in 2017. The decreases were primarily due to lower electric utility margin and increased depreciation, maintenance and other operating costs. Electric utility margin in the third quarter and first nine months of 2018 was $623 million and $1,366 million, respectively, representing decreases of $17 million (3%) and $38 million (3%) versus the comparable periods in 2017. The decreases were primarily due to the effects of the TCJA offset by the higher sales volumes. NV Energy’s after-tax earnings in the third quarter and first nine months of 2018 were $201 million and $311 million, respectively, declines of 10% from each of the corresponding 2017 periods.

Northern Powergrid

Revenues increased $13 million and $71 million in the third quarter and first nine months of 2018 compared to same periods in 2017, primarily due to the favorable foreign currency translation effects of a weaker U.S. Dollar in the first nine months of 2018 and increased smart meter and distribution revenues. Pre-tax earnings in the third quarter of 2018 increased $10 million (21%) and $2 million (1%) in the first nine months of 2018 compared to 2017, primarily due to favorable foreign currency translation effects and the increases in revenues, partly offset by higher depreciation and other operating expenses, including higher pension settlement losses in 2018.

Natural gas pipelines

Revenues increased $70 million (35%) in the third quarter and $183 million (26%) in the first nine months of 2018 compared to 2017, primarily due to higher transportation revenues of $58 million and $102 million, respectively, from higher volumes and rates due to unique market opportunities and increased gas sales volumes related to system balancing activities, which were largely offset in cost of sales. Pre-tax earnings increased $44 million (73%) and $73 million (24%) in the third quarter and first nine months of 2018, respectively, compared to 2017. The increases were primarily due to the increases in transportation revenues and lower depreciation expense, partly offset by comparative increases in operations and maintenance expenses.

Other energy businesses

Revenues increased $33 million (5%) in the third quarter and $94 million (6%) in the first nine months of 2018 compared to the same periods in 2017, reflecting comparative year-to-date increases from renewable energy of 10% and from AltaLink, L.P. of 4%. Pre-tax earnings in the third quarter and first nine months of 2018 increased $5 million and $73 million, respectively, compared to the same periods in 2017. The increases were primarily attributable to the increased revenues from renewable energy and AltaLink, L.P., partly offset by increased depreciation expense and higher other operating expenses.

Real estate brokerage

Revenues in the third quarter and first nine months of 2018 increased 27% and 30%, respectively, as compared to the same periods in 2017, primarily due to recent business acquisitions. Pre-tax earnings decreased $17 million in the first nine months of 2018 compared to 2017, primarily due to higher operating costs and interest expense, partially offset by higher margin.

Corporate interest

Corporate interest includes interest on unsecured debt issued by the BHE holding company and borrowings from Berkshire insurance subsidiaries in connection with certain of BHE’s business acquisitions. The borrowings from Berkshire insurance subsidiaries were repaid in the third quarter of 2017. Corporate interest declined 7.5% in the first nine months of 2018 as compared to 2017, primarily due to lower average borrowings.

Income taxes

BHE’s consolidated effective income tax rate for the first nine months of 2018 and 2017 was (12.5)% and 11.9%, respectively. BHE’s effective income tax rates regularly reflect significant production tax credits from wind-powered electricity generation placed in service by our domestic regulated utilities and other energy businesses. The effective tax rate in the first nine months of 2018 decreased primarily due to the reduction in the U.S. federal corporate income tax rate, as well as from lower state income tax expense, an increase in recognized production tax credits, lower U.S. income taxes on foreign earnings and impacts of rate making.

36

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Manufacturing, Service and Retailing

A summary of revenues and earnings of our manufacturing, service and retailing businesses follows (in millions).

	Third Quarter								First Nine Months
	Revenues				Earnings *				Revenues				Earnings *
	2018		2017		2018		2017		2018		2017		2018		2017
Manufacturing	$	13,552	$	12,819	$	2,012	$	2,002	$	40,339	$	37,654	$	6,002	$	5,428
Service and retailing		19,796		19,325		672		536		58,061		56,650		2,011		1,641
	$	33,348	$	32,144					$	98,400	$	94,304
Pre-tax earnings						2,684		2,538						8,013		7,069
Income taxes and noncontrolling interests						587		844						1,953		2,396
					$	2,097	$	1,694					$	6,060	$	4,673
Effective income tax rate						21.3%		32.7%						23.8%		33.3%

* Excludes certain acquisition accounting expenses, which were primarily from the amortization of identified intangible assets recorded in connection with our business acquisitions. The after-tax acquisition accounting expenses excluded from earnings in the preceding table were $192 million and $614 million in the third quarter and first nine months of 2018, respectively, compared to $184 million and $485 million in the third quarter and first nine months of 2017, respectively. These expenses are included in “Other” in the summary of earnings on page 26 and in the “Other” earnings section on page 42.

Manufacturing

Our manufacturing group includes a variety of businesses that produce and distribute industrial, building and consumer products. Industrial products businesses include specialty chemicals (The Lubrizol Corporation (“Lubrizol”)), complex metal products for aerospace, power and general industrial markets (Precision Castparts Corp. (“PCC”)), metal cutting tools/systems (IMC International Metalworking Companies (“IMC”)), equipment and systems for the livestock and agricultural industries (CTB International (“CTB”)), and a variety of products for diverse markets (Marmon, Scott Fetzer and LiquidPower Specialty Products (“LSPI”)).

Our building products businesses include flooring (Shaw), insulation, roofing and engineered products (Johns Manville), bricks and masonry products (Acme Building Brands), paint and coatings (Benjamin Moore), and residential and commercial construction and engineering products and systems (MiTek). Our consumer products businesses include leisure vehicles (Forest River), several apparel and footwear operations (including Fruit of the Loom, Garan, H.H. Brown Shoe Group and Brooks Sports) and the Duracell Company (“Duracell”), a manufacturer of high performance alkaline batteries. This group also includes custom picture framing products (Larson Juhl) and jewelry products (Richline). A summary of revenues and pre-tax earnings of our manufacturing operations follows (in millions).

	Third Quarter								First Nine Months
	Revenues				Pre-tax earnings				Revenues				Pre-tax earnings
	2018		2017		2018		2017		2018		2017		2018		2017
Industrial products	$	7,119	$	6,657	$	1,297	$	1,247	$	21,483	$	19,802	$	4,012	$	3,508
Building products		3,389		3,124		375		407		9,563		8,983		1,042		1,057
Consumer products		3,044		3,038		340		348		9,293		8,869		948		863
	$	13,552	$	12,819	$	2,012	$	2,002	$	40,339	$	37,654	$	6,002	$	5,428

Aggregate revenues of our manufacturing businesses in the third quarter and first nine months of 2018 were approximately $13.6 billion and $40.3 billion, increases of $733 million (5.7%) and approximately $2.7 billion (7.1%), respectively, compared to the same periods in 2017. Pre-tax earnings in the third quarter of 2018 were approximately $2.0 billion, relatively unchanged from 2017, and $6.0 billion in the first nine months of 2018, an increase of $574 million (10.6%) compared to 2017. Pre-tax earnings in the first nine months of 2017 included pre-tax losses of approximately $190 million (predominantly in the first quarter) in connection with the disposition of an underperforming bolt-on business acquired by Lubrizol in 2014. Excluding these losses, pre-tax earnings in the first nine months of 2018 increased 6.8% compared to 2017. Results of our manufacturing businesses in 2018 generally reflected higher revenues compared to 2017. However, manufacturing costs and operating expenses were also higher, partly offsetting the revenue increases, particularly in the third quarter.

Industrial products

Revenues from industrial products businesses were approximately $7.1 billion in the third quarter and $21.5 billion in the first nine months of 2018, or increases of $462 million (6.9%) and $1.7 billion (8.5%), respectively, compared to 2017. PCC’s revenues in the third quarter and first nine months of 2018 increased approximately 5.9% and 6.3%, respectively, over the same periods in 2017. The increases reflected increased demand in aerospace markets in connection with new aircraft programs, partly offset by lower demand for industrial gas turbine products.

37

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Manufacturing, Service and Retailing (Continued)

Industrial products (Continued)

Lubrizol’s revenues in the third quarter and first nine months of 2018 increased 7.3% and 7.6%, respectively, compared to 2017, primarily due to higher prices, changes in product mix and favorable foreign currency translation. Lubrizol experienced a significant increase in average material unit costs during 2018 and 2017, necessitating increases in sales prices. Lubrizol’s consolidated sales volumes increased 6% and 3%, respectively, in the third quarter and first nine months of 2018, as compared to 2017. IMC’s revenues increased 11.7% in the third quarter and 20.0% in the first nine months of 2018 compared to 2017, due to a combination of factors, including increased unit sales (particularly over the first half of the year), business acquisitions and foreign currency translation effects from a weaker U.S. Dollar in the first half of 2018.

Marmon’s revenues in the third quarter and first nine months of 2018 increased 4.0% and 7.6%, respectively, as compared to 2017. Revenue increases were primarily attributable to higher average metals prices, business acquisitions and growth in heavy-duty transportation product lines, partially offset by lower sales from the beverage and retail products businesses and lower steel distribution volume. CTB’s revenues increased 6.0% in the first nine months of 2018 versus 2017, due to favorable foreign currency effects and modest sales growth in protein production and grain systems during the third quarter.

Pre-tax earnings of the industrial products group were $1.3 billion in the third quarter and $4.0 billion in the first nine months of 2018, representing increases of $50 million (4.0%) and $504 million (14.4%), respectively, compared to 2017. Our results in the first nine months of 2017 included pre-tax losses of approximately $190 million, substantially all of which were in the first quarter, related to Lubrizol’s disposition of an underperforming bolt-on business and related intangible asset impairments and restructuring charges. Excluding the effects of these losses, pre-tax earnings of the industrial products group increased 8.5% in the first nine months of 2018 as compared to 2017.

PCC’s pre-tax earnings decreased 2.0% in the third quarter and 6.2% in the first nine months of 2018 compared to 2017. Results in 2018 were negatively affected by costs associated with the temporary unplanned shut-downs of certain metals facilities, metal press outages and lower earnings from the industrial gas turbine business. The closed facilities are gradually resuming production, with most expected to becoming fully operational by the end of 2018. In addition, the aforementioned new aircraft programs involve relatively complex manufacturing processes and manufacturing costs (including personnel training costs) have been relatively high to-date, but we expect costs will decline as processes and efficiencies develop.

Lubrizol’s pre-tax earnings, excluding the effects of the losses on the disposition of a bolt-on business in 2017, increased approximately 16% in the first nine months of 2018 compared to 2017. The increase was primarily due to increases in sales volumes and selling prices, as well as by lower interest expense and the favorable effects of foreign currency translation, somewhat offset by higher raw material costs and operating expenses. IMC’s pre-tax earnings increased significantly in the first nine months of 2018 compared to the same periods in 2017, reflecting a combination of increased sales, increased manufacturing efficiencies, the effects of business acquisitions and ongoing expense control efforts, partly offset by the effects of rising raw material costs.

Marmon’s pre-tax earnings in 2018 increased 3.2% in the third quarter and 12.3% in the first nine months compared to the same periods in 2017. The increase in the first nine months was primarily due to a non-recurring gain of $43 million from the sale of certain assets of its beverage products business in the second quarter.

Building products

Revenues of the building products group in the third quarter and first nine months of 2018 were approximately $3.4 billion and $9.6 billion, respectively, increases of $265 million (8.5%) and $580 million (6.5%), respectively, compared to the corresponding 2017 periods. For the third quarter and first nine months of 2018, the increases reflected higher average selling prices, product mix changes and unit increases with respect to certain flooring and insulation products. The selling price increases in 2018 were in response to significant material cost increases over the past two years.

Pre-tax earnings of the building products group in the third quarter and first nine months of 2018 were $375 million and $1,042 million, respectively, decreases of 7.9% and 1.4%, respectively, versus the corresponding 2017 periods. Raw material and production costs rose over the first nine months of 2018, which together with increased facilities closure costs, more than offset most of the increases in revenues. In particular, costs for steel, titanium dioxide and petrochemicals were substantially higher in 2018 than in 2017. The increases in selling prices have lagged the increases in raw materials costs and, consequently, gross margin rates have deteriorated.

38

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Manufacturing, Service and Retailing (Continued)

Consumer products

Revenues of the consumer products group in the third quarter of 2018 were approximately $3.0 billion, essentially unchanged from 2017. Our apparel and footwear businesses generated a comparative third quarter revenue increase of 6%, offset by lower revenues from Forest River and Duracell. These increases and decreases were primarily attributable to changes in unit sales, and to a lesser extent, selling prices and sales mix changes. Most significantly, Forest River experienced a comparative 7% decline in third quarter unit sales. Revenues in the first nine months of 2018 were approximately $9.3 billion, an increase of $424 million (4.8%) compared to the first nine months of 2017. The year-to-date increase included increases from Forest River (5%) and our apparel and footwear businesses (6%), which were primarily due to increased volume from Brooks Sports and Garan.

Pre-tax earnings of the consumer products group were $340 million in the third quarter of 2018, a decrease of 2.3% from 2017. The decline reflected lower earnings from Forest River (24%), partially offset by increased earnings from the apparel and footwear businesses (5%) and Duracell (8%). Pre-tax earnings for the first nine months of 2018 were $948 million, an increase of $85 million (9.8%) compared to 2017. The comparative increase in year-to-date earnings reflected increases from Duracell (47%) and the apparel and footwear businesses (9%), partly offset by lower earnings from Forest River and Larson Juhl.

During 2018, and in the third quarter in particular, Forest River’s results were affected by higher material costs, which together with the effects of lower sales volume in the third quarter, contributed to reductions in its gross sales margin rates and pre-tax earnings. The comparative earnings increases of the apparel and footwear businesses in 2018 were primarily attributable to revenue increases. Duracell’s earnings increases in 2018 reflected the favorable effects of ongoing operational restructuring efforts and comparatively lower restructuring charges.

Service and retailing

A summary of revenues and pre-tax earnings of our service and retailing businesses follows (in millions).

	Third Quarter								First Nine Months
	Revenues				Pre-tax earnings				Revenues				Pre-tax earnings
	2018		2017		2018		2017		2018		2017		2018		2017
Service	$	3,141	$	2,775	$	444	$	315	$	9,219	$	8,184	$	1,268	$	926
Retailing		3,833		3,752		184		176		11,404		10,986		572		513
McLane Company		12,822		12,798		44		45		37,438		37,480		171		202
	$	19,796	$	19,325	$	672	$	536	$	58,061	$	56,650	$	2,011	$	1,641

Service

Our service businesses offer fractional ownership programs for general aviation aircraft (NetJets) and high technology training to operators of aircraft (FlightSafety). We also distribute electronic components (TTI) and franchise and service a network of quick service restaurants (Dairy Queen). Service businesses also include the electronic distribution of corporate news, multimedia and regulatory filings (Business Wire), publication of newspapers and other publications (Buffalo News and the BH Media Group) and operation of a television station in Miami, Florida (WPLG). We also offer third party logistics services that primarily serve the petroleum and chemical industries (Charter Brokerage).

Revenues of the service group were approximately $3.1 billion in the third quarter and $9.2 billion in the first nine months of 2018, representing increases of $366 million (13.2%) and $1.0 billion (12.6%), respectively, as compared to the same periods in 2017. TTI’s revenues in the third quarter and first nine months of 2018 increased approximately 35% compared to the same periods in 2017. The increases reflected an industry-wide increase in demand throughout 2018 for electronic components in many geographic markets around the world, and from the effects of business acquisitions and foreign currency translation due to a weaker U.S. Dollar. While TTI’s revenue increases were significant, we believe that demand is beginning to moderate. Otherwise, Charter Brokerage, FlightSafety and WPLG generated comparative revenue increases in the first nine months of 2018, while the revenues from most of our other service businesses declined from 2017.

Pre-tax earnings of the service group in the third quarter and first nine months of 2018 were $444 million and $1.3 billion, respectively, increases of $129 million (41.0%) and $342 million (36.9%), respectively, compared to the same periods in 2017. The comparative increases in earnings in 2018 were driven by the aforementioned revenue increases at TTI, which accounted for almost 70% of these increases, as well as from earnings increases at Charter Brokerage and NetJets.

Retailing

Our retailers include Berkshire Hathaway Automotive (“BHA”). BHA includes over 80 auto dealerships that sell new and pre-owned automobiles, and offer repair services and related products. BHA also operates two insurance businesses, two auto auctions and an automotive fluid maintenance products distributor. Our retailing businesses also include four home furnishings retailing businesses (Nebraska Furniture Mart, R.C. Willey, Star Furniture and Jordan’s), which sell furniture, appliances, flooring and electronics.

39

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Manufacturing, Service and Retailing (Continued)

Retailing (Continued)

Our other retailing businesses include three jewelry retailing businesses (Borsheims, Helzberg and Ben Bridge), See’s Candies (confectionary products), Pampered Chef (high quality kitchen tools), Oriental Trading Company (party supplies, school supplies and toys and novelties) and Detlev Louis Motorrad (“Louis”), a Germany-based retailer of motorcycle accessories.

Revenues of the retailing business in the third quarter and first nine months of 2018 were $3.8 billion and $11.4 billion, respectively, increases of $81 million (2.2%) and $418 million (3.8%), respectively, compared to the same periods in 2017. BHA’s revenues, which represented approximately 64% of the year-to-date retailing revenues in 2018, increased 2.1% in the third quarter and 4.0% in the first nine months of 2018 as compared to 2017. The increases derived primarily from increased pre-owned vehicle sales. Revenues from new vehicle sales were down 2.3% in the third quarter and relatively unchanged for the first nine months. In addition, Louis revenues increased 9.1% in the first nine months of 2018, due primarily to foreign currency translation effects and comparatively higher sales. Revenues of our home furnishings businesses increased 5.4% in the first nine months of 2018 compared to 2017, due to higher volumes in certain geographic markets and the effect of a new store, which opened in 2018.

Pre-tax earnings in the third quarter and first nine months of 2018 from retailing were $184 million and $572 million, respectively, increases of $8 million (4.5%) and $59 million (11.5%), respectively, over 2017. The increases were primarily attributable to BHA and Louis. The earnings increases of BHA were primarily from finance and insurance activities, while the increases at Louis were primarily attributable to the revenue increases.

McLane Company

McLane operates a wholesale distribution business that provides grocery and non-food consumer products to retailers and convenience stores (“grocery”) and to restaurants (“foodservice”). McLane also operates businesses that are wholesale distributors of distilled spirits, wine and beer (“beverage”). The grocery and foodservice units generate high sales volumes and very low operating margins and have several significant customers, including Wal-Mart, 7-Eleven and Yum! Brands. A curtailment of purchasing by any of its significant customers could have an adverse impact on McLane’s periodic revenues and earnings.

Revenues for the third quarter and first nine months of 2018 were $12.8 billion and $37.4 billion, respectively, relatively unchanged compared to the same periods in 2017. On a year-to-date basis, grocery sales increased 0.8% and foodservice sales declined 2.4%, compared to 2017. The decline in foodservice revenues was primarily due to a net loss of customers.

Pre-tax earnings in the third quarter of 2018 were $44 million, essentially unchanged from 2017, while pre-tax earnings in the first nine months of 2018 of $171 million declined $31 million (15.3%), compared to 2017. McLane’s grocery and foodservice businesses continue to operate in a highly competitive business environment, which is negatively affecting its operating results. Gross margin rates increased slightly over the first nine months of 2018, but were more than offset by increases in fuel, depreciation and certain other operating expenses, producing a decline in its operating margin rate compared to 2017. We expect the current unfavorable operating conditions will continue into 2019.

Finance and Financial Products

Our finance and financial products businesses include manufactured and site built housing and finance (Clayton Homes), transportation equipment manufacturing and leasing businesses (UTLX and XTRA, and together, “transportation equipment leasing”), as well as other leasing and financing activities. A summary of earnings from our finance and financial products businesses follows (in millions).

	Third Quarter								First Nine Months
	Revenues				Earnings				Revenues				Earnings
	2018		2017		2018		2017		2018		2017		2018		2017
Manufactured housing and finance	$	1,580	$	1,318	$	205	$	173	$	4,336	$	3,591	$	634	$	546
Transportation equipment leasing		674		652		209		219		2,000		1,928		624		649
Other		178		183		116		104		525		500		331		243
	$	2,432	$	2,153					$	6,861	$	6,019
Pre-tax earnings						530		496						1,589		1,438
Income taxes and noncontrolling interests						140		177						396		505
					$	390	$	319					$	1,193	$	933
Effective income tax rate						26.6%		35.6%						25.0%		35.1%

40

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Finance and Financial Products (Continued)

Manufactured housing and finance

Clayton Homes’ revenues in the third quarter and first nine months of 2018 were approximately $1.6 billion and $4.3 billion, respectively, increases of $262 million (19.9%) and $745 million (20.7%), respectively, over the corresponding 2017 periods. The increases reflected year-to-date increases in home sales of 29% and in financial services revenue of approximately 4%. The increase in home sales was primarily due to a 104% year-to-date increase in unit sales of site built homes attributable to business acquisitions during the last two years, and to increased unit sales of manufactured homes. Average unit prices of site built homes are considerably higher than our traditional manufactured homes. The increase in financial services revenue was primarily attributable to increased interest income from a comparative increase in average loan balances of approximately 5% over the first nine months of 2018 as compared to 2017. As of September 30, 2018, Clayton Homes’ loan balances were approximately $14.4 billion.

Pre-tax earnings in the third quarter and first nine months of 2018 were $205 million and $634 million, respectively, increases of $32 million (18.5%) and $88 million (16.1%), respectively, compared to the same periods in 2017. The increases in earnings reflected increased manufactured and site built home sales and financial services interest income, lower corporate overhead costs and credit losses, partly offset by increased interest expense and the effects of an $11 million gain from a legal settlement in 2017.

Transportation equipment leasing

Transportation equipment leasing revenues in 2018 were $674 million in the third quarter and $2.0 billion in the first nine months, increases of 3.4% and 3.7%, respectively, over the comparable 2017 periods. Revenues in 2018 of our over-the-road trailer leasing business increased 14% in the third quarter and 13% in the first nine months over the same periods in 2017, primarily due to increased units on lease. Revenues in the third quarter of 2018 of our railcar and crane services businesses were relatively unchanged compared to 2017, while revenues in the first nine months increased $32 million (2%) compared to 2017. The increase in year-to-date revenues was attributable to increased railcar equipment sales, railcar repair services and crane services, partly offset by lower railcar lease revenues. Throughout 2018, we have experienced negative impacts from lower railcar lease renewal rates versus the higher rates on expiring leases.

Pre-tax earnings in 2018 were $209 million in the third quarter and $624 million in the first nine months, decreases of $10 million (4.6%) and $25 million (3.9%), respectively, compared to the same periods in 2017. The decreases were due to lower earnings from the railcar leasing business, attributable to the decline in lease revenues and higher repair costs, partly offset by increased earnings of our over-the-road trailer and crane services businesses. Significant components of the operating costs of these businesses, such as depreciation, interest and certain other operating costs, do not vary proportionately to revenue changes. Thus, changes in revenues can disproportionately affect earnings.

Other

Other earnings from our finance activities include CORT furniture leasing and other investment income. Other earnings also include interest income on loans to finance Clayton Homes’ loan portfolio and transportation equipment held for lease (charged as interest expense in the results of those businesses) and interest expense on related borrowings of Berkshire Hathaway Finance Corporation (“BHFC”). The net interest (income, net of expense) related to such loans increased $81 million in the first nine months of 2018 compared to 2017, which reflected increased interest income and lower interest expense of BHFC.

Investment and Derivative Gains/Losses

A summary of investment and derivative gains and losses follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Investment gains/losses	$	14,569	$	657	$	12,750	$	1,262
Derivative gains/losses		137		308		303		703
Gains/losses before income taxes and noncontrolling interests		14,706		965		13,053		1,965
Income taxes and noncontrolling interests		3,046		342		2,701		695
Net gains/losses	$	11,660	$	623	$	10,352	$	1,270
Effective income tax rate		20.5%		35.3%		20.8%		35.3%

41

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Investment and Derivative Gains/Losses (Continued)

Investment gains/losses

As discussed in Note 2 to the accompanying Consolidated Financial Statements, on January 1, 2018, we adopted a new accounting pronouncement (“ASU 2016-01”), which requires the recognition of unrealized gains and losses arising from changes in market values of investments in equity securities in the Consolidated Statements of Earnings. Prior to 2018, investment gains/losses related to equity securities were generally recorded as the securities were sold, redeemed or exchanged and were based on the cost of the disposed securities. While ASU 2016-01 does not affect our consolidated shareholders’ equity or total comprehensive income, it is expected to significantly increase the volatility of our periodic net earnings given the magnitude of our existing equity securities portfolio and the inherent volatility of equity securities prices. Investment gains and losses have caused and will continue to cause significant volatility in earnings reported in our Consolidated Statements of Earnings.

Pre-tax investment gains/losses reflected in earnings in 2018 included net unrealized gains of approximately $14.3 billion in the third quarter and $12.1 billion for the first nine months from investments in equity securities still held at September 30, 2018. Prior to the adoption of ASU 2016-01, such unrealized gains and losses were included in other comprehensive income. ASU 2016-01 did not permit the restatement of prior years’ statements of earnings.

We believe that investment gains/losses, whether realized from sales or unrealized from changes in market prices, are often meaningless in terms of understanding our reported results or evaluating our periodic economic performance. We continue to believe the amount of investment gains/losses included in earnings in any given period typically has little analytical or predictive value. The effects of changes in market prices for equity securities now reported in earnings are unpredictable over any quarterly or annual period.

Derivative gains/losses

Derivative contract gains/losses represent the changes in fair value of our equity index put option contract liabilities. These liabilities relate to contracts entered into before March 2008 and that will expire between April 2019 and January 2026. The periodic changes in the fair values of these liabilities are recorded in earnings and can be significant, reflecting the volatility of underlying equity markets and the changes in the inputs used to measure such liabilities.

As of September 30, 2018, the intrinsic value of our equity index put option contracts was approximately $919 million and our recorded liabilities at fair value were approximately $1.9 billion. Our ultimate payment obligations, if any, under our contracts will be determined as of the contract expiration dates and will be based on the intrinsic value as defined under the contracts. Derivative contracts produced pre-tax gains in the first nine months of 2018 of $303 million, which were primarily due to foreign currency exchange rate changes and the effects of shorter average contract durations, partially offset by lower values on certain indexes. Derivative contracts produced pre-tax gains of $703 million in the first nine months of 2017, which were primarily attributable to higher equity index values and shorter contract durations, partly offset by unfavorable foreign currency exchange rate changes.

Other

A summary of after-tax other earnings (losses) follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Equity method earnings	$	269	$	248	$	894	$	807
Acquisition accounting expenses		(199)		(196)		(637)		(518)
Corporate interest expense, before foreign currency exchange rate effects		(77)		(66)		(236)		(198)
Corporate interest expense, Euro note foreign currency exchange rate effects		56		(172)		216		(571)
Other		180		18		283		25
Net earnings (losses) attributable to Berkshire Hathaway shareholders	$	229	$	(168)	$	520	$	(455)

After-tax equity method earnings includes Berkshire’s share of earnings attributable to Kraft Heinz, Pilot Flying J, Berkadia and Electric Transmission of Texas. After-tax other earnings (losses) also include charges arising from the application of the acquisition method in connection with Berkshire’s past business acquisitions. Such charges were primarily from the amortization of intangible assets recorded in connection with those business acquisitions. Berkshire issued Euro denominated debt in 2015, 2016 and 2017 and at September 30, 2018, the aggregate par amount outstanding was €6.85 billion. Changes in foreign currency exchange rates in 2018 and 2017 produced sizable non-cash gains and losses from the periodic revaluation of these liabilities into U.S. Dollars.

42

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Financial Condition

Our consolidated balance sheet continues to reflect significant liquidity and a strong capital base. Our consolidated shareholders’ equity at September 30, 2018 was $375.6 billion, increases of $17.5 billion since June 30, 2018 and $27.3 billion since December 31, 2017. Net earnings attributable to Berkshire shareholders in the first nine months of 2018 were $29.4 billion, which included after-tax gains on our investments of approximately $10.1 billion. Most of these gains derived from changes in market prices for securities we owned at September 30, 2018.

At September 30, 2018, our insurance and other businesses held cash, cash equivalents and U.S. Treasury Bills of approximately $96.5 billion, which included $74.5 billion in U.S. Treasury Bills. Investments in securities (excluding our investment in Kraft Heinz) were $219.5 billion. Berkshire parent company debt outstanding at September 30, 2018 was approximately $17.0 billion, a decrease of $1.8 billion from December 31, 2017, reflecting maturities of $1.55 billion in term debt and a $273 million year-to-date decrease attributable to foreign currency exchange rate changes applicable to the €6.85 billion par amount of Euro denominated senior notes. The next maturity of Berkshire parent company debt is August 2019.

Our railroad, utilities and energy businesses (conducted by BNSF and BHE) maintain very large investments in capital assets (property, plant and equipment) and will regularly make significant capital expenditures in the normal course of business. We forecast capital expenditures of these two operations will approximate $9.8 billion for the year ending December 31, 2018, of which approximately $6.4 billion was expended during the first nine months.

BNSF’s outstanding debt approximated $23.3 billion as of September 30, 2018, an increase of $758 million since December 31, 2017. In August 2018, BNSF issued $750 million of 4.15% senior unsecured debentures due in 2048. Outstanding borrowings of BHE and its subsidiaries were approximately $39.3 billion at September 30, 2018, a decrease of $337 million since December 31, 2017. In July 2018, BHE issued $1.0 billion of 4.45% senior unsecured debt that matures in 2049. BHE subsidiaries also issued debt in July 2018, aggregating $1.05 billion and due in 2049. The proceeds from these financings were used to repay borrowings and for other general corporate purposes. Approximately $500 million of BHE subsidiary term debt will mature in the fourth quarter of 2018, and another $1.4 billion will mature in the first quarter of 2019. Berkshire does not guarantee the repayment of debt issued by BNSF, BHE or any of their subsidiaries and is not committed to provide capital to support BNSF, BHE or any of their subsidiaries.

Finance and financial products assets were approximately $38.3 billion as of September 30, 2018, a decrease of $3.6 billion since December 31, 2017. Finance assets consist primarily of loans and finance receivables, various types of property held for lease, cash, cash equivalents and U.S. Treasury Bills. Finance and financial products liabilities declined $2.3 billion in the first nine months of 2018 to approximately $14.4 billion at September 30, 2018, primarily attributable to a net decrease in borrowings of a wholly-owned financing subsidiary, Berkshire Hathaway Finance Corporation (“BHFC”). During the first nine months of 2018, BHFC repaid $4.6 billion of maturing senior notes and in August 2018 issued $2.35 billion of 4.2% senior notes due in 2048. In the first quarter of 2019, an additional $2.7 billion of BHFC senior notes will mature. BHFC’s senior note borrowings are used to fund loans originated and acquired by Clayton Homes and a portion of assets held for lease by our UTLX railcar leasing business. Berkshire guarantees the full and timely payment of principal and interest with respect to BHFC’s senior notes.

Berkshire has a common stock repurchase program which, as amended on July 17, 2018, permits Berkshire to repurchase its Class A and Class B shares at prices below Berkshire’s intrinsic value, as conservatively determined by Warren Buffett, Berkshire’s Chairman of the Board and Chief Executive Officer, and Charlie Munger, a Vice-Chairman of the Board. The program allows share repurchases in the open market or through privately negotiated transactions and does not specify a maximum number of shares to be repurchased. The program is expected to continue indefinitely. We will not repurchase our stock if it reduces the total amount of Berkshire’s consolidated cash, cash equivalents and U.S. Treasury Bills holdings below $20 billion. Financial strength and redundant liquidity will always be of paramount importance at Berkshire. In the third quarter of 2018, Berkshire paid $928 million to repurchase shares of Class A and B common stock under the program.

Contractual Obligations

We are party to contracts associated with ongoing business and financing activities, which will result in cash payments to counterparties in future periods. Certain obligations are included in our Consolidated Balance Sheets, such as notes payable, which require future payments on contractually specified dates and in fixed and determinable amounts. Other obligations pertaining to the acquisition of goods or services in the future, such as minimum rentals under operating leases and certain purchase obligations not currently reflected in the financial statements, will be recognized in future periods as the goods are delivered or services are provided. The timing and amount of the payments under certain contracts, such as insurance and reinsurance contracts, are contingent upon the outcome of future events and claim settlements. Actual payments will likely vary, perhaps materially, from the estimated liabilities currently recorded in our Consolidated Balance Sheet.

43

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (Continued)

Contractual Obligations (Continued)

Our contractual obligations as of December 31, 2017 were disclosed in the “Contractual Obligations” section of “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in Berkshire’s Annual Report on Form 10-K for the year ended December 31, 2017. During the first nine months of 2018, our subsidiaries issued term debt of approximately $9.4 billion, which included approximately $5.2 billion in the third quarter. The borrowings in 2018 were used to repay existing debt, as well as for other corporate purposes. Interest and principal payments in connection with these new borrowings in the aggregate are due as follows: 2019 and 2020 — $1.3 billion; 2021 and 2022 — $1.1 billion; and thereafter $16.4 billion.

Critical Accounting Policies

Certain accounting policies require us to make estimates and judgments that affect the amounts reflected in the Consolidated Financial Statements. Such estimates and judgments necessarily involve varying, and possibly significant, degrees of uncertainty. Accordingly, certain amounts currently recorded in the financial statements will likely be adjusted in the future based on new available information and changes in other facts and circumstances. Reference is made to “Critical Accounting Policies” discussed in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in Berkshire’s Annual Report on Form 10-K for the year ended December 31, 2017.

Our Consolidated Balance Sheet as of September 30, 2018 includes estimated liabilities for unpaid losses and loss adjustment expenses from property and casualty insurance and reinsurance contracts of approximately $106 billion. Due to the inherent uncertainties in the process of establishing loss reserve amounts, the actual ultimate claim amounts will likely differ from the currently recorded amounts. A very small percentage change in estimates of this magnitude will result in a material effect on periodic earnings. The effects from changes in these estimates are recorded as a component of insurance losses and loss adjustment expenses in the period of the change.

Our Consolidated Balance Sheet as of September 30, 2018 includes goodwill of acquired businesses of approximately $81 billion. We evaluate goodwill for impairment at least annually and we conducted our most recent annual review during the fourth quarter of 2017. Although we believe that the goodwill reflected in the accompanying Consolidated Balance Sheet is not impaired, goodwill may subsequently become impaired as a result of changes in facts and circumstances affecting the valuation of the reporting unit. A goodwill impairment charge could have a material effect on periodic earnings.

Our Consolidated Balance Sheets include derivative contract liabilities with respect to our equity index put option contracts. The fair values recorded for these liabilities are based on valuation models that utilize various inputs and assumptions that we believe are used by market participants. We further believe that fair values based on such models are inherently subjective and the values in an actual transaction may differ significantly from the model values. Changes in the assumptions utilized within the valuation models may have a significant effect on recorded fair values and periodic earnings.

Information concerning new accounting pronouncements is included in Note 2 to the accompanying Consolidated Financial Statements.

Forward-Looking Statements

Investors are cautioned that certain statements contained in this document as well as some statements in periodic press releases and some oral statements of Berkshire officials during presentations about Berkshire or its subsidiaries are “forward-looking” statements within the meaning of the Private Securities Litigation Reform Act of 1995 (the “Act”). Forward-looking statements include statements that are predictive in nature, which depend upon or refer to future events or conditions and may include words such as “expects,” “anticipates,” “intends,” “plans,” “believes,” “estimates” or similar expressions. In addition, any statements concerning future financial performance (including future revenues, earnings or growth rates), ongoing business strategies or prospects and possible future Berkshire actions, which may be provided by management, are also forward-looking statements as defined by the Act. Forward-looking statements are based on current expectations and projections about future events and are subject to risks, uncertainties and assumptions about Berkshire and its subsidiaries as well as economic and market factors and the industries in which we do business, among other things. These statements are not guarantees of future performance and we have no specific intention to update these statements.

Actual events and results may differ materially from those expressed or forecasted in forward-looking statements due to a number of factors. The important risk factors that could cause our actual performance and future events and actions to differ materially from such forward-looking statements include, but are not limited to, changes in market prices of our investments in fixed maturity and equity securities, losses realized from derivative contracts, the occurrence of one or more catastrophic events, such as an earthquake, hurricane, act of terrorism or cyber attack that causes losses insured by our insurance subsidiaries and/or losses to our business operations, changes in laws or regulations affecting our insurance, railroad, utilities and energy and finance subsidiaries, changes in federal income tax laws, and changes in general economic and market factors that affect the prices of securities or the industries in which we do business.

44

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Reference is made to Berkshire’s most recently issued Annual Report and in particular the “Market Risk Disclosures” included in “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” As of September 30, 2018, there were no material changes in the market risks described in Berkshire’s Annual Report on Form 10-K for the year ended December  31, 2017.

Item 4. Controls and Procedures

As of the end of the period covered by this Quarterly Report on Form 10-Q, the Company carried out an evaluation, under the supervision and with the participation of the Company’s management, including the Chairman (Chief Executive Officer) and the Senior Vice President (Chief Financial Officer), of the effectiveness of the design and operation of the Company’s disclosure controls and procedures pursuant to Exchange Act Rule 13a-15. Based upon that evaluation, the Chairman (Chief Executive Officer) and the Senior Vice President (Chief Financial Officer) concluded that the Company’s disclosure controls and procedures are effective in timely alerting them to material information relating to the Company (including its consolidated subsidiaries) required to be included in the Company’s periodic SEC filings. During the quarter, there have been no significant changes in the Company’s internal control over financial reporting or in other factors that could significantly affect internal control over financial reporting.

Part II Other Information

Item 1. Legal Proceedings

Berkshire and its subsidiaries are parties in a variety of legal actions that routinely arise out of the normal course of business, including legal actions seeking to establish liability directly through insurance contracts or indirectly through reinsurance contracts issued by Berkshire subsidiaries. Plaintiffs occasionally seek punitive or exemplary damages. We do not believe that such normal and routine litigation will have a material effect on our financial condition or results of operations. Berkshire and certain of its subsidiaries are also involved in other kinds of legal actions, some of which assert or may assert claims or seek to impose fines and penalties. We believe that any liability that may arise as a result of other pending legal actions will not have a material effect on our consolidated financial condition or results of operations.

Item 1A. Risk Factors

Our significant business risks are described in Item 1A to Form 10-K for the year ended December 31, 2017 to which reference is made herein.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds and Issuer Repurchases of Equity Securities

For several years, Berkshire had a common stock repurchase program, which permitted Berkshire to repurchase its Class A and Class B shares at prices no higher than a 20% premium over the book value of the shares. On July 17, 2018, Berkshire’s Board of Directors authorized an amendment to the program, permitting Berkshire to repurchase shares any time that Warren Buffett, Berkshire’s Chairman of the Board and Chief Executive Officer, and Charles Munger, a Vice-Chairman of the Board, believe that the repurchase price is below Berkshire’s intrinsic value, conservatively determined. Repurchases may be in the open market or through privately negotiated transactions. Information with respect to Berkshire’s Class A and Class B common stock repurchased during the third quarter of 2018 follows.

Period	Total number of shares purchased		Average price paid per share		Total number of shares purchased as part of publicly announced program		Maximum number or value of shares that yet may be repurchased under the program
August 7 through August 24:
Class A common stock		225		$312,806.74		225	*
Class B common stock		4,139,192		$207.09		4,139,192	*

* The program does not specify a maximum number of shares to be repurchased or obligate Berkshire to repurchase any specific dollar amount or number of Class A or Class B shares and there is no expiration date to the repurchase program. Berkshire will not repurchase its common stock if the repurchases reduce the total value of Berkshire’s consolidated cash, cash equivalents and U.S. Treasury Bills holdings to less than $20 billion.

45

Item 3. Defaults Upon Senior Securities

None

Item 4. Mine Safety Disclosures

Information regarding the Company’s mine safety violations and other legal matters disclosed in accordance with Section 1503(a) of the Dodd-Frank Reform Act is included in Exhibit 95 to this Form 10-Q.

Item 5. Other Information

None

Item 6. Exhibits

	a. Exhibits
3(i)	Restated Certificate of Incorporation          Incorporated by reference to Exhibit 3(i) to Form 10-K filed on March 2, 2015.
3(ii)	By-Laws          Incorporated by reference to Exhibit 3(ii) to Form 8-K filed on May 4, 2016.
12	Calculation of Ratio of Consolidated Earnings to Consolidated Fixed Charges
31.1	Rule 13a-14(a)/15d-14(a) Certifications
31.2	Rule 13a-14(a)/15d-14(a) Certifications
32.1	Section 1350 Certifications
32.2	Section 1350 Certifications
95	Mine Safety Disclosures
101	The following financial information from Berkshire Hathaway Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2018, formatted in XBRL (Extensible Business Reporting Language) includes: (i) the Consolidated Balance Sheets as of September 30, 2018 and December 31, 2017, (ii) the Consolidated Statements of Earnings for each of the three-month and nine-month periods ended September 30, 2018 and 2017, (iii) the Consolidated Statements of Comprehensive Income for each of the three-month and nine-month periods ended September 30, 2018 and 2017, (iv) the Consolidated Statements of Changes in Shareholders’ Equity for each of the nine-month periods ended September 30, 2018 and 2017, (v) the Consolidated Statements of Cash Flows for each of the nine-month periods ended September 30, 2018 and 2017, and (vi) the Notes to Consolidated Financial Statements, tagged in summary and detail.

SIGNATURE

Pursuant to the requirement of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned thereunto duly authorized.

	BERKSHIRE HATHAWAY INC.
	(Registrant)
Date: November 3, 2018	/S/ MARC D. HAMBURG
	(Signature)
	Marc D. Hamburg,
	Senior Vice President and
	Principal Financial Officer

46

EX-12

Exhibit 12

BERKSHIRE HATHAWAY INC.

Calculation of Ratio of Consolidated Earnings to Consolidated Fixed Charges

(Dollars in millions)

	Nine Months Ending			Year Ended December 31,
	September 30, 2018			2017		2016		2015		2014		2013
Net earnings attributable to Berkshire Hathaway shareholders(1)		$	29,413	$	44,940	$	24,074	$	24,083	$	19,872	$	19,476
Income tax expense (benefit)(1)			7,009		(21,515)		9,240		10,532		7,935		8,951
Earnings attributable to noncontrolling interests			300		413		353		331		298		369
Equity method net (earnings) losses			(1,044)		(2,938)		(923)		122		26		262
Dividends from equity method investments			830		797		952		366		—		—
Fixed charges			3,353		4,529		4,439		4,065		3,882		3,386
Earnings available for fixed charges		$	39,861	$	26,226	$	38,135	$	39,499	$	32,013	$	32,444
Fixed charges
Interest expense, including amortization(2)		$	2,882	$	3,927	$	3,741	$	3,446	$	3,253	$	2,801
Rentals representing interest and capitalized interest			471		602		698		619		629		585
		$	3,353	$	4,529	$	4,439	$	4,065	$	3,882	$	3,386
Ratio of earnings to fixed charges			11.89x		5.79x		8.59x		9.72x		8.25x		9.58x

  (1) Effective January 1, 2018, changes in the fair values of investments in equity securities are included in earnings, including unrealized gains and losses on securities still held. Berkshire’s earnings for the first nine months of 2018, included net pre-tax gains on investments in equity securities of approximately $12.4 billion ($9.8 billion after-tax), which was predominantly related to market value changes during the first nine months of 2018 on securities still held at September 30, 2018.

  (2) Includes recurring interest expense and excludes foreign currency exchange gains and losses related to Berkshire’s Euro denominated debt and losses from prepayments of debt.

EX-31.1

EXHIBIT 31.1

Quarter ended September 30, 2018

Rule 13a-14(a)/15d-14(a) Certifications

CERTIFICATIONS

I, Warren E. Buffett, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Berkshire Hathaway Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 3, 2018

/S/ WARREN E.  BUFFETT

             Chairman—Principal Executive Officer            

EX-31.2

EXHIBIT 31.2

Quarter ended September 30, 2018

Rule 13a-14(a)/15d-14(a) Certifications

CERTIFICATIONS

I, Marc D. Hamburg, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Berkshire Hathaway Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 3, 2018

/S/ MARC D.  HAMBURG

Senior Vice President—Principal Financial Officer

EX-32.1

EXHIBIT 32.1

Section 1350 Certifications

Quarter ended September 30, 2018

I, Warren E. Buffett, Chairman and Chief Executive Officer of Berkshire Hathaway Inc. (the “Company”), certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that to the best of my knowledge:

(1) the Quarterly Report on Form 10-Q of the Company for the period ended September 30, 2018 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: November 3, 2018

                             /S/ WARREN E. BUFFETT                                 

Warren E. Buffett

Chairman and Chief Executive Officer

EX-32.2

EXHIBIT 32.2

Section 1350 Certifications

Quarter ended September 30, 2018

I, Marc D. Hamburg, Senior Vice President and Chief Financial Officer of Berkshire Hathaway Inc. (the “Company”), certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that to the best of my knowledge:

(1) the Quarterly Report on Form 10-Q of the Company for the period ended September 30, 2018 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: November 3, 2018

             /S/ MARC D. HAMBURG

Marc D. Hamburg

        Senior Vice President and  Chief Financial Officer    

EX-95

EXHIBIT 95

MINE SAFETY VIOLATIONS AND OTHER LEGAL MATTER DISCLOSURES

PURSUANT TO SECTION 1503(a) OF THE DODD-FRANK WALL STREET

REFORM AND CONSUMER PROTECTION ACT

PacifiCorp and its subsidiaries operate coal mines and coal processing facilities and Acme Brick and its affiliates operate clay, shale and limestone excavation facilities (collectively, the “mining facilities”) that are regulated by the Federal Mine Safety and Health Administration (“MSHA”) under the Federal Mine Safety and Health Act of 1977 (the “Mine Safety Act”). MSHA inspects mining facilities on a regular basis. The total number of reportable Mine Safety Act citations, orders, assessments and legal actions for the three-month period ended September 30, 2018 are summarized in the table below and are subject to contest and appeal. The severity and assessment of penalties may be reduced or, in some cases, dismissed through the contest and appeal process. Amounts are reported regardless of whether PacifiCorp or Acme has challenged or appealed the matter. Mines that are closed or idled are not included in the information below if no reportable events occurred at those locations during the three-month period ended September 30, 2018. PacifiCorp and Acme have not received any notice of a pattern, or notice of the potential to have a pattern, of violations of mandatory health or safety standards that are of such nature as could have significantly and substantially contributed to the cause and effect of coal or other mine health or safety hazards under Section 104(e) of the Mine Safety Act during the three-month period ended September 30, 2018.

	Mine Safety Act										Total Value of Proposed MSHA Assessments     (in thousands)		Total Number of Mining Related     Fatalities		Legal Actions
Mining Facilities	Section 104 Significant and Substantial     Citations(1)		Section 104(b)     Orders(2)		Section 104(d) Citations/     Orders(3)		Section 110(b)(2)     Violations(4)		Section 107(a) Imminent Danger      Orders(5)						Pending as of Last Day of      Period(6)		Instituted During     Period		Resolved During     Period
Coal:
Bridger (surface)		—		—		—		—		—		$  —		—		—		—		—
Bridger (underground)		—		—		—		—		—		79		—		1		1		2
Wyodak Coal Crushing Facility		—		—		—		—		—		—		—		—		—		—
Clay, shale and limestone:
Malvern		—		—		—		—		—		—		—		—		—		—
Wheeler		—		—		—		—		—		—		—		—		—		—
Fort Smith		—		—		—		—		—		—		—		—		—		—
Oklahoma City		—		—		—		—		—		—		—		—		—		—
Tulsa		—		—		—		—		—		—		—		—		—		—
Denver		—		—		—		—		—		—		—		—		—		—
Bennett		—		—		—		—		—		—		—		—		—		—
Denton		—		—		—		—		—		—		—		—		—		—
Elgin		—		—		—		—		—		—		—		—		—		—
Sealy		—		—		—		—		—		—		—		—		—		—
Texas Clay		—		—		—		—		—		—		—		—		—		—
Leeds		—		—		—		—		—		—		—		—		—		—
Montgomery		—		—		—		—		—		—		—		—		—		—
Lueders		—		—		—		—		—		—		—		—		—		—
Cordova		—		—		—		—		—		—		—		—		—		—

(1) Citations for alleged violations of mandatory health and safety standards that could significantly or substantially contribute to the cause and effect of a safety or health hazard under Section 104 of the Mine Safety Act.

(2) For alleged failure to totally abate the subject matter of a Mine Safety Act Section 104(a) citation within the period specified in the citation.

(3) For alleged unwarrantable failure (i.e., aggravated conduct constituting more than ordinary negligence) to comply with a mandatory health or safety standard.

(4) For alleged flagrant violations (i.e., reckless or repeated failure to make reasonable efforts to eliminate a known violation of a mandatory health or safety standard that substantially and proximately caused, or reasonably could have been expected to cause, death or serious bodily injury).

(5) For the existence of any condition or practice in a coal or other mine which could reasonably be expected to cause death or serious physical harm before such condition or practice can be abated.

(6) Amounts include one contest of proposed penalties under Subpart C of the Federal Mine Safety and Health Review Commission’s procedural rules. The pending legal actions are not exclusive to citations, notices, orders and penalties assessed by MSHA during the reporting period.

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 25, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	BRKA
Entity Registrant Name	BERKSHIRE HATHAWAY INC.
Entity Central Index Key	0001067983
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		733,152
Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,362,792,906

XML

Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2018		Dec. 31, 2017
ASSETS
Investments in fixed maturity securities		$ 18,271		$ 21,353
Investments in equity securities		207,332	[1]	170,540	[2]
Inventories		16,793		16,187
Goodwill		81,327		81,258
Deferred charges under retroactive reinsurance contracts		14,451		15,278
Total assets		736,459		702,095
LIABILITIES
Income taxes, principally deferred		59,340		56,607
Unpaid losses and loss adjustment expenses		64,263		61,122
Unpaid losses and loss adjustment expenses under retroactive reinsurance contracts		41,935		42,937
Total liabilities		357,040		350,141
Shareholders' equity:
Common stock		8		8
Capital in excess of par value		35,713		35,694
Accumulated other comprehensive income		(3,927)		58,571
Retained earnings		346,503		255,786
Treasury stock, at cost		(2,691)		(1,763)
Berkshire Hathaway shareholders' equity		375,606		348,296
Noncontrolling interests		3,813		3,658
Total shareholders' equity		379,419		351,954
Total liabilities and shareholders' equity		736,459		702,095
Insurance and Other [Member]
ASSETS
Cash and cash equivalents	[3]	36,506		25,460
Short-term investments in U.S. Treasury Bills		59,947		78,515
Investments in fixed maturity securities		18,271		21,353
Investments in equity securities		201,226		164,026
Investment in The Kraft Heinz Company		17,453		17,635
Receivables		31,884		28,578
Inventories		16,793		16,187
Property, plant and equipment		24,357		20,104
Goodwill		54,985		54,985
Other intangible assets		31,626		32,518
Deferred charges under retroactive reinsurance contracts		14,451		15,278
Other		13,250		11,158
Total assets		520,749		485,797
LIABILITIES
Unpaid losses and loss adjustment expenses		64,263		61,122
Unpaid losses and loss adjustment expenses under retroactive reinsurance contracts		41,935		42,937
Unearned premiums		19,011		16,040
Life, annuity and health insurance benefits		18,368		17,608
Other policyholder liabilities		6,692		7,654
Accounts payable, accruals and other liabilities		27,178		23,099
Notes payable and other borrowings		24,271		27,324
Total liabilities		201,718		195,784
Railroad, Utilities and Energy [Member]
ASSETS
Cash and cash equivalents	[3]	3,297		2,910
Property, plant and equipment		130,387		128,184
Goodwill		24,790		24,780
Regulatory assets		2,928		2,950
Other		16,020		15,589
Total assets		177,422		174,413
LIABILITIES
Accounts payable, accruals and other liabilities		11,269		11,334
Regulatory liabilities		7,723		7,511
Notes payable and other borrowings		62,599		62,178
Total liabilities		81,591		81,023
Finance and Financial Products [Member]
ASSETS
Cash and cash equivalents	[3]	1,635		3,213
Short-term investments in U.S. Treasury Bills		2,258		5,856
Loans and finance receivables		14,477		13,748
Property, plant and equipment and assets held for lease		10,273		9,931
Goodwill		1,552		1,493
Other		8,093		7,644
Total assets		38,288		41,885
LIABILITIES
Accounts payable, accruals and other liabilities		1,752		1,470
Derivative contract liabilities		1,869		2,172
Notes payable and other borrowings		10,770		13,085
Total liabilities		$ 14,391		$ 16,727

[1] Approximately 69% of the aggregate fair value was concentrated in five companies (American Express Company - $16.1 billion; Apple Inc. - $57.6 billion; Bank of America Corporation - $26.5 billion; The Coca-Cola Company - $18.5 billion and Wells Fargo & Company - $24.4 billion).

[2] Approximately 65% of the aggregate fair value was concentrated in five companies (American Express Company - $15.1 billion; Apple Inc. - $28.2 billion; Bank of America Corporation - $20.7 billion; The Coca-Cola Company - $18.4 billion and Wells Fargo & Company - $29.3 billion).

[3] Cash and cash equivalents includes U.S. Treasury Bills with maturities of three months or less when purchased of $14.7 billion at September 30, 2018 and $5.7 billion at December 31, 2017.

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Billions	Sep. 30, 2018	Dec. 31, 2017
U.S. Treasury Bills [Member]
Cash equivalents	$ 14.7	$ 5.7

XML

Consolidated Statements of Earnings - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Sales and service revenues		$ 45,427		$ 131,191
Total revenues		63,450	$ 59,507	184,123	$ 181,133
Investment and derivative contract gains/losses:
Investments gains (losses)		14,569	657	12,750	1,262
Derivative contract gains (losses)		137	308	303	703
Investment and derivative gains/losses		14,706	965	13,053	1,965
Costs and expenses:
Total costs and expenses		55,325	55,147	161,498	166,583
Earnings before income taxes and equity method earnings		22,831	5,325	35,678	16,515
Equity method earnings		316	305	1,044	932
Earnings before income taxes		23,147	5,630	36,722	17,447
Income tax expense		4,440	1,427	7,009	4,750
Net earnings		18,707	4,203	29,713	12,697
Earnings attributable to noncontrolling interests		167	136	300	308
Net earnings attributable to Berkshire Hathaway shareholders		$ 18,540	$ 4,067	$ 29,413	$ 12,389
Equivalent Class A [Member]
Net earnings (loss) per share attributable to Berkshire Hathaway shareholders:
Net earnings per average equivalent share	[1]	$ 11,280	$ 2,473	$ 17,885	$ 7,533
Equivalent Class B [Member]
Net earnings (loss) per share attributable to Berkshire Hathaway shareholders:
Net earnings per average equivalent share	[1]	$ 7.52	$ 1.65	$ 11.92	$ 5.02
Class A [Member]
Net earnings (loss) per share attributable to Berkshire Hathaway shareholders:
Average shares outstanding		736,262	756,528	744,126	766,245
Class B [Member]
Net earnings (loss) per share attributable to Berkshire Hathaway shareholders:
Average shares outstanding		1,360,940,890	1,332,192,917	1,350,588,758	1,317,463,821
Insurance and Other [Member]
Revenues:
Insurance premiums earned		$ 14,333	$ 13,349	$ 41,855	$ 47,469
Sales and service revenues		33,249	32,055	98,128	94,017
Interest, dividend and other investment income		1,619	1,320	4,468	3,804
Total revenues		49,201	46,724	144,451	145,290
Costs and expenses:
Insurance losses and loss adjustment expenses		9,932	12,137	28,296	39,450
Life, annuity and health insurance benefits		1,448	1,213	4,153	3,703
Insurance underwriting expenses		2,352	2,207	7,079	6,924
Cost of sales and services		26,789	25,815	78,684	75,594
Selling, general and administrative expenses		3,984	3,965	12,158	12,101
Interest expense and other		116	435	246	1,405
Total costs and expenses		44,621	45,772	130,616	139,177
Railroad, Utilities and Energy [Member]
Revenues:
Total revenues		11,818	10,633	32,815	29,833
Costs and expenses:
Cost of sales and operating expenses		8,087	6,984	23,451	20,678
Interest expense		698	700	2,110	2,090
Total costs and expenses		8,785	7,684	25,561	22,768
Finance and Financial Products [Member]
Revenues:
Sales and service revenues		2,057	1,790	5,742	4,936
Interest, dividend and other investment income		374	360	1,115	1,074
Total revenues		2,431	2,150	6,857	6,010
Costs and expenses:
Cost of sales and services		1,273	1,062	3,519	2,891
Selling, general and administrative expenses		564	531	1,549	1,442
Interest expense		82	98	253	305
Total costs and expenses		$ 1,919	$ 1,691	$ 5,321	$ 4,638

[1] Class B shares are economically equivalent to one-fifteen-hundredth of a Class A share. Accordingly, net earnings per average equivalent Class B share outstanding is equal to one-fifteen-hundredth of the equivalent Class A amount. See Note 19.

XML

Consolidated Statements of Earnings (Parenthetical)	9 Months Ended
	Sep. 30, 2018
Class B [Member]
Economic equivalent of Class B share to Class A share	0.0667%

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 18,707	$ 4,203	$ 29,713	$ 12,697
Other comprehensive income:
Net change in unrealized appreciation of investments	5	4,952	(132)	18,040
Applicable income taxes	(1)	(1,716)	19	(6,247)
Reclassification of investment appreciation in net earnings	(34)	(646)	(299)	(1,235)
Applicable income taxes	7	226	63	432
Foreign currency translation	(79)	771	(842)	2,127
Applicable income taxes	9	(24)	46	(116)
Prior service cost and actuarial gains/losses of defined benefit pension plans	(13)	(3)	50	(57)
Applicable income taxes	3	6		31
Other, net	(21)	32	(57)	38
Other comprehensive income, net	(124)	3,598	(1,152)	13,013
Comprehensive income	18,583	7,801	28,561	25,710
Comprehensive income attributable to noncontrolling interests	162	203	271	436
Comprehensive income attributable to Berkshire Hathaway shareholders	$ 18,421	$ 7,598	$ 28,290	$ 25,274

XML

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Common stock and capital in excess of par value	Accumulated other comprehensive income	Retained earnings	Treasury stock	Noncontrolling interests
Beginning Balance at Dec. 31, 2016	$ 285,428	$ 35,689	$ 37,298	$ 210,846	$ (1,763)	$ 3,358
Net earnings	12,697			12,389		308
Other comprehensive income, net	13,013		12,885			128
Issuance of common stock	58	58
Transactions with noncontrolling interests	(275)	(55)				(220)
Ending Balance at Sep. 30, 2017	310,921	35,692	50,183	223,235	(1,763)	3,574
Beginning Balance at Dec. 31, 2017	351,954	35,702	58,571	255,786	(1,763)	3,658
Adoption of new accounting pronouncements	(71)		(61,375)	61,304
Net earnings	29,713			29,413		300
Other comprehensive income, net	(1,152)		(1,123)			(29)
Issuance (acquisition) of common stock	(874)	54			(928)
Transactions with noncontrolling interests	(151)	(35)				(116)
Ending Balance at Sep. 30, 2018	$ 379,419	$ 35,721	$ (3,927)	$ 346,503	$ (2,691)	$ 3,813

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Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017
Cash flows from operating activities:
Net earnings	$ 29,713		$ 12,697
Adjustments to reconcile net earnings to operating cash flows:
Investment gains/losses	(12,750)		(1,262)
Depreciation and amortization	7,169		6,835
Other	(677)		1,110
Changes in operating assets and liabilities:
Losses and loss adjustment expenses	2,272		22,615
Deferred charges reinsurance assumed	827		(5,525)
Unearned premiums	2,974		2,253
Receivables and originated loans	(4,781)		(2,890)
Other assets	(1,788)		(1,287)
Other liabilities	805		360
Income taxes	2,791		2,593
Net cash flows from operating activities	26,555		37,499
Cash flows from investing activities:
Purchases of U.S. Treasury Bills and fixed maturity securities	(85,502)		(106,597)
Purchases of equity securities	(38,552)		(14,936)
Sales of U.S. Treasury Bills and fixed maturity securities	26,903		35,143
Redemptions and maturities of U.S. Treasury Bills and fixed maturity securities	83,742		65,666
Sales and redemptions of equity securities	14,164		10,572
Purchases of loans and finance receivables	(1,748)		(1,392)
Collections of loans and finance receivables	266		1,599
Acquisitions of businesses, net of cash acquired	(521)		(2,640)
Purchases of property, plant and equipment	(10,040)		(8,411)
Other	257		(150)
Net cash flows from investing activities	(11,031)		(21,146)
Cash flows from financing activities:
Changes in short term borrowings, net	(2,754)		122
Acquisition of treasury stock	(928)
Other	(277)		(108)
Net cash flows from financing activities	(5,526)		(1,867)
Effects of foreign currency exchange rate changes	(109)		222
Increase in cash and cash equivalents and restricted cash	9,889		14,708
Cash and cash equivalents and restricted cash:
Cash and cash equivalents and restricted cash at beginning of year	32,212		28,643
Cash and cash equivalents and restricted cash at end of third quarter	42,101		43,351
Restricted cash, included in other assets at beginning of year	629		595
Restricted cash, included in other assets at end of third quarter	663		645
Insurance and Other [Member]
Cash flows from financing activities:
Proceeds from borrowings	55		1,321
Repayments of borrowings	(2,661)		(1,763)
Cash and cash equivalents and restricted cash:
Cash and cash equivalents at beginning of year	25,460	[1]	23,581
Cash and cash equivalents at end of third quarter	36,506	[1]	35,247
Railroad, Utilities and Energy [Member]
Cash flows from financing activities:
Proceeds from borrowings	7,019		2,812
Repayments of borrowings	(3,658)		(1,944)
Cash and cash equivalents and restricted cash:
Cash and cash equivalents at beginning of year	2,910	[1]	3,939
Cash and cash equivalents at end of third quarter	3,297	[1]	4,448
Finance and Financial Products [Member]
Cash flows from financing activities:
Proceeds from borrowings	2,339		1,298
Repayments of borrowings	(4,661)		(3,605)
Cash and cash equivalents and restricted cash:
Cash and cash equivalents at beginning of year	3,213	[1]	528
Cash and cash equivalents at end of third quarter	$ 1,635	[1]	$ 3,011

[1] Cash and cash equivalents includes U.S. Treasury Bills with maturities of three months or less when purchased of $14.7 billion at September 30, 2018 and $5.7 billion at December 31, 2017.

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General

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

General

Note 1. General

The accompanying unaudited Consolidated Financial Statements include the accounts of Berkshire Hathaway Inc. (“Berkshire” or “Company”) consolidated with the accounts of all its subsidiaries and affiliates in which Berkshire holds controlling financial interests as of the financial statement date. In these notes, the terms “us,” “we” or “our” refer to Berkshire and its consolidated subsidiaries. Reference is made to Berkshire’s most recently issued Annual Report on Form 10-K (“Annual Report”), which includes information necessary or useful to understanding Berkshire’s businesses and financial statement presentations. Our significant accounting policies and practices were presented as Note 1 to the Consolidated Financial Statements included in the Annual Report. Changes to those policies due to the adoption of new accounting standards effective January 1, 2018 are described in Note 2. Certain immaterial amounts related to equity method earnings were reclassified in the accompanying 2017 Consolidated Financial Statements to conform to current presentations.

Financial information in this Quarterly Report reflects all adjustments (consisting only of normal recurring adjustments) that are, in the opinion of management, necessary to a fair statement of results for the interim periods in accordance with accounting principles generally accepted in the United States (“GAAP”). For a number of reasons, our results for interim periods are not normally indicative of results to be expected for the year. The timing and magnitude of catastrophe losses incurred by insurance subsidiaries and the estimation error inherent to the process of determining liabilities for unpaid losses of insurance subsidiaries can be more significant to results of interim periods than to results for a full year. Changes in market prices of the equity securities we own can produce significant effects on our consolidated shareholders’ equity. Beginning in 2018, those effects are included in our Consolidated Statements of Earnings, whereas in pre-2018 periods, such effects were included in other comprehensive income. In addition, changes in the fair values of certain derivative contract liabilities and gains and losses from the periodic revaluation of certain assets and liabilities denominated in foreign currencies can cause significant variations in our periodic net earnings.

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New Accounting Pronouncements

9 Months Ended

Sep. 30, 2018

Accounting Changes and Error Corrections [Abstract]

New Accounting Pronouncements

Note 2. New Accounting Pronouncements

On January 1, 2018, we adopted Accounting Standards Update (“ASU”) 2016-01 “Financial Instruments—Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”), ASU 2018-02 “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” (“ASU 2018-02”) and Accounting Standards Codification (“ASC”) 606 – “Revenues from Contracts with Customers” (“ASC 606”). A summary of the effects of the initial adoption of ASU 2016-01, ASU 2018-02 and ASC 606 follows (in millions).

	ASU 2016-01		ASU 2018-02		ASC 606		Total
Increase (decrease):
Assets	$	—	$	—	$	3,382	$	3,382
Liabilities		—		—		3,453		3,453
Accumulated other comprehensive income		(61,459)		84		—		(61,375)
Retained earnings		61,459		(84)		(71)		61,304
Shareholders’ equity		—		—		(71)		(71)

With respect to ASU 2016-01, beginning in 2018, we are including unrealized gains and losses arising from the changes in the fair values of our equity securities during the period as a component of investment gains in the Consolidated Statements of Earnings. For periods ending prior to January 1, 2018, we recognized gains and losses in earnings when we sold equity securities, based on the difference between the sale proceeds and the cost of the securities, and for other-than-temporary impairment losses. We recorded unrealized gains and losses from the changes in fair value of available-for-sale equity securities in other comprehensive income. We continue to carry our investments in equity securities at fair value and there is no change to the asset values or total shareholders’ equity amounts we would have otherwise recorded. ASU 2016-01prohibited the restatement of prior year financial statements. However, as of January 1, 2018, we reclassified net after-tax unrealized gains on equity securities from accumulated other comprehensive income to retained earnings.

In connection with our adoption of ASU 2018-02, we reclassified the stranded deferred income tax effects that were included in accumulated other comprehensive income as of January 1, 2018 to retained earnings. These stranded income tax effects arose from the reduction in the U.S. statutory income tax rate under the U.S. Tax Cuts and Jobs Act enacted on December 22, 2017. The effect of the reduction in the statutory income tax rate on accumulated other comprehensive income items was recorded in earnings in December 2017. Prior year financial statements were not restated.

We adopted ASC 606 using the modified retrospective method, whereby the cumulative effect of the adoption was recorded as an adjustment to retained earnings. Prior year financial statements were not restated. The initial adoption of ASC 606 as of January 1, 2018 resulted in increases to assets and other liabilities, with a relatively minor reduction in retained earnings. Prior to January 1, 2018, we recognized revenues from the sales of fractional ownership interests in aircraft over the term of the related management services agreements, as the transfers of the ownership interests were inseparable from the management services agreements. These agreements also include provisions that require us to repurchase the fractional interest at fair market value at contract termination or upon the customer’s request following the end of a minimum commitment period. ASC 606 provides that such contracts are subject to accounting guidance for lease contracts and not ASC 606. The principal effects of this re-characterization were to increase both property, plant and equipment and other liabilities by approximately $3.5 billion. The re-characterization of these fractional ownership interests as operating leases did not have a material effect on our consolidated revenues or earnings for the first nine months of 2018.

In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-02 “Leases,” which together with subsequent amendments is included in ASC 842. Most significantly, ASC 842 requires a lessee to recognize a liability to make lease payments and an asset with respect to its right to use the underlying asset for the lease term. ASC 842 also addresses accounting and reporting by lessors, which is not significantly different from current accounting and reporting, and further provides for qualitative and quantitative disclosures. We intend to adopt ASC 842 as of January 1, 2019 under the modified retrospective method.

We are party to contracts where we are the lessee and other contracts where we are the lessor. For contracts where we are the lessee, we will record lease liabilities and right of use assets for contracts in effect on January 1, 2019 based on the facts and circumstances as of that date. While we continue to evaluate certain provisions of ASC 842, based on our current estimates, we expect to recognize right of use assets and lessee lease liabilities of approximately $6 billion with respect to operating leases. We do not believe the adoption of ASC 842 will have a material effect on our consolidated financial position, results of operations or cash flows.

In June 2016, the FASB issued ASU 2016-13 “Financial Instruments—Credit Losses,” which provides for the recognition and measurement at the reporting date of all expected credit losses for financial assets held at amortized cost and available-for-sale debt securities. Currently, credit losses are recognized and measured when such losses become probable based on the prevailing facts and circumstances. ASU 2016-13 is effective for reporting periods beginning after December 15, 2019. We are currently evaluating the effect this standard will have on our Consolidated Financial Statements.

In January 2017, the FASB issued ASU 2017-04 “Simplifying the Test for Goodwill Impairment.” ASU 2017-04 eliminates the requirement to determine the implied value of goodwill in measuring an impairment loss. Upon adoption of ASU 2017-04, the measurement of a goodwill impairment will represent the excess of the reporting unit’s carrying value over fair value, limited to the carrying value of goodwill. ASU 2017-04 is effective for goodwill impairment tests in fiscal years beginning after December 15, 2019, with early adoption permitted.

In August 2018, the FASB issued ASU 2018-12 “Targeted Improvements to the Accounting for Long-Duration Contracts.” ASU 2018-12 requires periodic reassessment of actuarial and discount rate assumptions used in the valuation of policyholder liabilities and deferred acquisition costs arising from the issuance of long-duration insurance and reinsurance contracts, with the effects of changes in cash flow assumptions reflected in earnings and the effects of changes in discount rate assumptions reflected in other comprehensive income. Under current accounting guidance, the actuarial and discount rate assumptions are set at the contract inception date and not subsequently changed, except under limited circumstances. ASU 2018-12 also requires new disclosures and is effective for fiscal years beginning after December 15, 2020, with early adoption permitted. We are evaluating the effect this standard will have on our Consolidated Financial Statements.

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Revenues from contracts with customers

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenues from contracts with customers

Note 3. Revenues from contracts with customers

As discussed in Note 2, on January 1, 2018, we adopted ASC 606 “Revenues from Contracts with Customers.” Except as described in Note 2, our revenue recognition practices for contracts with customers under ASC 606 do not differ significantly from prior practices. Under ASC 606, revenues are recognized when a good or service is transferred to a customer. A good or service is transferred when (or as) the customer obtains control of that good or service. Revenues are based on the consideration we expect to receive in connection with our promises to deliver goods and services to our customers. Our accounting policies related to revenue from contracts with customers follow.

We manufacture and/or distribute a wide variety of industrial, building and consumer products. Our sales contracts provide customers with these products through wholesale and retail channels in exchange for consideration specified under the contracts. Contracts generally represent customer orders for individual products at stated prices. Sales contracts may contain either single or multiple performance obligations. In instances where contracts contain multiple performance obligations, we allocate the revenue to each obligation based on the relative stand-alone selling prices of each product or service.

Sales revenue reflects reductions for returns, allowances, volume discounts and other incentives, some of which may be contingent on future events. In certain customer contracts of our grocery distribution business, sales revenue includes certain state and local excise taxes billed to customers on specified products when those taxes are levied directly upon us by the taxing authorities. Sales revenue excludes sales taxes and value-added taxes collected on behalf of taxing authorities. Sales revenue includes consideration for shipping and other fulfillment activities performed prior to the customer obtaining control of the goods. We also elect to treat consideration for such services performed after control has passed to the customer as sales revenue.

Our product sales revenues are generally recognized at a point in time when control of the product transfers to the customer, which coincides with customer pickup or product delivery or acceptance, depending on terms of the arrangement. We recognize sales revenues and related costs with respect to certain contracts over time, primarily from certain castings, forgings and aerostructures contracts. Control of the product units under these contracts transfers continuously to the customer as the product is manufactured. These products generally have no alternative use and the contract requires the customer to provide reasonable compensation if terminated for reasons other than breach of contract.

Our energy revenue derives primarily from tariff based sales arrangements approved by various regulatory bodies. These tariff based revenues are mainly comprised of energy, transmission, distribution and natural gas and have performance obligations to deliver energy products and services to customers which are satisfied over time as energy is delivered or services are provided. Our nonregulated energy revenue primarily relates to our renewable energy business. Energy revenues are equivalent to the amounts we have the right to invoice and correspond directly with the value to the customer of the performance to date and include billed and unbilled amounts. As of September 30, 2018 and December 31, 2017, trade receivables were approximately $2.2 billion and $2.0 billion, respectively, and were included in other assets of our railroad, utilities and energy businesses on the Consolidated Balance Sheets. Such amounts substantially relate to customer revenue and included unbilled revenue of $624 million as of September 30, 2018 and $665 million as of December 31, 2017. Payments from customers are generally due from the customer within 30 days of billing. Rates charged for energy products and services are established by regulators or contractual arrangements that establish the transaction price, as well as the allocation of price amongst the separate performance obligations. When preliminary regulated rates are permitted to be billed prior to final approval by the applicable regulator, certain revenue collected may be subject to refund and a liability for estimated refunds is accrued.

The primary performance obligation under our freight rail transportation service contracts is to move freight from a point of origin to a point of destination. The performance obligations are represented by bills of lading which create a series of distinct services that have a similar pattern of transfer to the customer. The revenues for each performance obligation are based on various factors including the product being shipped, the origin and destination pair, and contract incentives which are outlined in various private rate agreements, common carrier public tariffs, interline foreign road agreements and pricing quotes. The transaction price is generally a per car amount to transport railcars from a specified origin to a specified destination. Freight revenues are recognized over time as the service is performed because the customer simultaneously receives and consumes the benefits of the service. Revenues recognized represent the proportion of the service completed as of the balance sheet date. Receivables related to customer contracts were approximately $1.3 billion at September 30, 2018 and $1.2 billion at December 31, 2017 and were included in other assets of our railroad, utilities and energy businesses. Invoices for freight transportation services are generally issued to customers and paid within thirty days or less. Customer incentives, which are primarily provided for shipping a specified cumulative volume or shipping to/from specific locations, are recorded as a reduction to revenue on a pro-rata basis based on actual or projected future customer shipments.

Other service revenues derive from contracts with customers in which performance obligations are satisfied over time, where customers receive and consume benefits as we perform the services, or at a point in time when the services are provided. Other service revenues primarily derive from real estate brokerage, automotive repair, aircraft management, aviation training, franchising and news distribution services.

The following table summarizes customer contract revenues disaggregated by reportable segment and the source of the revenue for the three and nine months ending September 30, 2018 (in millions). Other revenues included in our consolidated revenues were primarily insurance premiums earned, interest, dividend and other investment income and lease income which are not within the scope of ASC 606.

	Manufacturing		McLane     Company		Service and Retail		BNSF		Berkshire Hathaway Energy		Finance and Financial Products		Insurance, Corporate and other		Total
Three months ending September 30, 2018
Manufactured products:
Industrial and commercial products	$	6,384	$	—	$	47	$	—	$	—	$	82	$	—	$	6,513
Building products		3,473		—		—		—		—		4		—		3,477
Consumer products		2,838		—		—		—		—		1,170		—		4,008
Grocery and convenience store distribution		—		8,709		—		—		—		—		—		8,709
Food and beverage distribution		—		4,079		—		—		—		—		—		4,079
Auto sales		—		—		2,083		—		—		—		—		2,083
Other retail and wholesale distribution		521		—		3,117		—		—		23		—		3,661
Service		262		16		965		6,099		1,140		148		—		8,630
Electricity and natural gas		—		—		—		—		4,267		—		—		4,267
Total		13,478		12,804		6,212		6,099		5,407		1,427		—		45,427
Other revenue		51		18		743		13		299		1,004		15,895		18,023
	$	13,529	$	12,822	$	6,955	$	6,112	$	5,706	$	2,431	$	15,895	$	63,450
	Manufacturing		McLane Company		Service and Retail		BNSF		Berkshire Hathaway Energy		Finance and Financial Products		Insurance, Corporate and other		Total
Nine months ending September 30, 2018
Manufactured products:
Industrial and commercial products	$	19,306	$	—	$	155	$	—	$	—	$	503	$	—	$	19,964
Building products		9,817		—		—		—		—		11		—		9,828
Consumer products		8,734		—		—		—		—		3,124		—		11,858
Grocery and convenience store distribution		—		25,128		—		—		—		—		—		25,128
Food and beverage distribution		—		12,203		—		—		—		—		—		12,203
Auto sales		—		—		6,087		—		—		—		—		6,087
Other retail and wholesale distribution		1,533		—		8,734		—		—		65		—		10,332
Service		759		53		2,912		17,510		3,026		174		—		24,434
Electricity and natural gas		—		—		—		—		11,357		—		—		11,357
Total		40,149		37,384		17,888		17,510		14,383		3,877		—		131,191
Other revenue		132		54		2,664		37		885		2,980		46,180		52,932
	$	40,281	$	37,438	$	20,552	$	17,547	$	15,268	$	6,857	$	46,180	$	184,123

A summary of the transaction price allocated to the significant unsatisfied remaining performance obligations relating to contracts with expected durations in excess of one year as of September 30, 2018 follows (in millions).

	Performance obligations     expected to be satisfied:
	Less than 12 months		Greater than 12 months		Total
Manufactured products:
Industrial and commercial products	$	50	$	2,549	$	2,599
Electricity and natural gas		1,011		5,879		6,890

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Investments in fixed maturity securities

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Investments in fixed maturity securities

Note 4. Investments in fixed maturity securities

Our investments in fixed maturity securities as of September 30, 2018 and December 31, 2017 are summarized by type below (in millions).

	Amortized   Cost		Unrealized Gains		Unrealized Losses		Fair     Value
September 30, 2018
U.S. Treasury, U.S. government corporations and agencies	$	3,626	$	8	$	(35)	$	3,599
U.S. states, municipalities and political subdivisions		276		15		(1)		290
Foreign governments		7,362		45		(37)		7,370
Corporate bonds		6,029		436		(7)		6,458
Mortgage-backed securities		502		56		(4)		554
	$	17,795	$	560	$	(84)	$	18,271
December 31, 2017
U.S. Treasury, U.S. government corporations and agencies	$	3,975	$	4	$	(26)	$	3,953
U.S. states, municipalities and political subdivisions		847		19		(12)		854
Foreign governments		8,572		274		(24)		8,822
Corporate bonds		6,279		588		(5)		6,862
Mortgage-backed securities		772		92		(2)		862
	$	20,445	$	977	$	(69)	$	21,353

Investments in foreign government securities include securities issued by national and provincial government entities as well as instruments that are unconditionally guaranteed by such entities. As of September 30, 2018, approximately 89% of foreign government holdings were rated AA or higher by at least one of the major rating agencies.

The amortized cost and estimated fair value of fixed maturity securities at September 30, 2018 are summarized below by contractual maturity dates. Amounts are in millions. Actual maturities may differ from contractual maturities due to early call or prepayment rights held by issuers.

	Due in one   year or less		Due after one year through five years		Due after five years through ten years		Due after     ten years		Mortgage- backed     securities		Total
Amortized cost	$	7,275	$	9,057	$	387	$	574	$	502	$	17,795
Fair value		7,274		9,108		435		900		554		18,271

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Investments in equity securities

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Investments in equity securities

Note 5. Investments in equity securities

Our investments in equity securities as of September 30, 2018 and December 31, 2017 are summarized based on the primary industry of the investee as follows (in millions).

	Cost Basis		Net Unrealized Gains		Fair     Value
September 30, 2018 *
Banks, insurance and finance	$	42,010	$	51,499	$	93,509
Consumer products		38,793		39,858		78,651
Commercial, industrial and other		21,035		14,137		35,172
	$	101,838	$	105,494	$	207,332

* Approximately 69% of the aggregate fair value was concentrated in five companies (American Express Company – $16.1 billion; Apple Inc. – $57.6 billion; Bank of America Corporation – $26.5 billion; The Coca-Cola Company – $18.5 billion and Wells Fargo & Company – $24.4 billion).

	Cost Basis		Net Unrealized Gains		Fair         Value
December 31, 2017 *
Banks, insurance and finance	$	25,783	$	55,026	$	80,809
Consumer products		25,177		25,698		50,875
Commercial, industrial and other		23,716		15,140		38,856
	$	74,676	$	95,864	$	170,540

* Approximately 65% of the aggregate fair value was concentrated in five companies (American Express Company – $15.1 billion; Apple Inc. – $28.2 billion; Bank of America Corporation – $20.7 billion; The Coca-Cola Company – $18.4 billion and Wells Fargo & Company – $29.3 billion).

Investments in equity securities are reflected in our Consolidated Balance Sheets as follows (in millions).

	September 30,     2018		December 31,     2017
Insurance and other	$	201,226	$	164,026
Railroad, utilities and energy *		1,616		1,961
Finance and financial products *		4,490		4,553
	$	207,332	$	170,540

* Included in other assets.

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Equity Method Investments

9 Months Ended

Sep. 30, 2018

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments

Note 6. Equity Method Investments

Berkshire holds investments in certain businesses that are accounted for pursuant to the equity method. Currently, the most significant of these is our investment in the common stock of The Kraft Heinz Company (“Kraft Heinz”). Kraft Heinz is one of the world’s largest manufacturers and marketers of food and beverage products, including condiments and sauces, cheese and dairy, meals, meats, refreshment beverages, coffee and other grocery products. Berkshire currently owns 325,442,152 shares of Kraft Heinz common stock representing 26.7% of the outstanding shares. The carrying value and fair value of this investment at September 30, 2018 was approximately $17.5 billion and $17.9 billion, respectively, and at December 31, 2017 was $17.6 billion and $25.3 billion, respectively. Our earnings determined under the equity method during the first nine months of 2018 and 2017 were $635 million and $800 million, respectively. We received dividends on the common stock of $610 million in the first nine months of 2018 and $594 million in the first nine months of 2017, which we recorded as reductions of our investment.

Summarized consolidated financial information of Kraft Heinz follows (in millions).

					September 29,   2018		December 30,   2017
Assets					$	119,730	$	120,232
Liabilities						54,152		53,985
	Third Quarter				First Nine Months
	2018		2017		2018		2017
Sales	$	6,378	$	6,280	$	19,368	$	19,241
Net earnings attributable to Kraft Heinz common shareholders	$	630	$	944	$	2,379	$	2,996

Other investments accounted for pursuant to the equity method include our investments in Berkadia Commercial Mortgage LLC (“Berkadia”), Pilot Travel Centers LLC, d/b/a Pilot Flying J (“Pilot Flying J”), and Electric Transmission Texas, LLC (“ETT”). Our investments in these entities were approximately $3.6 billion as of September 30, 2018 and $3.4 billion as of December 31, 2017 and were included in other assets. Our equity method earnings in these entities for the first nine months were $409 million in 2018 and $132 million in 2017. Additional information concerning these investments follows.

We own a 50% interest in Berkadia with Jefferies Financial Group Inc. (“Jefferies”), formerly known as Leucadia National Corporation, owning the other 50% interest. Berkadia is a servicer of commercial real estate loans in the U.S., performing primary, master and special servicing functions for U.S. government agency programs, commercial mortgage-backed securities transactions, banks, insurance companies and other financial institutions. A source of funding for Berkadia’s operations is through its issuance of commercial paper, which is currently limited to $1.5 billion. The commercial paper is supported by a surety policy issued by a Berkshire insurance subsidiary. Jefferies is obligated to indemnify us for one-half of any losses incurred under the policy. In addition, a Berkshire Hathaway Energy Company subsidiary owns a 50% interest in ETT, an owner and operator of electric transmission assets in the Electric Reliability Council of Texas footprint. American Electric Power owns the other 50% interest.

On October 3, 2017, we entered into an investment agreement and an equity purchase agreement whereby we acquired a 38.6% interest in Pilot Flying J, headquartered in Knoxville, Tennessee. Pilot Flying J is one of the largest operators of travel centers in North America, with more than 28,000 team members, 750 locations across the U.S. and Canada and more than $20 billion in annual revenues. The Haslam family currently owns a 50.1% interest in Pilot Flying J and a third party owns the remaining 11.3% interest. We also entered into an agreement to acquire in 2023 an additional 41.4% interest in Pilot Flying J with the Haslam family retaining a 20% interest. As a result, Berkshire will become the majority owner of Pilot Flying J in 2023.

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Income taxes

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Income taxes

Note 7. Income taxes

Our consolidated effective income tax rates for the third quarter and first nine months of 2018 were 19.2% and 19.1%, respectively, and 25.3% and 27.2% in the third quarter and first nine months of 2017, respectively. Our effective income tax rate normally reflects recurring benefits from: (a) dividends received deductions applicable to certain investments in equity securities and (b) income production tax credits related to wind-powered electricity generation placed in service in the U.S. In 2018, our effective income tax rate reflects the current U.S. statutory rate of 21%, while the rate for 2017 reflects the then current U.S. statutory rate of 35%. The relative mix of pre-tax earnings or losses and underlying income tax rates applicable to the various taxing jurisdictions can also affect our periodic consolidated effective income tax rate.

In December 2017, the Securities and Exchange Commission issued Staff Accounting Bulletin 118 (“SAB 118”) to provide clarification in implementing the Tax Cuts and Jobs Act of 2017 (“TCJA”) when registrants do not have the necessary information available to complete the accounting for an element of the TCJA in the period of its enactment. SAB 118 provides for tax amounts to be classified as provisional and subject to remeasurement for up to one year from the enactment date for such elements when the accounting effect is not complete, but can be reasonably estimated. We recorded income tax expense of approximately $1.4 billion in the fourth quarter of 2017, representing our provisional estimate of the U.S. Federal and state income taxes on the deemed repatriation of accumulated undistributed earnings of foreign subsidiaries. We continue to consider this estimate to be provisional and subject to remeasurement when we obtain the necessary additional information to complete the measurement. As of September 30, 2018, we had not finalized the inputs to the foreign earnings and profits calculations, the basis on which income taxes are determined. Our accounting for the repatriation tax under the TCJA will be completed during the fourth quarter of 2018. We do not anticipate significant adjustments to the provisional estimates.

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Investment gains/losses

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Investment gains/losses

Note 8. Investment gains/losses

A summary of investment gains and losses in the third quarter and first nine months of 2018 and 2017 follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Equity securities:
Unrealized investment gains/losses on securities held at the end of the period	$	14,294	$	—	$	12,126	$	—
Investment gains/losses during 2018 on securities sold in 2018		244		—		307		—
Gross realized gains		—		1,011		—		1,795
Gross realized losses		—		(419)		—		(626)
		14,538		592		12,433		1,169
Fixed maturity securities:
Gross realized gains		44		56		451		82
Gross realized losses		(10)		(2)		(152)		(16)
Other		(3)		11		18		27
	$	14,569	$	657	$	12,750	$	1,262

Prior to 2018, we recognized investment gains and losses in earnings when we sold or otherwise disposed of equity securities based on the difference between the proceeds from the sale and the cost of the securities and also when we recognized other-than-temporary impairment losses. Beginning in 2018, equity securities gains and losses include unrealized gains and losses from changes in fair values during the period on equity securities we still own. Prior to 2018, we recorded the changes in unrealized gains and losses on our investments in equity securities in other comprehensive income. See Note 2.

During the first nine months of 2018, as reflected on the Consolidated Statement of Cash Flows, we received proceeds of approximately $14.2 billion from sales of equity securities. In the table above, investment gains/losses on equity securities sold during 2018 reflect the difference between proceeds from sales and the fair value of the equity security sold at the beginning of the period or the purchase date, if later. Our taxable gains on equity securities sold during the third quarter and first nine months of 2018, which are generally the difference between the proceeds from sales and our original cost, were $1,329 million and $2,688 million, respectively.

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Receivables

9 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Receivables

Note 9. Receivables

Receivables of insurance and other businesses are comprised of the following (in millions).

	September 30, 2018		December 31, 2017
Insurance premiums receivable	$	13,002	$	11,058
Reinsurance recoverable on unpaid losses		2,944		3,201
Trade receivables		13,197		11,756
Other		3,121		2,925
Allowances for uncollectible accounts		(380)		(362)
	$	31,884	$	28,578

A summary of loans and finance receivables of our finance and financial products businesses follows (in millions).

	September 30, 2018		December 31, 2017
Loans and finance receivables before allowances and discounts	$	14,832	$	14,126
Allowances for uncollectible loans		(183)		(180)
Unamortized acquisition discounts		(172)		(198)
	$	14,477	$	13,748

Loans and finance receivables are predominantly installment loans originated or acquired by our manufactured housing business. Provisions for loan losses in the first nine months of 2018 and 2017 were $109 million and $124 million, respectively. Loan charge-offs, net of recoveries, in the first nine months were $106 million in 2018 and $126 million in 2017. At September 30, 2018, we evaluated approximately 98% of the loan balances collectively for impairment. As part of the evaluation process, credit quality indicators were reviewed and loans were designated as performing or non-performing. At September 30, 2018, we considered approximately 99% of the loan balances to be performing and approximately 95% of the loan balances to be current as to payment status.

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Inventories

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Inventories

Note 10. Inventories

Inventories are comprised of the following (in millions).

	September 30, 2018		December 31, 2017
Raw materials	$	3,326	$	2,997
Work in process and other		2,232		2,315
Finished manufactured goods		4,150		4,179
Goods acquired for resale		7,085		6,696
	$	16,793	$	16,187

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Property, plant and equipment and assets held for lease

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Abstract]

Property, plant and equipment and assets held for lease

Note 11. Property, plant and equipment and assets held for lease

A summary of property, plant and equipment of our insurance and other businesses follows (in millions).

	September 30, 2018		December 31, 2017
Land	$	2,272	$	2,292
Buildings and improvements		9,034		8,810
Machinery and equipment		28,594		21,935
Furniture, fixtures and other		4,972		4,387
		44,872		37,424
Accumulated depreciation		(20,515)		(17,320)
	$	24,357	$	20,104

In conjunction with the adoption of ASC 606, we recorded a net asset of approximately $3.5 billion related to aircraft sold under fractional aircraft ownership programs in machinery and equipment. Such amount included cost of approximately $5.3 billion, net of accumulated depreciation of $1.8 billion. We also recorded other liabilities of approximately $3.5 billion for estimated aircraft repurchase obligations and unearned lease revenues, substantially offsetting the amount recorded in machinery and equipment. See Note 2.

A summary of property, plant and equipment of our railroad and our utilities and energy businesses follows (in millions). The utility generation, transmission and distribution systems and interstate natural gas pipeline assets are owned by regulated public utility and natural gas pipeline subsidiaries.

	September 30, 2018		December 31, 2017
Railroad:
Land, track structure and other roadway	$	58,755	$	57,408
Locomotives, freight cars and other equipment		12,731		12,543
Construction in progress		910		989
		72,396		70,940
Accumulated depreciation		(9,596)		(8,627)
		62,800		62,313
Utilities and energy:
Utility generation, transmission and distribution systems		75,751		74,660
Interstate natural gas pipeline assets		7,295		7,176
Independent power plants and other assets		8,156		7,499
Construction in progress		3,724		2,556
		94,926		91,891
Accumulated depreciation		(27,339)		(26,020)
		67,587		65,871
	$	130,387	$	128,184

Assets held for lease and property, plant and equipment of our finance and financial products businesses are summarized below (in millions). Assets held for lease include railcars, intermodal tank containers, cranes, over-the-road trailers, storage units and furniture.

	September 30, 2018		December 31, 2017
Assets held for lease	$	12,736	$	12,318
Land		240		231
Buildings, machinery and other		1,527		1,444
		14,503		13,993
Accumulated depreciation		(4,230)		(4,062)
	$	10,273	$	9,931

A summary of depreciation expense for the first nine months of 2018 and 2017 follows (in millions).

	First Nine Months
	2018		2017
Insurance and other	$	1,954	$	1,636
Railroad, utilities and energy		3,678		3,604
Finance and financial products		485		487
	$	6,117	$	5,727

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Goodwill and other intangible assets

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and other intangible assets

Note 12. Goodwill and other intangible assets

A reconciliation of the change in the carrying value of goodwill is as follows (in millions).

	September 30, 2018		December 31, 2017
Balance at beginning of year	$	81,258	$	79,486
Acquisitions of businesses		250		1,545
Other, including foreign currency translation		(181)		227
Balance at end of period	$	81,327	$	81,258

Other intangible assets are summarized as follows (in millions).

	September 30, 2018				December 31, 2017
	Gross carrying amount		Accumulated   amortization		Gross carrying amount		Accumulated   amortization
Insurance and other	$	40,288	$	8,662	$	40,225	$	7,707
Railroad, utilities and energy		1,026		362		988		324
	$	41,314	$	9,024	$	41,213	$	8,031
Trademarks and trade names	$	5,396	$	744	$	5,381	$	692
Patents and technology		4,408		2,716		4,341		2,493
Customer relationships		28,343		4,351		28,322		3,722
Other		3,167		1,213		3,169		1,124
	$	41,314	$	9,024	$	41,213	$	8,031

Amortization expense in the first nine months was $1,052 million in 2018 and $1,108 million in 2017. Intangible assets with indefinite lives were approximately $18.9 billion as of September 30, 2018 and December 31, 2017.

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Derivative contracts

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative contracts

Note 13. Derivative contracts

We are party to derivative contracts primarily through our finance and financial products and our utilities and energy businesses. Currently, the derivative contracts of our finance and financial products businesses consist of equity index put option contracts written between 2004 and 2008. The liabilities and related notional values of such contracts follows (in millions).

	September 30, 2018				December 31, 2017
	Liabilities		Notional       Value		Liabilities		Notional       Value
Equity index put options	$	1,869	$	27,434(1)	$	2,172	$	28,753 (1)

⁽¹⁾  Represents the aggregate undiscounted amounts payable assuming that the value of each index is zero at each contract’s expiration date. Certain of these contracts are denominated in foreign currencies. Notional amounts are based on the foreign currency exchange rates as of each balance sheet date.

We record equity index put option contract liabilities at fair value and include the changes in the fair values of such contracts in earnings as derivative contract gains/losses. A summary of derivative contract gains/losses included in our Consolidated Statements of Earnings follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Equity index put options	$	137	$	308	$	303	$	703

The equity index put option contracts are European style options written prior to March 2008 on four major equity indexes. The remaining contracts expire between April 2019 and January 2026. At September 30, 2018, the remaining weighted average life of all contracts was approximately 2.25 years. In the second quarter of 2018, one equity index put option contract expired with no payment to the counterparty.

Future payments, if any, under any given contract will be required if the prevailing index value is below the contract strike price at the expiration date. We received aggregate premiums of approximately $4.1 billion on the remaining contracts at the contract inception dates and we have no counterparty credit risk. The aggregate intrinsic value (the undiscounted liability assuming the contracts are settled based on the index values and foreign currency exchange rates as of the balance sheet date) was $919 million at September 30, 2018 and $789 million at December 31, 2017. These contracts may not be unilaterally terminated or fully settled before the expiration dates and the ultimate amount of cash basis gains or losses on these contracts will not be determined until the contract expiration dates.

A limited number of our equity index put option contracts contain collateral posting requirements with respect to changes in the fair value or intrinsic value of the contracts and/or a downgrade of Berkshire’s credit ratings. As of September 30, 2018, we did not have any collateral posting requirements. If Berkshire’s credit ratings (currently AA from Standard & Poor’s and Aa2 from Moody’s) are downgraded below either A- by Standard & Poor’s or A3 by Moody’s, collateral of up to $1.1 billion could be required to be posted.

Our regulated utility subsidiaries are exposed to variations in the prices of fuel required to generate electricity, wholesale electricity purchased and sold and natural gas supplied for customers. We may use forward purchases and sales, futures, swaps and options to manage a portion of these price risks. Most of the net derivative contract assets or liabilities of our regulated utilities are probable of recovery through rates and are offset by regulatory liabilities or assets. Derivative contract assets are included in other assets and were $154 million as of September 30, 2018 and $142 million as of December 31, 2017. Derivative contract liabilities are included in other liabilities and were $80 million as of September 30, 2018 and $82 million as of December 31, 2017.

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Supplemental cash flow information

9 Months Ended

Sep. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Supplemental cash flow information

Note 14. Supplemental cash flow information

Supplemental cash flow information follows (in millions).

	First Nine Months
	2018		2017
Cash paid during the period for:
Income taxes	$	3,977	$	1,774
Interest:
Insurance and other businesses		677		747
Railroad, utilities and energy businesses		2,129		2,111
Finance and financial products businesses		257		296
Non-cash investing and financing activities:
Liabilities assumed in connection with business acquisitions		93		685
Equity securities surrendered in connection with warrant exercise		—		4,965

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Unpaid losses and loss adjustment expenses

9 Months Ended

Sep. 30, 2018

Insurance [Abstract]

Unpaid losses and loss adjustment expenses

Note 15. Unpaid losses and loss adjustment expenses

Our liabilities for unpaid losses and loss adjustment expenses (also referred to as “claim liabilities”) under short-duration property and casualty insurance and reinsurance contracts are based upon estimates of the ultimate claim costs associated with claim occurrences as of the balance sheet date and include estimates for incurred-but-not-reported (“IBNR”) claims. Reconciliations of the changes in claim liabilities, excluding liabilities under retroactive reinsurance contracts (see Note 16), for the nine months ending September 30, 2018 and 2017 follow (in millions).

	2018		2017
Balances – beginning of year:
Gross liabilities	$	61,122	$	53,379
Reinsurance recoverable on unpaid losses		(3,201)		(3,338)
Net liabilities		57,921		50,041
Incurred losses and loss adjustment expenses:
Current accident year events		29,071		28,632
Prior accident years’ events		(1,566)		(461)
Total incurred losses and loss adjustment expenses		27,505		28,171
Paid losses and loss adjustment expenses:
Current accident year events		(12,474)		(11,539)
Prior accident years’ events		(11,516)		(9,952)
Total payments		(23,990)		(21,491)
Foreign currency translation adjustment		(117)		603
Balances – September 30:
Net liabilities		61,319		57,324
Reinsurance recoverable on unpaid losses		2,944		3,254
Gross liabilities	$	64,263	$	60,578

Incurred losses and loss adjustment expenses in the first nine months of 2018 and 2017 included net reductions of estimated ultimate claim liabilities for prior accident years of $1,566 million and $461 million, respectively. We reduced estimated ultimate claim liabilities for prior accident years related to primary insurance by $985 million in the first nine months of 2018 and $569 million in the first nine months of 2017, which included reductions of $478 million in 2018 and increases of $37 million in 2017 related to private passenger automobile insurance coverages. We also reduced estimated ultimate claim liabilities with respect to prior accident years for property and casualty reinsurance by $581 million in the first nine months of 2018, compared to an increase of $108 million in the first nine months of 2017.

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Retroactive reinsurance contracts

9 Months Ended

Sep. 30, 2018

Text Block [Abstract]

Retroactive reinsurance contracts

Note 16. Retroactive reinsurance contracts

Retroactive reinsurance policies provide indemnification of losses and loss adjustment expenses of short-duration insurance contracts with respect to underlying loss events that occurred prior to the contract inception date. Claims payments may commence immediately after the contract date or, if applicable, once a contractual retention amount has been reached. Reconciliations of the changes in estimated liabilities for retroactive reinsurance unpaid losses and loss adjustment expenses (“claim liabilities”) and related deferred charge reinsurance assumed assets for the nine months ending September 30, 2018 and 2017 follows (in millions).

	2018				2017
	Unpaid losses and loss adjustment expenses		Deferred charges reinsurance assumed		Unpaid losses and loss adjustment expenses		Deferred charges reinsurance assumed
Balances – beginning of year:	$	42,937	$	(15,278)	$	24,972	$	(8,047)
Incurred losses and loss adjustment expenses
Current year contracts		—		—		17,213		(6,170)
Prior years’ contracts		(36)		827		(409)		645
Total		(36)		827		16,804		(5,525)
Paid losses and loss adjustment expenses		(966)		—		(783)		—
Balances – September 30:	$	41,935	$	(14,451)	$	40,993	$	(13,572)
Incurred losses and loss adjustment expenses, net of deferred charges	$	791			$	11,279

In the preceding table, classifications of incurred losses and loss adjustment expenses are based on the inception dates of the contracts. We do not believe that analysis of losses incurred and paid by accident year of the underlying event is relevant or meaningful given that our exposure to losses incepts when the contract incepts. Further, we believe the classifications of reported claims and case development liabilities has little or no practical analytical value.

In the first quarter of 2017, National Indemnity Company (“NICO”), a wholly-owned subsidiary, entered into an agreement with various subsidiaries of American International Group, Inc. (collectively, “AIG”), which became effective on February 2, 2017. Under this agreement, NICO agreed to indemnify AIG for 80% of up to $25 billion of losses and allocated loss adjustment expenses in excess of $25 billion retained by AIG with respect to certain commercial insurance loss events occurring prior to 2016. As of the effective date, we recorded premiums earned of $10.2 billion and losses incurred of $10.2 billion, which consisted of liabilities for unpaid losses and loss adjustment expenses of $16.4 billion and deferred charge reinsurance assumed assets of $6.2 billion. Berkshire agreed to guarantee the timely payment of all amounts due to AIG under the agreement. Our estimated ultimate claim liabilities with respect to the AIG contract at September 30, 2018 and at December 31, 2017 were $18.2 billion, which reflected an increase of $1.8 billion in estimated ultimate claim liabilities recorded in the fourth quarter of 2017. Deferred charge assets related to the AIG contract were approximately $7.1 billion at September 30, 2018 and $7.5 billion at December 31, 2017, which included an additional $1.7 billion arising from the aforementioned increase to ultimate claim liabilities in the fourth quarter.

Incurred losses and loss adjustment expenses related to contracts written in prior years were $791 million in the first nine months of 2018 and $236 million in the first nine months of 2017. Such losses included recurring amortization of deferred charge assets and net gains from reductions of estimated ultimate claim liabilities.

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Notes payable and other borrowings

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Notes payable and other borrowings

Note 17. Notes payable and other borrowings

Notes payable and other borrowings are summarized below (dollars in millions). The weighted average interest rates and maturity date ranges shown in the following tables are based on borrowings as of September 30, 2018.

	Weighted Average Interest Rate			September 30, 2018		December 31, 2017
Insurance and other:
Issued by Berkshire:
U.S. Dollar denominated borrowings due 2018-2047		3.1	%	$	9,058	$	10,603
Euro denominated borrowings due 2020-2035		1.1	%		7,897		8,164
Short-term subsidiary borrowings		4.1	%		1,733		1,832
Other subsidiary borrowings due 2018-2045		4.0	%		5,583		6,725
				$	24,271	$	27,324

The carrying value of Berkshire’s Euro denominated senior notes reflects the Euro/U.S. Dollar exchange rate as of the balance sheet date. The gains or losses arising from the changes in the Euro/U.S. Dollar exchange rate during the period are recorded in earnings as a component of interest expense. The change in the Euro/U.S. Dollar exchange rate in the first nine months of 2018 resulted in reductions of $273 million in interest expense and to the carrying value of the Euro denominated senior notes compared to increases of $860 million in interest expense and to the carrying value of the notes in the first nine months of 2017.

	Weighted Average  Interest Rate		September 30,  2018		December 31,  2017
Railroad, utilities and energy:
Issued by Berkshire Hathaway Energy Company (“BHE”) and its subsidiaries:
BHE senior unsecured debt due 2018-2049		4.5%	$	8,970	$	6,452
Subsidiary and other debt due 2019-2064		4.7%		28,588		28,739
Short-term debt		3.0%		1,784		4,488
Issued by BNSF due 2018-2097		4.7%		23,257		22,499
			$	62,599	$	62,178

BHE subsidiary debt represents amounts issued pursuant to separate financing agreements. Substantially all of the assets of certain BHE subsidiaries are, or may be, pledged or encumbered to support or otherwise secure debt. These borrowing arrangements generally contain various covenants, which pertain to leverage ratios, interest coverage ratios and/or debt service coverage ratios, among other covenants. During the first nine months of 2018, BHE and its subsidiaries issued approximately $5.5 billion of long-term debt, including $2.05 billion in the third quarter. The debt issued in 2018 has maturity dates ranging from 2020 to 2049 and a weighted average interest rate of 3.6%. Proceeds from these debt issuances were used to repay debt, to fund capital expenditures and for general corporate purposes.

BNSF’s borrowings are primarily senior unsecured debentures. In the first nine months of 2018, BNSF issued $1.5 billion of senior unsecured debentures due in 2048, including $750 million in the third quarter. These debentures have a weighted average interest rate of 4.1%. In 2018, BNSF repaid $650 million of maturing debentures. As of September 30, 2018, BNSF, BHE and their subsidiaries were in compliance with all applicable debt covenants. Berkshire does not guarantee any debt, borrowings or lines of credit of BNSF, BHE or their subsidiaries.

	Weighted Average  Interest Rate		September 30,  2018		December 31,  2017
Finance and financial products:
Issued by Berkshire Hathaway Finance Corporation (“BHFC”) due 2019-2048		3.3%	$	10,649	$	12,926
Issued by other subsidiaries due 2018-2028		3.6%		121		159
			$	10,770	$	13,085

Borrowings of BHFC, a wholly owned finance subsidiary of Berkshire, consist of senior unsecured notes used to fund manufactured housing loans originated or acquired and assets held for lease of certain finance subsidiaries. In August 2018, BHFC issued $2.35 billion of 4.2% senior notes due in 2048. Such borrowings are fully and unconditionally guaranteed by Berkshire. During the first nine months of 2018, BHFC repaid $4.6 billion of maturing senior notes.

As of September 30, 2018, our subsidiaries had unused lines of credit and commercial paper capacity aggregating approximately $8.4 billion to support short-term borrowing programs and provide additional liquidity. Such unused lines of credit included approximately $6.8 billion related to BHE and its subsidiaries. In addition to BHFC’s borrowings, Berkshire guaranteed approximately $1.7 billion of other subsidiary borrowings at September 30, 2018. Generally, Berkshire’s guarantee of a subsidiary’s debt obligation is an absolute, unconditional and irrevocable guarantee for the full and prompt payment when due of all payment obligations.

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Fair value measurements

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair value measurements

Note 18. Fair value measurements

Our financial assets and liabilities are summarized below as of September 30, 2018 and December 31, 2017 with fair values shown according to the fair value hierarchy (in millions). The carrying values of cash and cash equivalents, U.S. Treasury Bills, receivables and accounts payable, accruals and other liabilities are considered to be reasonable estimates of their fair values.

	Carrying     Value		Fair Value		Quoted Prices     (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2018
Investments in fixed maturity securities:
U.S. Treasury, U.S. government corporations and agencies	$	3,599	$	3,599	$	2,378	$	1,221	$	—
U.S. states, municipalities and political subdivisions		290		290		—		290		—
Foreign governments		7,370		7,370		5,162		2,208		—
Corporate bonds		6,458		6,458		—		6,453		5
Mortgage-backed securities		554		554		—		554		—
Investments in equity securities		207,332		207,332		206,985		47		300
Investment in Kraft Heinz common stock		17,453		17,935		17,935		—		—
Loans and finance receivables		14,477		14,735		—		59		14,676
Derivative contract assets (1)		154		154		3		41		110
Derivative contract liabilities:
Railroad, utilities and energy (1)		80		80		1		63		16
Equity index put options		1,869		1,869		—		—		1,869
Notes payable and other borrowings:
Insurance and other		24,271		24,422		—		24,422		—
Railroad, utilities and energy		62,599		66,823		—		66,823		—
Finance and financial products		10,770		10,979		—		10,953		26
December 31, 2017
Investments in fixed maturity securities:
U.S. Treasury, U.S. government corporations and agencies	$	3,953	$	3,953	$	2,360	$	1,593	$	—
U.S. states, municipalities and political subdivisions		854		854		—		854		—
Foreign governments		8,822		8,822		6,946		1,876		—
Corporate bonds		6,862		6,862		—		6,856		6
Mortgage-backed securities		862		862		—		862		—
Investments in equity securities		170,540		170,540		170,494		46		—
Investment in Kraft Heinz common stock		17,635		25,306		25,306		—		—
Loans and finance receivables		13,748		14,136		—		17		14,119
Derivative contract assets (1)		142		142		1		28		113
Derivative contract liabilities:
Railroad, utilities and energy (1)		82		82		3		69		10
Equity index put options		2,172		2,172		—		—		2,172
Notes payable and other borrowings:
Insurance and other		27,324		28,180		—		28,180		—
Railroad, utilities and energy		62,178		70,538		—		70,538		—
Finance and financial products		13,085		13,582		—		13,577		5

(1) Assets are included in other assets and liabilities are included in accounts payable, accruals and other liabilities.

The fair values of substantially all of our financial instruments were measured using market or income approaches. The hierarchy for measuring fair value consists of Levels 1 through 3, which are described below.

Level 1 – Inputs represent unadjusted quoted prices for identical assets or liabilities exchanged in active markets.

Level 2 – Inputs include directly or indirectly observable inputs (other than Level 1 inputs), such as quoted prices for similar assets or liabilities exchanged in active or inactive markets or quoted prices for identical assets or liabilities exchanged in inactive markets. In addition, other inputs considered in fair value determinations may include interest rates and yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates, and inputs derived principally from or corroborated by observable market data by correlation or other means. Pricing evaluations generally reflect discounted expected future cash flows, which incorporate yield curves for instruments with similar characteristics, such as credit ratings, estimated durations and yields for other instruments of the issuer or entities in the same industry sector.

Level 3 – Inputs include unobservable inputs used in the measurement of assets and liabilities. Management is required to use its own assumptions regarding unobservable inputs because there is little, if any, market activity in the assets or liabilities and it may be unable to corroborate the related observable inputs. Unobservable inputs require management to make certain projections and assumptions about the information that would be used by market participants in valuing assets or liabilities.

Reconciliations of assets and liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) for the nine months ending September 30, 2018 and 2017 follow (in millions).

	Investments   in equity and fixed maturity securities		Net     derivative     contract liabilities
Nine months ending September 30, 2018
Balance at December 31, 2017	$	6	$	(2,069)
Gains (losses) included in:
Earnings		—		446
Regulatory assets and liabilities		—		(11)
Acquisitions, dispositions and settlements		(1)		(141)
Balance at September 30, 2018	$	5	$	(1,775)
Nine months ending September 30, 2017
Balance at December 31, 2016	$	17,321	$	(2,824)
Gains (losses) included in:
Earnings		—		822
Other comprehensive income		1,157		(3)
Regulatory assets and liabilities		—		(5)
Acquisitions, dispositions and settlements		(58)		(78)
Transfers into/out of Level 3		(18,413)		—
Balance at September 30, 2017	$	7	$	(2,088)

Gains and losses included in earnings are reported as components of investment gains/losses, derivative gains/losses and other revenues, as appropriate. In 2017, gains and losses included in other comprehensive income were primarily the net change in unrealized appreciation of investments and the reclassification of investment appreciation in net earnings in our Consolidated Statements of Comprehensive Income.

On June 30, 2017, we announced our intention to exercise our investment in Bank of America Corporation Warrants (“BAC Warrants”) for common stock in the third quarter of 2017 and that we expected to use our investment in Bank of America Corporation Preferred Stock as consideration. In the second quarter of 2017, Restaurant Brands International, Inc. (“RBI”) announced its intention to redeem our investment in RBI Preferred Shares in the fourth quarter of 2017. As of June 30, 2017, we based our valuations of these investments on such expectations and we significantly reduced expected durations and effectively eliminated the discounts for transferability and other restrictions. As a result, we concluded the Level 3 inputs used in the previous fair value determinations of our investments in BAC Warrants and RBI Preferred Shares were not significant and that the valuations of such investments were deemed Level 2 measurements.

Quantitative information as of September 30, 2018, with respect to assets and liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) follows (in millions).

	Fair Value		Principal Valuation Techniques	Unobservable Inputs		Weighted   Average
Derivative contract liabilities – Equity index put options	$	1,869	Option pricing model		Volatility		16%

Our equity index put option contracts are illiquid and contain contract terms that are not standard in derivatives markets. For example, we are not required to post collateral under most of our contracts and certain of the contracts have relatively long durations. For these and other reasons, we classified these contracts as Level 3 measurements. The methods we use to measure fair values are those that we believe market participants would use in determining exchange prices with respect to our contracts.

We value equity index put option contracts based on the Black-Scholes option valuation model. Inputs to this model include index price, contract duration and dividend and interest rate inputs (including a Berkshire non-performance input) which are observable. However, we believe that the valuation of our longer duration contracts using any model is inherently subjective and, given the lack of observable transactions and prices, acceptable values may be subject to wide ranges. Volatility inputs represent our expectations, which consider the remaining duration of each contract and assume that the contracts will remain outstanding until the expiration dates. Increases or decreases in the volatility inputs will produce increases or decreases in the fair values of the liabilities.

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Common stock

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Common stock

Note 19. Common stock

Changes in Berkshire’s issued, treasury and outstanding common stock during the nine months ending September 30, 2018 are shown in the table below. In addition to our common stock, 1,000,000 shares of preferred stock are authorized, but none are issued.

	Class A, $5 Par Value         (1,650,000 shares authorized)						Class B, $0.0033 Par Value (3,225,000,000 shares authorized)
	Issued		Treasury		Outstanding		Issued		Treasury		Outstanding
Balance at December 31, 2017		762,755		(11,680)		751,075		1,342,066,749		(1,409,762)		1,340,656,987
Conversions of Class A common stock to Class B common stock and exercises of replacement stock options issued in a business acquisition		(16,850)		—		(16,850)		25,886,063		—		25,886,063
Treasury stock acquired		—		(225)		(225)		—		(4,139,192)		(4,139,192)
Balance at September 30, 2018		745,905		(11,905)		734,000		1,367,952,812		(5,548,954)		1,362,403,858

Each Class A common share is entitled to one vote per share. Class B common stock possesses dividend and distribution rights equal to one-fifteen-hundredth (1/1,500) of such rights of Class A common stock. Each Class B common share possesses voting rights equivalent to one-ten-thousandth (1/10,000) of the voting rights of a Class A share. Unless otherwise required under Delaware General Corporation Law, Class A and Class B common shares vote as a single class. Each share of Class A common stock is convertible, at the option of the holder, into 1,500 shares of Class B common stock. Class B common stock is not convertible into Class A common stock. On an equivalent Class A common stock basis, there were 1,642,269 shares outstanding as of September 30, 2018 and 1,644,846 shares outstanding as of December 31, 2017.

Since we have two classes of common stock, we provide earnings per share data on the Consolidated Statements of Earnings for average equivalent Class A shares outstanding and average equivalent Class B shares outstanding. Class B shares are economically equivalent to one-fifteen-hundredth (1/1,500) of a Class A share. Average equivalent Class A shares outstanding represents average Class A shares outstanding plus one-fifteen-hundredth (1/1,500) of the average Class B shares outstanding. Average equivalent Class B shares outstanding represents average Class B shares outstanding plus 1,500 times average Class A shares outstanding.

For several years, Berkshire had a common stock repurchase program, which permitted Berkshire to repurchase its Class A and Class B shares at prices no higher than a 20% premium over the book value of the shares. On July 17, 2018, Berkshire’s Board of Directors authorized an amendment to the program, permitting Berkshire to repurchase shares any time that Warren Buffett, Berkshire’s Chairman of the Board and Chief Executive Officer, and Charlie Munger, a Vice-Chairman of the Board, believe that the repurchase price is below Berkshire’s intrinsic value, conservatively determined. The program continues to allow share repurchases in the open market or through privately negotiated transactions and does not specify a maximum number of shares to be repurchased. However, repurchases will not be made if they would reduce the total value of Berkshire’s consolidated cash, cash equivalents and U.S. Treasury Bills holdings below $20 billion. The repurchase program does not obligate Berkshire to repurchase any specific dollar amount or number of Class A or Class B shares and there is no expiration date to the program.

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Accumulated other comprehensive income

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Accumulated other comprehensive income

Note 20. Accumulated other comprehensive income

A summary of the net changes in after-tax accumulated other comprehensive income attributable to Berkshire Hathaway shareholders and amounts reclassified out of accumulated other comprehensive income for the nine months ending September 30, 2018 and 2017 follows (in millions).

	Unrealized appreciation of  investments, net		Foreign currency       translation		Prior service and actuarial gains/losses of defined benefit   pension plans		Other		Accumulated other  comprehensive  income
2018
Balance at December 31, 2017	$	62,093	$	(3,114)	$	(420)	$	12	$	58,571
Reclassifications to retained earnings upon adoption of new accounting standards		(61,340)		(65)		36		(6)		(61,375)
Other comprehensive income, net before reclassifications		(142)		(776)		(33)		(19)		(970)
Reclassifications into net earnings		(236)		—		76		7		(153)
Balance at September 30, 2018	$	375	$	(3,955)	$	(341)	$	(6)	$	(3,927)
Reclassifications into net earnings:
Reclassifications before income taxes	$	(299)	$	—	$	101	$	10	$	(188)
Applicable income taxes		(63)		—		25		3		(35)
	$	(236)	$	—	$	76	$	7	$	(153)
2017
Balance at December 31, 2016	$	43,176	$	(5,268)	$	(593)	$	(17)	$	37,298
Other comprehensive income, net before reclassifications		11,734		1,946		(90)		19		13,609
Reclassifications into net earnings		(803)		—		61		18		(724)
Balance at September 30, 2017	$	54,107	$	(3,322)	$	(622)	$	20	$	50,183
Reclassifications into net earnings:
Reclassifications before income taxes	$	(1,235)	$	—	$	82	$	32	$	(1,121)
Applicable income taxes		(432)		—		21		14		(397)
	$	(803)	$	—	$	61	$	18	$	(724)

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Contingencies and Subsequent Event

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Contingencies and Subsequent Event

Note 21. Contingencies and Subsequent Event

We are parties in a variety of legal actions that routinely arise out of the normal course of business, including legal actions seeking to establish liability directly through insurance contracts or indirectly through reinsurance contracts issued by Berkshire subsidiaries. Plaintiffs occasionally seek punitive or exemplary damages. We do not believe that such normal and routine litigation will have a material effect on our financial condition or results of operations. Berkshire and certain of its subsidiaries are also involved in other kinds of legal actions, some of which assert or may assert claims or seek to impose fines and penalties. We believe that any liability that may arise as a result of other pending legal actions will not have a material effect on our consolidated financial condition or results of operations.

In 2016, NICO entered into a definitive agreement to acquire Medical Liability Mutual Insurance Company, (“Medical Liability Mutual”), a writer of medical professional liability insurance domiciled in New York. The acquisition price was approximately $2.5 billion. The acquisition involved the conversion of Medical Liability Mutual from a mutual company to a stock company. The closing of the transaction was subject to various regulatory approvals, customary closing conditions and the approval of the Medical Liability Mutual policyholders eligible to vote on the proposed demutualization and sale. The acquisition closed on October 1, 2018, at which time, Medical Liability Mutual’s name was changed to the MLMIC Insurance Company (“MLMIC”). The results of MLMIC will be included in Berkshire’s consolidated results beginning as of that date. As of the acquisition date, the preliminary fair values of MLMIC’s assets were approximately $6.3 billion, consisting primarily of cash and investments, and liabilities were approximately $3.8 billion, consisting primarily of unpaid losses and loss adjustment expenses and unearned insurance premiums. We believe goodwill arising from this acquisition will be insignificant. MLMIC’s premiums earned for the first nine months of 2018 were approximately $300 million.

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Business segment data

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Business segment data

Note 22. Business segment data

Our operating businesses include a large and diverse group of insurance, railroad, utilities and energy, finance, manufacturing, service and retailing businesses. Our reportable business segments are organized in a manner that reflects how management views those business activities. Certain businesses have been grouped together for segment reporting based upon similar products or product lines, marketing, selling and distribution characteristics, even though those business units are operated under separate local management. Revenues by segment for the third quarter and first nine months of 2018 and 2017 were as follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Operating Businesses:
Insurance:
Underwriting:
GEICO	$	8,506	$	7,543	$	24,705	$	21,632
Berkshire Hathaway Reinsurance Group		3,777		3,954		11,229		20,550
Berkshire Hathaway Primary Group		2,050		1,852		5,921		5,287
Investment income		1,446		1,248		4,058		3,664
Total insurance		15,779		14,597		45,913		51,133
BNSF		6,147		5,314		17,649		15,749
Berkshire Hathaway Energy		5,706		5,351		15,268		14,184
Manufacturing		13,552		12,819		40,339		37,654
McLane Company		12,822		12,798		37,438		37,480
Service and retailing		6,974		6,527		20,623		19,170
Finance and financial products		2,432		2,153		6,861		6,019
		63,412		59,559		184,091		181,389
Reconciliation of segments to consolidated amount:
Corporate, eliminations and other		38		(52)		32		(256)
	$	63,450	$	59,507	$	184,123	$	181,133

Earnings before income taxes by segment for the third quarter and first nine months of 2018 and 2017 were as follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Operating Businesses:
Insurance:
Underwriting:
GEICO	$	627	$	(416)	$	1,977	$	(122)
Berkshire Hathaway Reinsurance Group		(163)		(1,845)		(124)		(2,963)
Berkshire Hathaway Primary Group		135		52		468		473
Investment income		1,455		1,246		4,052		3,658
Total insurance		2,054		(963)		6,373		1,046
BNSF		1,879		1,710		5,047		4,592
Berkshire Hathaway Energy		1,165		1,243		2,238		2,481
Manufacturing		2,012		2,002		6,002		5,428
McLane Company		44		45		171		202
Service and retailing		628		491		1,840		1,439
Finance and financial products		530		496		1,589		1,438
		8,312		5,024		23,260		16,626
Reconciliation of segments to consolidated amount:
Investment and derivative contract gains/losses		14,706		965		13,053		1,965
Interest expense, not allocated to segments		(60)		(386)		(77)		(1,243)
Equity method investments		316		305		1,044		932
Corporate, eliminations and other		(127)		(278)		(558)		(833)
	$	23,147	$	5,630	$	36,722	$	17,447

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New Accounting Pronouncements (Policies)

9 Months Ended

Sep. 30, 2018

Accounting Changes and Error Corrections [Abstract]

New Accounting Pronouncements

On January 1, 2018, we adopted Accounting Standards Update (“ASU”) 2016-01 “Financial Instruments—Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”), ASU 2018-02 “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” (“ASU 2018-02”) and Accounting Standards Codification (“ASC”) 606 – “Revenues from Contracts with Customers” (“ASC 606”). A summary of the effects of the initial adoption of ASU 2016-01, ASU 2018-02 and ASC 606 follows (in millions).

	ASU 2016-01		ASU 2018-02		ASC 606		Total
Increase (decrease):
Assets	$	—	$	—	$	3,382	$	3,382
Liabilities		—		—		3,453		3,453
Accumulated other comprehensive income		(61,459)		84		—		(61,375)
Retained earnings		61,459		(84)		(71)		61,304
Shareholders’ equity		—		—		(71)		(71)

With respect to ASU 2016-01, beginning in 2018, we are including unrealized gains and losses arising from the changes in the fair values of our equity securities during the period as a component of investment gains in the Consolidated Statements of Earnings. For periods ending prior to January 1, 2018, we recognized gains and losses in earnings when we sold equity securities, based on the difference between the sale proceeds and the cost of the securities, and for other-than-temporary impairment losses. We recorded unrealized gains and losses from the changes in fair value of available-for-sale equity securities in other comprehensive income. We continue to carry our investments in equity securities at fair value and there is no change to the asset values or total shareholders’ equity amounts we would have otherwise recorded. ASU 2016-01prohibited the restatement of prior year financial statements. However, as of January 1, 2018, we reclassified net after-tax unrealized gains on equity securities from accumulated other comprehensive income to retained earnings.

In connection with our adoption of ASU 2018-02, we reclassified the stranded deferred income tax effects that were included in accumulated other comprehensive income as of January 1, 2018 to retained earnings. These stranded income tax effects arose from the reduction in the U.S. statutory income tax rate under the U.S. Tax Cuts and Jobs Act enacted on December 22, 2017. The effect of the reduction in the statutory income tax rate on accumulated other comprehensive income items was recorded in earnings in December 2017. Prior year financial statements were not restated.

We adopted ASC 606 using the modified retrospective method, whereby the cumulative effect of the adoption was recorded as an adjustment to retained earnings. Prior year financial statements were not restated. The initial adoption of ASC 606 as of January 1, 2018 resulted in increases to assets and other liabilities, with a relatively minor reduction in retained earnings. Prior to January 1, 2018, we recognized revenues from the sales of fractional ownership interests in aircraft over the term of the related management services agreements, as the transfers of the ownership interests were inseparable from the management services agreements. These agreements also include provisions that require us to repurchase the fractional interest at fair market value at contract termination or upon the customer’s request following the end of a minimum commitment period. ASC 606 provides that such contracts are subject to accounting guidance for lease contracts and not ASC 606. The principal effects of this re-characterization were to increase both property, plant and equipment and other liabilities by approximately $3.5 billion. The re-characterization of these fractional ownership interests as operating leases did not have a material effect on our consolidated revenues or earnings for the first nine months of 2018.

In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-02 “Leases,” which together with subsequent amendments is included in ASC 842. Most significantly, ASC 842 requires a lessee to recognize a liability to make lease payments and an asset with respect to its right to use the underlying asset for the lease term. ASC 842 also addresses accounting and reporting by lessors, which is not significantly different from current accounting and reporting, and further provides for qualitative and quantitative disclosures. We intend to adopt ASC 842 as of January 1, 2019 under the modified retrospective method.

We are party to contracts where we are the lessee and other contracts where we are the lessor. For contracts where we are the lessee, we will record lease liabilities and right of use assets for contracts in effect on January 1, 2019 based on the facts and circumstances as of that date. While we continue to evaluate certain provisions of ASC 842, based on our current estimates, we expect to recognize right of use assets and lessee lease liabilities of approximately $6 billion with respect to operating leases. We do not believe the adoption of ASC 842 will have a material effect on our consolidated financial position, results of operations or cash flows.

In June 2016, the FASB issued ASU 2016-13 “Financial Instruments—Credit Losses,” which provides for the recognition and measurement at the reporting date of all expected credit losses for financial assets held at amortized cost and available-for-sale debt securities. Currently, credit losses are recognized and measured when such losses become probable based on the prevailing facts and circumstances. ASU 2016-13 is effective for reporting periods beginning after December 15, 2019. We are currently evaluating the effect this standard will have on our Consolidated Financial Statements.

In January 2017, the FASB issued ASU 2017-04 “Simplifying the Test for Goodwill Impairment.” ASU 2017-04 eliminates the requirement to determine the implied value of goodwill in measuring an impairment loss. Upon adoption of ASU 2017-04, the measurement of a goodwill impairment will represent the excess of the reporting unit’s carrying value over fair value, limited to the carrying value of goodwill. ASU 2017-04 is effective for goodwill impairment tests in fiscal years beginning after December 15, 2019, with early adoption permitted.

In August 2018, the FASB issued ASU 2018-12 “Targeted Improvements to the Accounting for Long-Duration Contracts.” ASU 2018-12 requires periodic reassessment of actuarial and discount rate assumptions used in the valuation of policyholder liabilities and deferred acquisition costs arising from the issuance of long-duration insurance and reinsurance contracts, with the effects of changes in cash flow assumptions reflected in earnings and the effects of changes in discount rate assumptions reflected in other comprehensive income. Under current accounting guidance, the actuarial and discount rate assumptions are set at the contract inception date and not subsequently changed, except under limited circumstances. ASU 2018-12 also requires new disclosures and is effective for fiscal years beginning after December 15, 2020, with early adoption permitted. We are evaluating the effect this standard will have on our Consolidated Financial Statements.

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New Accounting Pronouncements (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Changes and Error Corrections [Abstract]

Summary of effects of initial adoption of ASU 2016-01, ASU 2018-02 and ASC 606

A summary of the effects of the initial adoption of ASU 2016-01, ASU 2018-02 and ASC 606 follows (in millions).

	ASU 2016-01		ASU 2018-02		ASC 606		Total
Increase (decrease):
Assets	$	—	$	—	$	3,382	$	3,382
Liabilities		—		—		3,453		3,453
Accumulated other comprehensive income		(61,459)		84		—		(61,375)
Retained earnings		61,459		(84)		(71)		61,304
Shareholders’ equity		—		—		(71)		(71)

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Revenues from contracts with customers (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue from contracts with customers disaggregated by reportable segment and source of revenue

The following table summarizes customer contract revenues disaggregated by reportable segment and the source of the revenue for the three and nine months ending September 30, 2018 (in millions). Other revenues included in our consolidated revenues were primarily insurance premiums earned, interest, dividend and other investment income and lease income which are not within the scope of ASC 606.

	Manufacturing		McLane     Company		Service and Retail		BNSF		Berkshire Hathaway Energy		Finance and Financial Products		Insurance, Corporate and other		Total
Three months ending September 30, 2018
Manufactured products:
Industrial and commercial products	$	6,384	$	—	$	47	$	—	$	—	$	82	$	—	$	6,513
Building products		3,473		—		—		—		—		4		—		3,477
Consumer products		2,838		—		—		—		—		1,170		—		4,008
Grocery and convenience store distribution		—		8,709		—		—		—		—		—		8,709
Food and beverage distribution		—		4,079		—		—		—		—		—		4,079
Auto sales		—		—		2,083		—		—		—		—		2,083
Other retail and wholesale distribution		521		—		3,117		—		—		23		—		3,661
Service		262		16		965		6,099		1,140		148		—		8,630
Electricity and natural gas		—		—		—		—		4,267		—		—		4,267
Total		13,478		12,804		6,212		6,099		5,407		1,427		—		45,427
Other revenue		51		18		743		13		299		1,004		15,895		18,023
	$	13,529	$	12,822	$	6,955	$	6,112	$	5,706	$	2,431	$	15,895	$	63,450
	Manufacturing		McLane Company		Service and Retail		BNSF		Berkshire Hathaway Energy		Finance and Financial Products		Insurance, Corporate and other		Total
Nine months ending September 30, 2018
Manufactured products:
Industrial and commercial products	$	19,306	$	—	$	155	$	—	$	—	$	503	$	—	$	19,964
Building products		9,817		—		—		—		—		11		—		9,828
Consumer products		8,734		—		—		—		—		3,124		—		11,858
Grocery and convenience store distribution		—		25,128		—		—		—		—		—		25,128
Food and beverage distribution		—		12,203		—		—		—		—		—		12,203
Auto sales		—		—		6,087		—		—		—		—		6,087
Other retail and wholesale distribution		1,533		—		8,734		—		—		65		—		10,332
Service		759		53		2,912		17,510		3,026		174		—		24,434
Electricity and natural gas		—		—		—		—		11,357		—		—		11,357
Total		40,149		37,384		17,888		17,510		14,383		3,877		—		131,191
Other revenue		132		54		2,664		37		885		2,980		46,180		52,932
	$	40,281	$	37,438	$	20,552	$	17,547	$	15,268	$	6,857	$	46,180	$	184,123

Transaction price allocated to significant unsatisfied remaining performance obligations

A summary of the transaction price allocated to the significant unsatisfied remaining performance obligations relating to contracts with expected durations in excess of one year as of September 30, 2018 follows (in millions).

	Performance obligations     expected to be satisfied:
	Less than 12 months		Greater than 12 months		Total
Manufactured products:
Industrial and commercial products	$	50	$	2,549	$	2,599
Electricity and natural gas		1,011		5,879		6,890

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Investments in fixed maturity securities (Tables)

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of investments in securities with fixed maturities

Our investments in fixed maturity securities as of September 30, 2018 and December 31, 2017 are summarized by type below (in millions).

	Amortized   Cost		Unrealized Gains		Unrealized Losses		Fair     Value
September 30, 2018
U.S. Treasury, U.S. government corporations and agencies	$	3,626	$	8	$	(35)	$	3,599
U.S. states, municipalities and political subdivisions		276		15		(1)		290
Foreign governments		7,362		45		(37)		7,370
Corporate bonds		6,029		436		(7)		6,458
Mortgage-backed securities		502		56		(4)		554
	$	17,795	$	560	$	(84)	$	18,271
December 31, 2017
U.S. Treasury, U.S. government corporations and agencies	$	3,975	$	4	$	(26)	$	3,953
U.S. states, municipalities and political subdivisions		847		19		(12)		854
Foreign governments		8,572		274		(24)		8,822
Corporate bonds		6,279		588		(5)		6,862
Mortgage-backed securities		772		92		(2)		862
	$	20,445	$	977	$	(69)	$	21,353

Schedule of amortized cost and estimated fair value of securities with fixed maturities

The amortized cost and estimated fair value of fixed maturity securities at September 30, 2018 are summarized below by contractual maturity dates. Amounts are in millions. Actual maturities may differ from contractual maturities due to early call or prepayment rights held by issuers.

	Due in one   year or less		Due after one year through five years		Due after five years through ten years		Due after     ten years		Mortgage- backed     securities		Total
Amortized cost	$	7,275	$	9,057	$	387	$	574	$	502	$	17,795
Fair value		7,274		9,108		435		900		554		18,271

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Investments in equity securities (Tables)

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of investments in equity securities

Our investments in equity securities as of September 30, 2018 and December 31, 2017 are summarized based on the primary industry of the investee as follows (in millions).

	Cost Basis		Net Unrealized Gains		Fair     Value
September 30, 2018 *
Banks, insurance and finance	$	42,010	$	51,499	$	93,509
Consumer products		38,793		39,858		78,651
Commercial, industrial and other		21,035		14,137		35,172
	$	101,838	$	105,494	$	207,332

* Approximately 69% of the aggregate fair value was concentrated in five companies (American Express Company – $16.1 billion; Apple Inc. – $57.6 billion; Bank of America Corporation – $26.5 billion; The Coca-Cola Company – $18.5 billion and Wells Fargo & Company – $24.4 billion).

	Cost Basis		Net Unrealized Gains		Fair         Value
December 31, 2017 *
Banks, insurance and finance	$	25,783	$	55,026	$	80,809
Consumer products		25,177		25,698		50,875
Commercial, industrial and other		23,716		15,140		38,856
	$	74,676	$	95,864	$	170,540

* Approximately 65% of the aggregate fair value was concentrated in five companies (American Express Company – $15.1 billion; Apple Inc. – $28.2 billion; Bank of America Corporation – $20.7 billion; The Coca-Cola Company – $18.4 billion and Wells Fargo & Company – $29.3 billion).

Investments in equity securities are reflected in our Consolidated Balance Sheets as follows (in millions).

	September 30,     2018		December 31,     2017
Insurance and other	$	201,226	$	164,026
Railroad, utilities and energy *		1,616		1,961
Finance and financial products *		4,490		4,553
	$	207,332	$	170,540

* Included in other assets.

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Equity Method Investments (Tables)

9 Months Ended

Sep. 30, 2018

Equity Method Investments and Joint Ventures [Abstract]

Summarized consolidated financial information of Kraft Heinz

Summarized consolidated financial information of Kraft Heinz follows (in millions).

					September 29,   2018		December 30,   2017
Assets					$	119,730	$	120,232
Liabilities						54,152		53,985
	Third Quarter				First Nine Months
	2018		2017		2018		2017
Sales	$	6,378	$	6,280	$	19,368	$	19,241
Net earnings attributable to Kraft Heinz common shareholders	$	630	$	944	$	2,379	$	2,996

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Investment gains/losses (Tables)

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Summary of investment gains and losses

A summary of investment gains and losses in the third quarter and first nine months of 2018 and 2017 follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Equity securities:
Unrealized investment gains/losses on securities held at the end of the period	$	14,294	$	—	$	12,126	$	—
Investment gains/losses during 2018 on securities sold in 2018		244		—		307		—
Gross realized gains		—		1,011		—		1,795
Gross realized losses		—		(419)		—		(626)
		14,538		592		12,433		1,169
Fixed maturity securities:
Gross realized gains		44		56		451		82
Gross realized losses		(10)		(2)		(152)		(16)
Other		(3)		11		18		27
	$	14,569	$	657	$	12,750	$	1,262

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Receivables (Tables)

9 Months Ended

Sep. 30, 2018

Insurance and Other [Member]

Schedule of receivables

Receivables of insurance and other businesses are comprised of the following (in millions).

	September 30, 2018		December 31, 2017
Insurance premiums receivable	$	13,002	$	11,058
Reinsurance recoverable on unpaid losses		2,944		3,201
Trade receivables		13,197		11,756
Other		3,121		2,925
Allowances for uncollectible accounts		(380)		(362)
	$	31,884	$	28,578

Finance and Financial Products [Member]

Schedule of receivables

A summary of loans and finance receivables of our finance and financial products businesses follows (in millions).

	September 30, 2018		December 31, 2017
Loans and finance receivables before allowances and discounts	$	14,832	$	14,126
Allowances for uncollectible loans		(183)		(180)
Unamortized acquisition discounts		(172)		(198)
	$	14,477	$	13,748

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Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories are comprised of the following (in millions).

	September 30, 2018		December 31, 2017
Raw materials	$	3,326	$	2,997
Work in process and other		2,232		2,315
Finished manufactured goods		4,150		4,179
Goods acquired for resale		7,085		6,696
	$	16,793	$	16,187

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Property, plant and equipment and assets held for lease (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of depreciation expense

A summary of depreciation expense for the first nine months of 2018 and 2017 follows (in millions).

	First Nine Months
	2018		2017
Insurance and other	$	1,954	$	1,636
Railroad, utilities and energy		3,678		3,604
Finance and financial products		485		487
	$	6,117	$	5,727

Insurance and Other [Member]

Schedule of property, plant and equipment

A summary of property, plant and equipment of our insurance and other businesses follows (in millions).

	September 30, 2018		December 31, 2017
Land	$	2,272	$	2,292
Buildings and improvements		9,034		8,810
Machinery and equipment		28,594		21,935
Furniture, fixtures and other		4,972		4,387
		44,872		37,424
Accumulated depreciation		(20,515)		(17,320)
	$	24,357	$	20,104

Finance and Financial Products [Member]

Schedule of property, plant and equipment

Assets held for lease and property, plant and equipment of our finance and financial products businesses are summarized below (in millions). Assets held for lease include railcars, intermodal tank containers, cranes, over-the-road trailers, storage units and furniture.

	September 30, 2018		December 31, 2017
Assets held for lease	$	12,736	$	12,318
Land		240		231
Buildings, machinery and other		1,527		1,444
		14,503		13,993
Accumulated depreciation		(4,230)		(4,062)
	$	10,273	$	9,931

Railroad, Utilities and Energy [Member]

Schedule of property, plant and equipment

A summary of property, plant and equipment of our railroad and our utilities and energy businesses follows (in millions). The utility generation, transmission and distribution systems and interstate natural gas pipeline assets are owned by regulated public utility and natural gas pipeline subsidiaries.

	September 30, 2018		December 31, 2017
Railroad:
Land, track structure and other roadway	$	58,755	$	57,408
Locomotives, freight cars and other equipment		12,731		12,543
Construction in progress		910		989
		72,396		70,940
Accumulated depreciation		(9,596)		(8,627)
		62,800		62,313
Utilities and energy:
Utility generation, transmission and distribution systems		75,751		74,660
Interstate natural gas pipeline assets		7,295		7,176
Independent power plants and other assets		8,156		7,499
Construction in progress		3,724		2,556
		94,926		91,891
Accumulated depreciation		(27,339)		(26,020)
		67,587		65,871
	$	130,387	$	128,184

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Goodwill and other intangible assets (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Reconciliation of the change in goodwill

A reconciliation of the change in the carrying value of goodwill is as follows (in millions).

	September 30, 2018		December 31, 2017
Balance at beginning of year	$	81,258	$	79,486
Acquisitions of businesses		250		1,545
Other, including foreign currency translation		(181)		227
Balance at end of period	$	81,327	$	81,258

Schedule of intangible assets

Other intangible assets are summarized as follows (in millions).

	September 30, 2018				December 31, 2017
	Gross carrying amount		Accumulated   amortization		Gross carrying amount		Accumulated   amortization
Insurance and other	$	40,288	$	8,662	$	40,225	$	7,707
Railroad, utilities and energy		1,026		362		988		324
	$	41,314	$	9,024	$	41,213	$	8,031
Trademarks and trade names	$	5,396	$	744	$	5,381	$	692
Patents and technology		4,408		2,716		4,341		2,493
Customer relationships		28,343		4,351		28,322		3,722
Other		3,167		1,213		3,169		1,124
	$	41,314	$	9,024	$	41,213	$	8,031

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Derivative contracts (Tables) - Finance and Financial Products [Member]

9 Months Ended

Sep. 30, 2018

Derivative contracts outstanding

The liabilities and related notional values of such contracts follows (in millions).

	September 30, 2018				December 31, 2017
	Liabilities		Notional       Value		Liabilities		Notional       Value
Equity index put options	$	1,869	$	27,434(1)	$	2,172	$	28,753 (1)

⁽¹⁾  Represents the aggregate undiscounted amounts payable assuming that the value of each index is zero at each contract’s expiration date. Certain of these contracts are denominated in foreign currencies. Notional amounts are based on the foreign currency exchange rates as of each balance sheet date.

Derivative gains/losses included in the Consolidated Statements of Earnings

A summary of derivative contract gains/losses included in our Consolidated Statements of Earnings follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Equity index put options	$	137	$	308	$	303	$	703

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Supplemental cash flow information (Tables)

9 Months Ended

Sep. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule of supplemental cash flow information

Supplemental cash flow information follows (in millions).

	First Nine Months
	2018		2017
Cash paid during the period for:
Income taxes	$	3,977	$	1,774
Interest:
Insurance and other businesses		677		747
Railroad, utilities and energy businesses		2,129		2,111
Finance and financial products businesses		257		296
Non-cash investing and financing activities:
Liabilities assumed in connection with business acquisitions		93		685
Equity securities surrendered in connection with warrant exercise		—		4,965

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Unpaid losses and loss adjustment expenses (Tables)

9 Months Ended

Sep. 30, 2018

Insurance [Abstract]

Schedule of liability for unpaid claims and claims adjustment expense

Reconciliations of the changes in claim liabilities, excluding liabilities under retroactive reinsurance contracts (see Note 16), for the nine months ending September 30, 2018 and 2017 follow (in millions).

	2018		2017
Balances – beginning of year:
Gross liabilities	$	61,122	$	53,379
Reinsurance recoverable on unpaid losses		(3,201)		(3,338)
Net liabilities		57,921		50,041
Incurred losses and loss adjustment expenses:
Current accident year events		29,071		28,632
Prior accident years’ events		(1,566)		(461)
Total incurred losses and loss adjustment expenses		27,505		28,171
Paid losses and loss adjustment expenses:
Current accident year events		(12,474)		(11,539)
Prior accident years’ events		(11,516)		(9,952)
Total payments		(23,990)		(21,491)
Foreign currency translation adjustment		(117)		603
Balances – September 30:
Net liabilities		61,319		57,324
Reinsurance recoverable on unpaid losses		2,944		3,254
Gross liabilities	$	64,263	$	60,578

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Retroactive reinsurance contracts (Tables)

9 Months Ended

Sep. 30, 2018

Text Block [Abstract]

Reconciliation of changes in retroactive reinsurance claim liabilities and deferred charge assets

Reconciliations of the changes in estimated liabilities for retroactive reinsurance unpaid losses and loss adjustment expenses (“claim liabilities”) and related deferred charge reinsurance assumed assets for the nine months ending September 30, 2018 and 2017 follows (in millions).

	2018				2017
	Unpaid losses and loss adjustment expenses		Deferred charges reinsurance assumed		Unpaid losses and loss adjustment expenses		Deferred charges reinsurance assumed
Balances – beginning of year:	$	42,937	$	(15,278)	$	24,972	$	(8,047)
Incurred losses and loss adjustment expenses
Current year contracts		—		—		17,213		(6,170)
Prior years’ contracts		(36)		827		(409)		645
Total		(36)		827		16,804		(5,525)
Paid losses and loss adjustment expenses		(966)		—		(783)		—
Balances – September 30:	$	41,935	$	(14,451)	$	40,993	$	(13,572)
Incurred losses and loss adjustment expenses, net of deferred charges	$	791			$	11,279

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Notes payable and other borrowings (Tables)

9 Months Ended

Sep. 30, 2018

Insurance and Other [Member]

Schedule of short and long term outstanding debt disclosure

Notes payable and other borrowings are summarized below (dollars in millions). The weighted average interest rates and maturity date ranges shown in the following tables are based on borrowings as of September 30, 2018.

	Weighted Average Interest Rate			September 30, 2018		December 31, 2017
Insurance and other:
Issued by Berkshire:
U.S. Dollar denominated borrowings due 2018-2047		3.1	%	$	9,058	$	10,603
Euro denominated borrowings due 2020-2035		1.1	%		7,897		8,164
Short-term subsidiary borrowings		4.1	%		1,733		1,832
Other subsidiary borrowings due 2018-2045		4.0	%		5,583		6,725
				$	24,271	$	27,324

Finance and Financial Products [Member]

Schedule of short and long term outstanding debt disclosure

	Weighted Average  Interest Rate		September 30,  2018			December 31,  2017
Finance and financial products:
Issued by Berkshire Hathaway Finance Corporation (“BHFC”) due 2019-2048		3.3%		$	10,649		$	12,926
Issued by other subsidiaries due 2018-2028		3.6%			121			159
				$	10,770		$	13,085

Railroad, Utilities and Energy [Member]

Schedule of short and long term outstanding debt disclosure

	Weighted Average  Interest Rate		September 30,  2018		December 31,  2017
Railroad, utilities and energy:
Issued by Berkshire Hathaway Energy Company (“BHE”) and its subsidiaries:
BHE senior unsecured debt due 2018-2049		4.5%	$	8,970	$	6,452
Subsidiary and other debt due 2019-2064		4.7%		28,588		28,739
Short-term debt		3.0%		1,784		4,488
Issued by BNSF due 2018-2097		4.7%		23,257		22,499
			$	62,599	$	62,178

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Fair value measurements (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Financial assets and liabilities measured at fair value on a recurring basis

Our financial assets and liabilities are summarized below as of September 30, 2018 and December 31, 2017 with fair values shown according to the fair value hierarchy (in millions). The carrying values of cash and cash equivalents, U.S. Treasury Bills, receivables and accounts payable, accruals and other liabilities are considered to be reasonable estimates of their fair values.

	Carrying     Value		Fair Value		Quoted Prices     (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2018
Investments in fixed maturity securities:
U.S. Treasury, U.S. government corporations and agencies	$	3,599	$	3,599	$	2,378	$	1,221	$	—
U.S. states, municipalities and political subdivisions		290		290		—		290		—
Foreign governments		7,370		7,370		5,162		2,208		—
Corporate bonds		6,458		6,458		—		6,453		5
Mortgage-backed securities		554		554		—		554		—
Investments in equity securities		207,332		207,332		206,985		47		300
Investment in Kraft Heinz common stock		17,453		17,935		17,935		—		—
Loans and finance receivables		14,477		14,735		—		59		14,676
Derivative contract assets (1)		154		154		3		41		110
Derivative contract liabilities:
Railroad, utilities and energy (1)		80		80		1		63		16
Equity index put options		1,869		1,869		—		—		1,869
Notes payable and other borrowings:
Insurance and other		24,271		24,422		—		24,422		—
Railroad, utilities and energy		62,599		66,823		—		66,823		—
Finance and financial products		10,770		10,979		—		10,953		26
December 31, 2017
Investments in fixed maturity securities:
U.S. Treasury, U.S. government corporations and agencies	$	3,953	$	3,953	$	2,360	$	1,593	$	—
U.S. states, municipalities and political subdivisions		854		854		—		854		—
Foreign governments		8,822		8,822		6,946		1,876		—
Corporate bonds		6,862		6,862		—		6,856		6
Mortgage-backed securities		862		862		—		862		—
Investments in equity securities		170,540		170,540		170,494		46		—
Investment in Kraft Heinz common stock		17,635		25,306		25,306		—		—
Loans and finance receivables		13,748		14,136		—		17		14,119
Derivative contract assets (1)		142		142		1		28		113
Derivative contract liabilities:
Railroad, utilities and energy (1)		82		82		3		69		10
Equity index put options		2,172		2,172		—		—		2,172
Notes payable and other borrowings:
Insurance and other		27,324		28,180		—		28,180		—
Railroad, utilities and energy		62,178		70,538		—		70,538		—
Finance and financial products		13,085		13,582		—		13,577		5

(1) Assets are included in other assets and liabilities are included in accounts payable, accruals and other liabilities.

Reconciliations of assets and liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3)

Reconciliations of assets and liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) for the nine months ending September 30, 2018 and 2017 follow (in millions).

	Investments   in equity and fixed maturity securities		Net     derivative     contract liabilities
Nine months ending September 30, 2018
Balance at December 31, 2017	$	6	$	(2,069)
Gains (losses) included in:
Earnings		—		446
Regulatory assets and liabilities		—		(11)
Acquisitions, dispositions and settlements		(1)		(141)
Balance at September 30, 2018	$	5	$	(1,775)
Nine months ending September 30, 2017
Balance at December 31, 2016	$	17,321	$	(2,824)
Gains (losses) included in:
Earnings		—		822
Other comprehensive income		1,157		(3)
Regulatory assets and liabilities		—		(5)
Acquisitions, dispositions and settlements		(58)		(78)
Transfers into/out of Level 3		(18,413)		—
Balance at September 30, 2017	$	7	$	(2,088)

Fair value assets and liabilities measured on recurring basis, unobservable inputs, additional information

Quantitative information as of September 30, 2018, with respect to assets and liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) follows (in millions).

	Fair Value		Principal Valuation Techniques	Unobservable Inputs		Weighted   Average
Derivative contract liabilities – Equity index put options	$	1,869	Option pricing model		Volatility		16%

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Common stock (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Changes in issued, treasury and outstanding Berkshire common stock

Changes in Berkshire’s issued, treasury and outstanding common stock during the nine months ending September 30, 2018 are shown in the table below. In addition to our common stock, 1,000,000 shares of preferred stock are authorized, but none are issued.

	Class A, $5 Par Value         (1,650,000 shares authorized)						Class B, $0.0033 Par Value (3,225,000,000 shares authorized)
	Issued		Treasury		Outstanding		Issued		Treasury		Outstanding
Balance at December 31, 2017		762,755		(11,680)		751,075		1,342,066,749		(1,409,762)		1,340,656,987
Conversions of Class A common stock to Class B common stock and exercises of replacement stock options issued in a business acquisition		(16,850)		—		(16,850)		25,886,063		—		25,886,063
Treasury stock acquired		—		(225)		(225)		—		(4,139,192)		(4,139,192)
Balance at September 30, 2018		745,905		(11,905)		734,000		1,367,952,812		(5,548,954)		1,362,403,858

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Accumulated other comprehensive income (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Schedule of accumulated other comprehensive income

A summary of the net changes in after-tax accumulated other comprehensive income attributable to Berkshire Hathaway shareholders and amounts reclassified out of accumulated other comprehensive income for the nine months ending September 30, 2018 and 2017 follows (in millions).

	Unrealized appreciation of  investments, net		Foreign currency       translation		Prior service and actuarial gains/losses of defined benefit   pension plans		Other		Accumulated other  comprehensive  income
2018
Balance at December 31, 2017	$	62,093	$	(3,114)	$	(420)	$	12	$	58,571
Reclassifications to retained earnings upon adoption of new accounting standards		(61,340)		(65)		36		(6)		(61,375)
Other comprehensive income, net before reclassifications		(142)		(776)		(33)		(19)		(970)
Reclassifications into net earnings		(236)		—		76		7		(153)
Balance at September 30, 2018	$	375	$	(3,955)	$	(341)	$	(6)	$	(3,927)
Reclassifications into net earnings:
Reclassifications before income taxes	$	(299)	$	—	$	101	$	10	$	(188)
Applicable income taxes		(63)		—		25		3		(35)
	$	(236)	$	—	$	76	$	7	$	(153)
2017
Balance at December 31, 2016	$	43,176	$	(5,268)	$	(593)	$	(17)	$	37,298
Other comprehensive income, net before reclassifications		11,734		1,946		(90)		19		13,609
Reclassifications into net earnings		(803)		—		61		18		(724)
Balance at September 30, 2017	$	54,107	$	(3,322)	$	(622)	$	20	$	50,183
Reclassifications into net earnings:
Reclassifications before income taxes	$	(1,235)	$	—	$	82	$	32	$	(1,121)
Applicable income taxes		(432)		—		21		14		(397)
	$	(803)	$	—	$	61	$	18	$	(724)

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Business segment data (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Schedule of revenues and earnings by segment

 Revenues by segment for the third quarter and first nine months of 2018 and 2017 were as follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Operating Businesses:
Insurance:
Underwriting:
GEICO	$	8,506	$	7,543	$	24,705	$	21,632
Berkshire Hathaway Reinsurance Group		3,777		3,954		11,229		20,550
Berkshire Hathaway Primary Group		2,050		1,852		5,921		5,287
Investment income		1,446		1,248		4,058		3,664
Total insurance		15,779		14,597		45,913		51,133
BNSF		6,147		5,314		17,649		15,749
Berkshire Hathaway Energy		5,706		5,351		15,268		14,184
Manufacturing		13,552		12,819		40,339		37,654
McLane Company		12,822		12,798		37,438		37,480
Service and retailing		6,974		6,527		20,623		19,170
Finance and financial products		2,432		2,153		6,861		6,019
		63,412		59,559		184,091		181,389
Reconciliation of segments to consolidated amount:
Corporate, eliminations and other		38		(52)		32		(256)
	$	63,450	$	59,507	$	184,123	$	181,133

Earnings before income taxes by segment for the third quarter and first nine months of 2018 and 2017 were as follows (in millions).

	Third Quarter				First Nine Months
	2018		2017		2018		2017
Operating Businesses:
Insurance:
Underwriting:
GEICO	$	627	$	(416)	$	1,977	$	(122)
Berkshire Hathaway Reinsurance Group		(163)		(1,845)		(124)		(2,963)
Berkshire Hathaway Primary Group		135		52		468		473
Investment income		1,455		1,246		4,052		3,658
Total insurance		2,054		(963)		6,373		1,046
BNSF		1,879		1,710		5,047		4,592
Berkshire Hathaway Energy		1,165		1,243		2,238		2,481
Manufacturing		2,012		2,002		6,002		5,428
McLane Company		44		45		171		202
Service and retailing		628		491		1,840		1,439
Finance and financial products		530		496		1,589		1,438
		8,312		5,024		23,260		16,626
Reconciliation of segments to consolidated amount:
Investment and derivative contract gains/losses		14,706		965		13,053		1,965
Interest expense, not allocated to segments		(60)		(386)		(77)		(1,243)
Equity method investments		316		305		1,044		932
Corporate, eliminations and other		(127)		(278)		(558)		(833)
	$	23,147	$	5,630	$	36,722	$	17,447

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Summary of effects of initial adoption of ASU 2016-01, ASU 2018-02 and ASC 606 (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets	$ 736,459		$ 702,095
Liabilities	357,040		350,141
Accumulated other comprehensive income	(3,927)		58,571
Retained earnings	346,503		255,786
Total shareholders' equity	$ 379,419		$ 351,954	$ 310,921	$ 285,428
ASU 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated other comprehensive income		$ 84
Retained earnings		(84)
ASC 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets		3,382
Liabilities		3,453
Retained earnings		(71)
Total shareholders' equity		(71)
ASU 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated other comprehensive income		(61,459)
Retained earnings		61,459
Adjustments for New Accounting Pronouncements [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets		3,382
Liabilities		3,453
Accumulated other comprehensive income		(61,375)
Retained earnings		61,304
Total shareholders' equity		$ (71)

XML

New Accounting Pronouncements - Narrative (Detail) - USD ($) $ in Millions	Jan. 01, 2019	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Insurance and Other [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, net		$ 24,357		$ 20,104
Aircraft Sold Under Fractional Aircraft Ownership Programs [Member] | Insurance and Other [Member] | ASC 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other liabilities			$ 3,500
Aircraft Sold Under Fractional Aircraft Ownership Programs [Member] | Insurance and Other [Member] | Machinery and equipment [Member] | ASC 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, net			$ 3,500
Scenario, Forecast [Member] | ASU 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases, right of use assets	$ 6,000
Operating lease liabilities	$ 6,000

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Revenues from contracts with customers - Narrative (Detail) - Other Assets [Member] - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Utilities and Energy [Member]
Disaggregation of Revenue [Line Items]
Receivables	$ 2,200	$ 2,000
Unbilled revenue	624	665
Railroad [Member]
Disaggregation of Revenue [Line Items]
Receivables	$ 1,300	$ 1,200

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Revenue from contracts with customers disaggregated by reportable segment and source of revenue (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 45,427		$ 131,191
Other revenue	18,023		52,932
Total revenues	63,450	$ 59,507	184,123	$ 181,133
Industrial and Commercial Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,513		19,964
Building Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,477		9,828
Consumer Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,008		11,858
Grocery and Convenience Store Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8,709		25,128
Food and Beverage Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,079		12,203
Auto Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,083		6,087
Other Retail and Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,661		10,332
Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8,630		24,434
Electricity and Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,267		11,357
Manufacturing Businesses [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	13,478		40,149
Other revenue	51		132
Total revenues	13,529		40,281
Manufacturing Businesses [Member] | Industrial and Commercial Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,384		19,306
Manufacturing Businesses [Member] | Building Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,473		9,817
Manufacturing Businesses [Member] | Consumer Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,838		8,734
Manufacturing Businesses [Member] | Other Retail and Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	521		1,533
Manufacturing Businesses [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	262		759
McLane Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,804		37,384
Other revenue	18		54
Total revenues	12,822		37,438
McLane Company [Member] | Grocery and Convenience Store Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8,709		25,128
McLane Company [Member] | Food and Beverage Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,079		12,203
McLane Company [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	16		53
Service and Retailing Businesses [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,212		17,888
Other revenue	743		2,664
Total revenues	6,955		20,552
Service and Retailing Businesses [Member] | Industrial and Commercial Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	47		155
Service and Retailing Businesses [Member] | Auto Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,083		6,087
Service and Retailing Businesses [Member] | Other Retail and Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,117		8,734
Service and Retailing Businesses [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	965		2,912
BNSF [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,099		17,510
Other revenue	13		37
Total revenues	6,112		17,547
BNSF [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,099		17,510
Berkshire Hathaway Energy [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,407		14,383
Other revenue	299		885
Total revenues	5,706		15,268
Berkshire Hathaway Energy [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,140		3,026
Berkshire Hathaway Energy [Member] | Electricity and Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,267		11,357
Finance and Financial Products Reportable Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,427		3,877
Other revenue	1,004		2,980
Total revenues	2,431		6,857
Finance and Financial Products Reportable Segment [Member] | Industrial and Commercial Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	82		503
Finance and Financial Products Reportable Segment [Member] | Building Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4		11
Finance and Financial Products Reportable Segment [Member] | Consumer Products [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,170		3,124
Finance and Financial Products Reportable Segment [Member] | Other Retail and Wholesale Distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	23		65
Finance and Financial Products Reportable Segment [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	148		174
Insurance Corporate And Other [Member]
Disaggregation of Revenue [Line Items]
Other revenue	15,895		46,180
Total revenues	$ 15,895		$ 46,180

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Revenue from contracts with customers transaction price allocated to remaining performance obligations (Detail) $ in Millions	Sep. 30, 2018 USD ($)
Electricity and Natural Gas [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Transaction price allocated to remaining performance obligations	$ 6,890
Electricity and Natural Gas [Member] | Less than 12 Months [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Transaction price allocated to remaining performance obligations	$ 1,011
Performance obligations expected to be satisfied, period	1 year
Electricity and Natural Gas [Member] | Greater than 12 Months [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Transaction price allocated to remaining performance obligations	$ 5,879
Performance obligations expected to be satisfied, period
Industrial and Commercial Products [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Transaction price allocated to remaining performance obligations	$ 2,599
Industrial and Commercial Products [Member] | Less than 12 Months [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Transaction price allocated to remaining performance obligations	$ 50
Performance obligations expected to be satisfied, period	1 year
Industrial and Commercial Products [Member] | Greater than 12 Months [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Transaction price allocated to remaining performance obligations	$ 2,549
Performance obligations expected to be satisfied, period

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Investments in fixed maturity securities (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	$ 17,795	$ 20,445
Unrealized gains on fixed maturity securities	560	977
Unrealized losses on fixed maturity securities	(84)	(69)
Fair value of fixed maturity securities	18,271	21,353
U.S. Treasury, U.S. government corporations and agencies [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	3,626	3,975
Unrealized gains on fixed maturity securities	8	4
Unrealized losses on fixed maturity securities	(35)	(26)
Fair value of fixed maturity securities	3,599	3,953
U.S. states, municipalities and political subdivisions [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	276	847
Unrealized gains on fixed maturity securities	15	19
Unrealized losses on fixed maturity securities	(1)	(12)
Fair value of fixed maturity securities	290	854
Foreign governments [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	7,362	8,572
Unrealized gains on fixed maturity securities	45	274
Unrealized losses on fixed maturity securities	(37)	(24)
Fair value of fixed maturity securities	7,370	8,822
Corporate bonds [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	6,029	6,279
Unrealized gains on fixed maturity securities	436	588
Unrealized losses on fixed maturity securities	(7)	(5)
Fair value of fixed maturity securities	6,458	6,862
Mortgage-backed securities [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	502	772
Unrealized gains on fixed maturity securities	56	92
Unrealized losses on fixed maturity securities	(4)	(2)
Fair value of fixed maturity securities	$ 554	$ 862

XML

Investments in fixed maturity securities - Narrative (Detail)	Sep. 30, 2018
Foreign governments [Member] | AA or Higher Credit Rating [Member]
Summary of Investment Holdings [Line Items]
Percentage of fixed maturity investments by credit rating	89.00%

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Investments in fixed maturity securities - Amortized cost and estimated fair value of securities with fixed maturities (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Summary of Investment Holdings [Line Items]
Due in one year or less - amortized cost	$ 7,275
Due after one year through five years - amortized cost	9,057
Due after five years through ten years - amortized cost	387
Due after ten years - amortized cost	574
Amortized cost of fixed maturity securities	17,795	$ 20,445
Due in one year or less - fair value	7,274
Due after one year through five years - fair value	9,108
Due after five years through ten years - fair value	435
Due after ten years - fair value	900
Fair value of fixed maturity securities	18,271	21,353
Mortgage-backed securities [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of mortgage-backed securities	502
Amortized cost of fixed maturity securities	502	772
Fair value of mortgage-backed securities	554
Fair value of fixed maturity securities	$ 554	$ 862

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Investments in equity securities (Detail) - USD ($) $ in Millions	Sep. 30, 2018		Dec. 31, 2017
Summary of Investment Holdings [Line Items]
Cost Basis	$ 101,838		$ 74,676
Net Unrealized Gains	105,494		95,864
Fair Value	207,332	[1]	170,540	[2]
Banks, insurance and finance [Member]
Summary of Investment Holdings [Line Items]
Cost Basis	42,010		25,783
Net Unrealized Gains	51,499		55,026
Fair Value	93,509		80,809
Consumer products [Member]
Summary of Investment Holdings [Line Items]
Cost Basis	38,793		25,177
Net Unrealized Gains	39,858		25,698
Fair Value	78,651		50,875
Commercial, industrial and other [Member]
Summary of Investment Holdings [Line Items]
Cost Basis	21,035		23,716
Net Unrealized Gains	14,137		15,140
Fair Value	$ 35,172		$ 38,856

[1] Approximately 69% of the aggregate fair value was concentrated in five companies (American Express Company - $16.1 billion; Apple Inc. - $57.6 billion; Bank of America Corporation - $26.5 billion; The Coca-Cola Company - $18.5 billion and Wells Fargo & Company - $24.4 billion).

[2] Approximately 65% of the aggregate fair value was concentrated in five companies (American Express Company - $15.1 billion; Apple Inc. - $28.2 billion; Bank of America Corporation - $20.7 billion; The Coca-Cola Company - $18.4 billion and Wells Fargo & Company - $29.3 billion).

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Investments in equity securities (Parenthetical) (Detail) $ in Millions	Sep. 30, 2018 USD ($) Company		Dec. 31, 2017 USD ($) Company
Summary of Investment Holdings [Line Items]
Fair value of investments	$ 207,332	[1]	$ 170,540	[2]
American Express Company [Member]
Summary of Investment Holdings [Line Items]
Fair value of investments	16,100		15,100
Apple Inc. [Member]
Summary of Investment Holdings [Line Items]
Fair value of investments	57,600		28,200
Bank of America Corporation [Member]
Summary of Investment Holdings [Line Items]
Fair value of investments	26,500		20,700
The Coca-Cola Company [Member]
Summary of Investment Holdings [Line Items]
Fair value of investments	18,500		18,400
Wells Fargo & Company [Member]
Summary of Investment Holdings [Line Items]
Fair value of investments	$ 24,400		$ 29,300
Equity Securities [Member] | Investment Concentration [Member]
Summary of Investment Holdings [Line Items]
Concentration percentage	69.00%		65.00%
Number of companies in concentration percentage | Company	5		5

[1] Approximately 69% of the aggregate fair value was concentrated in five companies (American Express Company - $16.1 billion; Apple Inc. - $57.6 billion; Bank of America Corporation - $26.5 billion; The Coca-Cola Company - $18.5 billion and Wells Fargo & Company - $24.4 billion).

[2] Approximately 65% of the aggregate fair value was concentrated in five companies (American Express Company - $15.1 billion; Apple Inc. - $28.2 billion; Bank of America Corporation - $20.7 billion; The Coca-Cola Company - $18.4 billion and Wells Fargo & Company - $29.3 billion).

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Investments in equity securities - Fair value by segment (Detail) - USD ($) $ in Millions		Sep. 30, 2018		Dec. 31, 2017
Summary of Investment Holdings [Line Items]
Investments in equity securities		$ 207,332	[1]	$ 170,540	[2]
Insurance and Other [Member]
Summary of Investment Holdings [Line Items]
Investments in equity securities		201,226		164,026
Railroad, Utilities and Energy [Member] | Other Assets [Member]
Summary of Investment Holdings [Line Items]
Investments in equity securities	[3]	1,616		1,961
Finance and Financial Products [Member] | Other Assets [Member]
Summary of Investment Holdings [Line Items]
Investments in equity securities	[3]	$ 4,490		$ 4,553

[1] Approximately 69% of the aggregate fair value was concentrated in five companies (American Express Company - $16.1 billion; Apple Inc. - $57.6 billion; Bank of America Corporation - $26.5 billion; The Coca-Cola Company - $18.5 billion and Wells Fargo & Company - $24.4 billion).

[2] Approximately 65% of the aggregate fair value was concentrated in five companies (American Express Company - $15.1 billion; Apple Inc. - $28.2 billion; Bank of America Corporation - $20.7 billion; The Coca-Cola Company - $18.4 billion and Wells Fargo & Company - $29.3 billion).

[3] Included in other assets.

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Equity Method Investments - Narrative (Detail) $ in Millions		3 Months Ended		9 Months Ended
	Oct. 03, 2017 USD ($) Employee Location	Sep. 30, 2018 USD ($) shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) shares	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method earnings		$ 316	$ 305	$ 1,044	$ 932
The Kraft Heinz Company [Member]
Schedule of Equity Method Investments [Line Items]
Number of shares owned | shares		325,442,152		325,442,152
Equity method investment ownership percentage		26.70%		26.70%
Equity method investments		$ 17,453		$ 17,453		$ 17,635
Investment in Kraft Heinz common stock - fair value		$ 17,935		17,935		25,306
Equity method earnings				635	800
Common stock dividends received				610	594
Berkadia Commercial Mortgage LLC, Pilot Travel Centers LLC, d/b/a Pilot Flying J, and Electric Transmission Texas, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method earnings				$ 409	$ 132
Berkadia Commercial Mortgage LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage		50.00%		50.00%
Other Assets [Member] | Berkadia Commercial Mortgage LLC, Pilot Travel Centers LLC, d/b/a Pilot Flying J, and Electric Transmission Texas, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 3,600		$ 3,600		$ 3,400
Jefferies Financial Group Inc. [Member] | Berkadia Commercial Mortgage LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage		50.00%		50.00%
American Electric Power [Member] | Electric Transmission Texas, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage		50.00%		50.00%
Commercial Paper [Member] | Berkadia Commercial Mortgage LLC [Member]
Schedule of Equity Method Investments [Line Items]
Maximum outstanding balance of commercial paper borrowings		$ 1,500		$ 1,500
Insurance Group [Member] | Jefferies Financial Group Inc. [Member] | Berkadia Commercial Mortgage LLC [Member]
Schedule of Equity Method Investments [Line Items]
Reimbursement rate from joint venture partner of Company's surety bond claim losses				50.00%
Berkshire Hathaway Energy Company Subsidiary [Member] | Electric Transmission Texas, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage		50.00%		50.00%
Pilot Travel Centers LLC, d/b/a Pilot Flying J [Member]
Schedule of Equity Method Investments [Line Items]
Number of locations | Location	750
Pilot Travel Centers LLC, d/b/a Pilot Flying J [Member] | Haslam Family [Member]
Schedule of Equity Method Investments [Line Items]
Majority ownership percentage	50.10%
Pilot Travel Centers LLC, d/b/a Pilot Flying J [Member] | Third Party [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	11.30%
Pilot Travel Centers LLC, d/b/a Pilot Flying J [Member] | Berkshire Hathaway Inc. (Parent) [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	38.60%
Pilot Travel Centers LLC, d/b/a Pilot Flying J [Member] | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Number of team members | Employee	28,000
Annual revenues	$ 20,000
Pilot Travel Centers LLC, d/b/a Pilot Flying J [Member] | Agreement to Acquire Additional Interest in 2023 [Member] | Haslam Family [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
Pilot Travel Centers LLC, d/b/a Pilot Flying J [Member] | Agreement to Acquire Additional Interest in 2023 [Member] | Berkshire Hathaway Inc. (Parent) [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of additional interest to be acquired	41.40%

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Equity Method Investments - Consolidated financial information (Detail) - The Kraft Heinz Company [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017
Schedule of Equity Method Investments [Line Items]
Assets	$ 119,730		$ 119,730		$ 120,232
Liabilities	54,152		54,152		$ 53,985
Sales	6,378	$ 6,280	19,368	$ 19,241
Net earnings attributable to Kraft Heinz common shareholders	$ 630	$ 944	$ 2,379	$ 2,996

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Income taxes - Narrative (Detail) - USD ($) $ in Billions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	19.20%		25.30%	19.10%	27.20%
Statutory U.S. Corporate income tax rate				21.00%	35.00%
Provisional income tax expense for deemed repatriation of accumulated undistributed earnings of foreign subsidiaries		$ 1.4

XML

Summary of investment gains and losses (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Gain (Loss) on Securities [Line Items]
Equity securities - Unrealized investment gains/losses on securities held at the end of the period	$ 14,294		$ 12,126
Equity securities - Investment gains/losses during 2018 on securities sold in 2018	244		307
Investment gains (losses)	14,569	$ 657	12,750	$ 1,262
Fixed maturity securities - Gross realized gains	44	56	451	82
Fixed maturity securities - Gross realized losses	(10)	(2)	(152)	(16)
Equity Securities [Member]
Gain (Loss) on Securities [Line Items]
Gross realized gains		1,011		1,795
Gross realized losses		(419)		(626)
Investment gains (losses)	14,538	592	12,433	1,169
Other [Member]
Gain (Loss) on Securities [Line Items]
Investment gains (losses)	$ (3)	$ 11	$ 18	$ 27

XML

Investment gains/losses - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Sales and redemptions of equity securities		$ 14,164	$ 10,572
Taxable gains on sales of equity securities	$ 1,329	$ 2,688

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Receivables (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reinsurance recoverable on unpaid losses	$ 2,944	$ 3,201	$ 3,254	$ 3,338
Insurance and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Insurance premiums receivable	13,002	11,058
Reinsurance recoverable on unpaid losses	2,944	3,201
Trade receivables	13,197	11,756
Other	3,121	2,925
Allowances for uncollectible accounts	(380)	(362)
Total receivables of insurance and other businesses	31,884	28,578
Finance and Financial Products [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and finance receivables before allowances and discounts	14,832	14,126
Allowances for uncollectible loans	(183)	(180)
Unamortized acquisition discounts	(172)	(198)
Total loans and finance receivables of finance and financial products businesses	$ 14,477	$ 13,748

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Receivables - Narrative (Detail) - Finance and Financial Products [Member] - Loans and finance receivables [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provisions for loan losses	$ 109	$ 124
Loan charge-offs, net of recoveries	$ 106	$ 126
Percent of loan balances evaluated collectively for impairment	98.00%
Percent of loan balances considered to be performing	99.00%
Percent of loan balances considered to be current as to payment status	95.00%

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Inventories (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 3,326	$ 2,997
Work in process and other	2,232	2,315
Finished manufactured goods	4,150	4,179
Goods acquired for resale	7,085	6,696
Total inventory	$ 16,793	$ 16,187

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Property, plant and equipment and assets held for lease - Narrative (Detail) - Insurance and Other [Member] - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 24,357		$ 20,104
Property, plant and equipment, gross	44,872		37,424
Property, plant and equipment, accumulated depreciation	20,515		17,320
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 28,594		$ 21,935
ASC 606 [Member] | Aircraft Sold Under Fractional Aircraft Ownership Programs [Member]
Property, Plant and Equipment [Line Items]
Other liabilities		$ 3,500
ASC 606 [Member] | Machinery and equipment [Member] | Aircraft Sold Under Fractional Aircraft Ownership Programs [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net		3,500
Property, plant and equipment, gross		5,300
Property, plant and equipment, accumulated depreciation		$ 1,800

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Property, plant and equipment and assets held for lease (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Insurance and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 44,872	$ 37,424
Property, plant and equipment, accumulated depreciation	(20,515)	(17,320)
Total property, plant and equipment, net	24,357	20,104
Insurance and Other [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,272	2,292
Insurance and Other [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,034	8,810
Insurance and Other [Member] | Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	28,594	21,935
Insurance and Other [Member] | Furniture, fixtures and other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,972	4,387
Railroad [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	72,396	70,940
Property, plant and equipment, accumulated depreciation	(9,596)	(8,627)
Total property, plant and equipment, net	62,800	62,313
Railroad [Member] | Land, track structure and other roadway [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	58,755	57,408
Railroad [Member] | Locomotives, freight cars and other equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12,731	12,543
Railroad [Member] | Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	910	989
Utilities and Energy [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	94,926	91,891
Property, plant and equipment, accumulated depreciation	(27,339)	(26,020)
Total property, plant and equipment, net	67,587	65,871
Utilities and Energy [Member] | Utility generation, transmission and distribution systems [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	75,751	74,660
Utilities and Energy [Member] | Interstate natural gas pipeline assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,295	7,176
Utilities and Energy [Member] | Independent power plants and other assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,156	7,499
Utilities and Energy [Member] | Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,724	2,556
Railroad, Utilities and Energy [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, net	130,387	128,184
Finance and Financial Products [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment and assets held for lease, gross	14,503	13,993
Property, plant and equipment and assets held for lease, accumulated depreciation	(4,230)	(4,062)
Total property, plant and equipment and assets held for lease, net	10,273	9,931
Finance and Financial Products [Member] | Assets held for lease [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment and assets held for lease, gross	12,736	12,318
Finance and Financial Products [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment and assets held for lease, gross	240	231
Finance and Financial Products [Member] | Buildings, machinery and other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment and assets held for lease, gross	$ 1,527	$ 1,444

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Property, plant and equipment and assets held for lease - Depreciation expense (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 6,117	$ 5,727
Insurance and Other [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	1,954	1,636
Railroad, Utilities and Energy [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	3,678	3,604
Finance and Financial Products [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 485	$ 487

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Goodwill and other intangible assets - Goodwill (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Balance at beginning of year	$ 81,258	$ 79,486
Acquisitions of businesses	250	1,545
Other, including foreign currency translation	(181)	227
Balance at end of period	$ 81,327	$ 81,258

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Goodwill and other intangible assets - Intangible assets (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 41,314	$ 41,213
Accumulated amortization	9,024	8,031
Insurance and Other [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount	40,288	40,225
Accumulated amortization	8,662	7,707
Railroad, Utilities and Energy [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,026	988
Accumulated amortization	362	324
Trademarks and trade names [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount	5,396	5,381
Accumulated amortization	744	692
Customer relationships [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount	28,343	28,322
Accumulated amortization	4,351	3,722
Other intangible assets [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount	3,167	3,169
Accumulated amortization	1,213	1,124
Patents and technology [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount	4,408	4,341
Accumulated amortization	$ 2,716	$ 2,493

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Goodwill and other intangible assets - Intangible assets - Narrative (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 1,052	$ 1,108
Intangible assets with indefinite lives, excluding goodwill	$ 18,900		$ 18,900

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Derivative contracts (Detail) - Finance and Financial Products [Member] - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Liabilities		$ 1,869	$ 2,172
Not Designated as Hedging Instrument [Member] | Equity Index Put Options [Member]
Derivative [Line Items]
Liabilities		1,869	2,172
Notional Value	[1]	$ 27,434	$ 28,753

[1] Represents the aggregate undiscounted amounts payable assuming that the value of each index is zero at each contract's expiration date. Certain of these contracts are denominated in foreign currencies. Notional amounts are based on the foreign currency exchange rates as of each balance sheet date.

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Derivative contracts - Gains and losses (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains/losses	$ 137	$ 308	$ 303	$ 703
Finance and Financial Products [Member] | Not Designated as Hedging Instrument [Member] | Equity Index Put Options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains/losses	$ 137	$ 308	$ 303	$ 703

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Derivative contracts - Narrative (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Finance and Financial Products [Member]
Derivative [Line Items]
Liabilities	$ 1,869,000,000	$ 2,172,000,000
Finance and Financial Products [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Collateral posting requirements under contracts with collateral provisions	0
Additional collateral posting requirements	$ 1,100,000,000
Finance and Financial Products [Member] | Not Designated as Hedging Instrument [Member] | Equity Index Put Options [Member]
Derivative [Line Items]
Weighted average remaining life of derivative contracts	2 years 3 months
Premiums received at contract inception dates	$ 4,100,000,000
Aggregate intrinsic value of equity index put option contracts	919,000,000	789,000,000
Liabilities	$ 1,869,000,000	2,172,000,000
Finance and Financial Products [Member] | Not Designated as Hedging Instrument [Member] | Equity Index Put Options [Member] | Maximum [Member]
Derivative [Line Items]
Derivative inception month and year	2008-03
Derivative maturity month and year	2026-01
Finance and Financial Products [Member] | Not Designated as Hedging Instrument [Member] | Equity Index Put Options [Member] | Minimum [Member]
Derivative [Line Items]
Derivative maturity month and year	2019-04
Other Assets [Member] | Utilities and Energy [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Assets	$ 154,000,000	142,000,000
Accounts Payable, Accruals and Other Liabilities [Member] | Utilities and Energy [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liabilities	$ 80,000,000	$ 82,000,000

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Supplemental cash flow information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Supplemental Cash Flow Information [Line Items]
Cash paid during the period for income taxes	$ 3,977	$ 1,774
Liabilities assumed in connection with business acquisitions	93	685
Equity securities surrendered in connection with warrant exercise		4,965
Insurance and Other [Member]
Supplemental Cash Flow Information [Line Items]
Cash paid during the period for interest	677	747
Railroad, Utilities and Energy [Member]
Supplemental Cash Flow Information [Line Items]
Cash paid during the period for interest	2,129	2,111
Finance and Financial Products [Member]
Supplemental Cash Flow Information [Line Items]
Cash paid during the period for interest	$ 257	$ 296

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Unpaid losses and loss adjustment expenses - Reconciliation of changes in claim liabilities (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Gross liabilities at beginning of year	$ 60,578	$ 61,122	$ 53,379
Reinsurance recoverable on unpaid losses at beginning of year	(3,254)	(3,201)	(3,338)
Net liabilities at beginning of year	57,324	57,921	50,041
Net liabilities at end of period	57,921	61,319	57,324
Reinsurance recoverable on unpaid losses at end of period	3,201	2,944	3,254
Gross liabilities at end of period	$ 61,122	64,263	60,578
Property and Casualty Insurance and Reinsurance, Excluding Retroactive Reinsurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses, current accident year events		29,071	28,632
Incurred losses and loss adjustment expenses, prior accident years' events		(1,566)	(461)
Total incurred losses and loss adjustment expenses		27,505	28,171
Paid losses and loss adjustment expenses, current accident year events		(12,474)	(11,539)
Paid losses and loss adjustment expenses, prior accident years' events		(11,516)	(9,952)
Total payments		(23,990)	(21,491)
Foreign currency translation adjustment		$ (117)	$ 603

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Unpaid losses and loss adjustment expenses - Narrative (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Property and Casualty Insurance and Reinsurance, Excluding Retroactive Reinsurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses for (reductions of) prior years' accident events	$ (1,566)	$ (461)
Primary Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses for (reductions of) prior years' accident events	(985)	(569)
Private Passenger Automobile Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses for (reductions of) prior years' accident events	(478)	37
Property and Casualty Reinsurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses for (reductions of) prior years' accident events	$ (581)	$ 108

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Retroactive reinsurance contracts - Reconciliation of changes in claim liabilities and deferred charge assets (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Unpaid losses and loss adjustment expenses, beginning of year	$ 40,993	$ 42,937	$ 24,972
Unpaid losses and loss adjustment expenses, end of period	42,937	41,935	40,993
Deferred charges reinsurance assumed, beginning of year	(13,572)	(15,278)	(8,047)
Deferred charges reinsurance assumed, end of period	$ (15,278)	(14,451)	(13,572)
Retroactive Reinsurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses, prior years' contracts		791	236
Total incurred losses and loss adjustment expenses		791	11,279
Unpaid Losses and Loss Adjustment Expenses [Member] | Retroactive Reinsurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses, current year contracts			17,213
Incurred losses and loss adjustment expenses, prior years' contracts		(36)	(409)
Total incurred losses and loss adjustment expenses		(36)	16,804
Paid losses and loss adjustment expenses		(966)	(783)
Deferred Charges Reinsurance Assumed [Member] | Retroactive Reinsurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Incurred losses and loss adjustment expenses, current year contracts			(6,170)
Incurred losses and loss adjustment expenses, prior years' contracts		827	645
Total incurred losses and loss adjustment expenses		$ 827	$ (5,525)

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Retroactive reinsurance contracts - Narrative (Detail) - USD ($)		3 Months Ended	9 Months Ended
	Feb. 02, 2017	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2016
Effects of Reinsurance [Line Items]
Unpaid losses and loss adjustment expenses under retroactive reinsurance contracts		$ 42,937,000,000	$ 41,935,000,000	$ 40,993,000,000	$ 24,972,000,000
Deferred charges under retroactive reinsurance contracts		15,278,000,000	14,451,000,000	13,572,000,000	$ 8,047,000,000
Retroactive Reinsurance [Member]
Effects of Reinsurance [Line Items]
Incurred losses and loss adjustment expenses			791,000,000	11,279,000,000
Incurred losses and loss adjustment expenses, prior years' contracts			791,000,000	236,000,000
NICO [Member] | AIG [Member] | Retroactive Reinsurance [Member]
Effects of Reinsurance [Line Items]
Percentage of losses and allocated loss adjustment expenses reinsured in excess of retained amount	80.00%
Losses and allocated loss adjustment expenses retained amount	$ 25,000,000,000
Premiums earned	10,200,000,000
Incurred losses and loss adjustment expenses	10,200,000,000
Unpaid losses and loss adjustment expenses under retroactive reinsurance contracts	16,400,000,000	18,200,000,000	18,200,000,000
Deferred charges under retroactive reinsurance contracts	6,200,000,000	7,500,000,000	7,100,000,000
NICO [Member] | AIG [Member] | Retroactive Reinsurance [Member] | Maximum [Member]
Effects of Reinsurance [Line Items]
Losses and allocated loss adjustment expenses reinsured in excess of retained amount	$ 25,000,000,000
Unpaid Losses and Loss Adjustment Expenses [Member] | Retroactive Reinsurance [Member]
Effects of Reinsurance [Line Items]
Incurred losses and loss adjustment expenses			(36,000,000)	16,804,000,000
Incurred losses and loss adjustment expenses, prior years' contracts			(36,000,000)	(409,000,000)
Unpaid Losses and Loss Adjustment Expenses [Member] | NICO [Member] | AIG [Member] | Retroactive Reinsurance [Member]
Effects of Reinsurance [Line Items]
Incurred losses and loss adjustment expenses		1,800,000,000
Deferred Charges Reinsurance Assumed [Member] | Retroactive Reinsurance [Member]
Effects of Reinsurance [Line Items]
Incurred losses and loss adjustment expenses			827,000,000	(5,525,000,000)
Incurred losses and loss adjustment expenses, prior years' contracts			$ 827,000,000	$ 645,000,000
Deferred Charges Reinsurance Assumed [Member] | NICO [Member] | AIG [Member] | Retroactive Reinsurance [Member]
Effects of Reinsurance [Line Items]
Incurred losses and loss adjustment expenses		$ (1,700,000,000)

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Notes payable and other borrowings (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Insurance and Other [Member]
Debt Instrument [Line Items]
Notes payable and other borrowings	$ 24,271	$ 27,324
Insurance and Other [Member] | Berkshire Hathaway Inc. (Parent) [Member] | U.S. Dollar Denominated [Member]
Debt Instrument [Line Items]
Notes payable and other borrowings	$ 9,058	10,603
Weighted average interest rate, percentage	3.10%
Insurance and Other [Member] | Berkshire Hathaway Inc. (Parent) [Member] | U.S. Dollar Denominated [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt maturity year	2018
Insurance and Other [Member] | Berkshire Hathaway Inc. (Parent) [Member] | U.S. Dollar Denominated [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt maturity year	2047
Insurance and Other [Member] | Berkshire Hathaway Inc. (Parent) [Member] | Euro Denominated [Member]
Debt Instrument [Line Items]
Notes payable and other borrowings	$ 7,897	8,164
Weighted average interest rate, percentage	1.10%
Insurance and Other [Member] | Berkshire Hathaway Inc. (Parent) [Member] | Euro Denominated [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt maturity year	2020
Insurance and Other [Member] | Berkshire Hathaway Inc. (Parent) [Member] | Euro Denominated [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt maturity year	2035
Insurance and Other [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Short-term debt	$ 1,733	1,832
Other borrowings	$ 5,583	6,725
Short-term debt, weighted average interest rate	4.10%
Weighted average interest rate, percentage	4.00%
Insurance and Other [Member] | Subsidiaries [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt maturity year	2018
Insurance and Other [Member] | Subsidiaries [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt maturity year	2045
Railroad, Utilities and Energy [Member]
Debt Instrument [Line Items]
Notes payable and other borrowings	$ 62,599	62,178
Railroad, Utilities and Energy [Member] | Subsidiaries [Member] | Berkshire Hathaway Energy [Member]
Debt Instrument [Line Items]
Weighted average interest rate, percentage	4.50%
Senior unsecured debt	$ 8,970	6,452
Railroad, Utilities and Energy [Member] | Subsidiaries [Member] | Berkshire Hathaway Energy [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt maturity year	2018
Railroad, Utilities and Energy [Member] | Subsidiaries [Member] | Berkshire Hathaway Energy [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt maturity year	2049
Railroad, Utilities and Energy [Member] | Subsidiaries [Member] | Berkshire Hathaway Energy Subsidiaries [Member]
Debt Instrument [Line Items]
Notes payable and other borrowings	$ 28,588	28,739
Weighted average interest rate, percentage	4.70%
Railroad, Utilities and Energy [Member] | Subsidiaries [Member] | Berkshire Hathaway Energy Subsidiaries [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt maturity year	2019
Railroad, Utilities and Energy [Member] | Subsidiaries [Member] | Berkshire Hathaway Energy Subsidiaries [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt maturity year	2064
Railroad, Utilities and Energy [Member] | Subsidiaries [Member] | Berkshire Hathaway Energy and Subsidiaries [Member]
Debt Instrument [Line Items]
Short-term debt	$ 1,784	4,488
Short-term debt, weighted average interest rate	3.00%
Railroad, Utilities and Energy [Member] | Subsidiaries [Member] | BNSF [Member]
Debt Instrument [Line Items]
Notes payable and other borrowings	$ 23,257	22,499
Weighted average interest rate, percentage	4.70%
Railroad, Utilities and Energy [Member] | Subsidiaries [Member] | BNSF [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt maturity year	2018
Railroad, Utilities and Energy [Member] | Subsidiaries [Member] | BNSF [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt maturity year	2097
Finance and Financial Products [Member]
Debt Instrument [Line Items]
Notes payable and other borrowings	$ 10,770	13,085
Finance and Financial Products [Member] | Subsidiaries [Member] | Berkshire Hathaway Finance Corporation [Member]
Debt Instrument [Line Items]
Notes payable and other borrowings	$ 10,649	12,926
Weighted average interest rate, percentage	3.30%
Finance and Financial Products [Member] | Subsidiaries [Member] | Berkshire Hathaway Finance Corporation [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt maturity year	2019
Finance and Financial Products [Member] | Subsidiaries [Member] | Berkshire Hathaway Finance Corporation [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt maturity year	2048
Finance and Financial Products [Member] | Subsidiaries [Member] | Other Subsidiaries [Member]
Debt Instrument [Line Items]
Notes payable and other borrowings	$ 121	$ 159
Weighted average interest rate, percentage	3.60%
Finance and Financial Products [Member] | Subsidiaries [Member] | Other Subsidiaries [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt maturity year	2018
Finance and Financial Products [Member] | Subsidiaries [Member] | Other Subsidiaries [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt maturity year	2028

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Notes payable and other borrowings - Narrative (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Insurance and Other [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Weighted average interest rate, percentage		4.00%	4.00%
Insurance and Other [Member] | Euro Denominated [Member] | Berkshire Hathaway Inc. (Parent) [Member]
Debt Instrument [Line Items]
Weighted average interest rate, percentage		1.10%	1.10%
Insurance and Other [Member] | Euro Denominated [Member] | Senior Notes [Member] | Berkshire Hathaway Inc. (Parent) [Member]
Debt Instrument [Line Items]
Increase (decrease) in carrying value of notes			$ (273)	$ 860
Insurance and Other [Member] | Euro Denominated [Member] | Senior Notes [Member] | Interest Expense [Member] | Berkshire Hathaway Inc. (Parent) [Member]
Debt Instrument [Line Items]
Increase (decrease) in interest expense attributable to changes in foreign currency exchange rates			(273)	$ 860
Berkshire Hathaway Energy and Subsidiaries [Member] | Railroad, Utilities and Energy [Member] | Debt Due 2020 To 2049 [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Principal amount of debt issued		$ 2,050	$ 5,500
Weighted average interest rate, percentage		3.60%	3.60%
BNSF [Member] | Railroad, Utilities and Energy [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Weighted average interest rate, percentage		4.70%	4.70%
Repayments of borrowings			$ 650
BNSF [Member] | Railroad, Utilities and Energy [Member] | Senior Unsecured Debentures [Member] | Debentures Due 2048 [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Principal amount of debt issued		$ 750	$ 1,500
Weighted average interest rate, percentage		4.10%	4.10%
Berkshire Hathaway Finance Corporation [Member] | Finance and Financial Products [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Weighted average interest rate, percentage		3.30%	3.30%
Berkshire Hathaway Finance Corporation [Member] | Finance and Financial Products [Member] | Senior Notes [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Repayments of borrowings			$ 4,600
Berkshire Hathaway Finance Corporation [Member] | Finance and Financial Products [Member] | Senior Notes [Member] | Notes Due 2048 at 4.2% [Member] | Subsidiaries [Member]
Debt Instrument [Line Items]
Principal amount of debt issued	$ 2,350
Debt instrument, interest rate, stated percentage	4.20%

XML

Notes payable and other borrowings - Credit agreements - Narrative (Detail) $ in Billions	Sep. 30, 2018 USD ($)
Line of Credit and Commercial Paper Facilities [Member] | Subsidiaries [Member]
Line of Credit Facility [Line Items]
Unused lines of credit available	$ 8.4
Line of Credit and Commercial Paper Facilities [Member] | Subsidiaries [Member] | Berkshire Hathaway Energy and Subsidiaries [Member]
Line of Credit Facility [Line Items]
Unused lines of credit available	6.8
Subsidiaries Excluding Berkshire Hathaway Finance Corporation [Member] | Berkshire Hathaway Inc. (Parent) [Member]
Line of Credit Facility [Line Items]
Guarantee obligation	$ 1.7

XML

Fair value measurements - Financial assets and liabilities (Detail) - USD ($) $ in Millions		Sep. 30, 2018		Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		$ 18,271		$ 21,353
Investments in equity securities		207,332	[1]	170,540	[2]
Railroad, Utilities and Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable and other borrowings - carrying value		62,599		62,178
Insurance and Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		18,271		21,353
Investments in equity securities		201,226		164,026
Investment in Kraft Heinz common stock - carrying value		17,453		17,635
Notes payable and other borrowings - carrying value		24,271		27,324
Finance and Financial Products [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and finance receivables - carrying value		14,477		13,748
Derivative contract liabilities		1,869		2,172
Notes payable and other borrowings - carrying value		10,770		13,085
Other Assets [Member] | Railroad, Utilities and Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in equity securities	[3]	1,616		1,961
Other Assets [Member] | Finance and Financial Products [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in equity securities	[3]	4,490		4,553
The Kraft Heinz Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Kraft Heinz common stock - carrying value		17,453		17,635
Investment in Kraft Heinz common stock - fair value		17,935		25,306
U.S. Treasury, U.S. government corporations and agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		3,599		3,953
U.S. states, municipalities and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		290		854
Foreign governments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		7,370		8,822
Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		6,458		6,862
Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		554		862
Fair Value, Measurements, Recurring [Member] | Quoted Prices (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in equity securities		206,985		170,494
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in equity securities		47		46
Loans and finance receivables - fair value		59		17
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Railroad, Utilities and Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable and other borrowings - fair value		66,823		70,538
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Insurance and Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable and other borrowings - fair value		24,422		28,180
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Finance and Financial Products [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable and other borrowings - fair value		10,953		13,577
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in equity securities		300
Loans and finance receivables - fair value		14,676		14,119
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Finance and Financial Products [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable and other borrowings - fair value		26		5
Fair Value, Measurements, Recurring [Member] | Equity Index Put Options [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract liabilities		1,869		2,172
Fair Value, Measurements, Recurring [Member] | Other Assets [Member] | Quoted Prices (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract assets	[4]	3		1
Fair Value, Measurements, Recurring [Member] | Other Assets [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract assets	[4]	41		28
Fair Value, Measurements, Recurring [Member] | Other Assets [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract assets	[4]	110		113
Fair Value, Measurements, Recurring [Member] | Accounts Payable, Accruals and Other Liabilities [Member] | Quoted Prices (Level 1) [Member] | Railroad, Utilities and Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract liabilities	[4]	1		3
Fair Value, Measurements, Recurring [Member] | Accounts Payable, Accruals and Other Liabilities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Railroad, Utilities and Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract liabilities	[4]	63		69
Fair Value, Measurements, Recurring [Member] | Accounts Payable, Accruals and Other Liabilities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Railroad, Utilities and Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract liabilities	[4]	16		10
Fair Value, Measurements, Recurring [Member] | The Kraft Heinz Company [Member] | Quoted Prices (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Kraft Heinz common stock - fair value		17,935		25,306
Fair Value, Measurements, Recurring [Member] | U.S. Treasury, U.S. government corporations and agencies [Member] | Quoted Prices (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		2,378		2,360
Fair Value, Measurements, Recurring [Member] | U.S. Treasury, U.S. government corporations and agencies [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		1,221		1,593
Fair Value, Measurements, Recurring [Member] | U.S. states, municipalities and political subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		290		854
Fair Value, Measurements, Recurring [Member] | Foreign governments [Member] | Quoted Prices (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		5,162		6,946
Fair Value, Measurements, Recurring [Member] | Foreign governments [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		2,208		1,876
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		6,453		6,856
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		5		6
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		554		862
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in equity securities		207,332		170,540
Loans and finance receivables - carrying value		14,477		13,748
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Railroad, Utilities and Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable and other borrowings - carrying value		62,599		62,178
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Insurance and Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable and other borrowings - carrying value		24,271		27,324
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Finance and Financial Products [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable and other borrowings - carrying value		10,770		13,085
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Equity Index Put Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract liabilities		1,869		2,172
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract assets	[4]	154		142
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Accounts Payable, Accruals and Other Liabilities [Member] | Railroad, Utilities and Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract liabilities	[4]	80		82
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | The Kraft Heinz Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Kraft Heinz common stock - carrying value		17,453		17,635
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | U.S. Treasury, U.S. government corporations and agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		3,599		3,953
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | U.S. states, municipalities and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		290		854
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Foreign governments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		7,370		8,822
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		6,458		6,862
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		554		862
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in equity securities		207,332		170,540
Loans and finance receivables - fair value		14,735		14,136
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Railroad, Utilities and Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable and other borrowings - fair value		66,823		70,538
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Insurance and Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable and other borrowings - fair value		24,422		28,180
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Finance and Financial Products [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable and other borrowings - fair value		10,979		13,582
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Equity Index Put Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract liabilities		1,869		2,172
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract assets	[4]	154		142
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Accounts Payable, Accruals and Other Liabilities [Member] | Railroad, Utilities and Energy [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract liabilities	[4]	80		82
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | The Kraft Heinz Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Kraft Heinz common stock - fair value		17,935		25,306
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | U.S. Treasury, U.S. government corporations and agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		3,599		3,953
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | U.S. states, municipalities and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		290		854
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Foreign governments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		7,370		8,822
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		6,458		6,862
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in fixed maturity securities		$ 554		$ 862

[1] Approximately 69% of the aggregate fair value was concentrated in five companies (American Express Company - $16.1 billion; Apple Inc. - $57.6 billion; Bank of America Corporation - $26.5 billion; The Coca-Cola Company - $18.5 billion and Wells Fargo & Company - $24.4 billion).

[2] Approximately 65% of the aggregate fair value was concentrated in five companies (American Express Company - $15.1 billion; Apple Inc. - $28.2 billion; Bank of America Corporation - $20.7 billion; The Coca-Cola Company - $18.4 billion and Wells Fargo & Company - $29.3 billion).

[3] Included in other assets.

[4] Assets are included in other assets and liabilities are included in accounts payable, accruals and other liabilities.

XML

Fair value measurements - Significant unobservable inputs (Detail) - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Fair Value Measurements Significant Unobservable Inputs [Line Items]
Net derivative contract liabilities - Beginning Balance	$ (2,069)	$ (2,824)
Net derivative contract liabilities - Gains (losses) included in earnings	446	822
Net derivative contract liabilities - Gains (losses) included in other comprehensive income		(3)
Net derivative contract liabilities - Gains (losses) included in regulatory assets and liabilities	(11)	(5)
Net derivative contract liabilities - Acquisitions, dispositions and settlements	(141)	(78)
Net derivative contract liabilities - Ending Balance	(1,775)	(2,088)
Investments in Equity and Fixed Maturity Securities [Member]
Fair Value Measurements Significant Unobservable Inputs [Line Items]
Beginning Balance	6	17,321
Gains (losses) included in other comprehensive income		1,157
Acquisitions, dispositions and settlements	(1)	(58)
Transfers into/out of Level 3		(18,413)
Ending Balance	$ 5	$ 7

XML

Fair value measurements - Other information (Detail) - Significant Unobservable Inputs (Level 3) [Member] - Equity Index Put Options [Member] - Fair Value, Measurements, Recurring [Member] $ in Millions	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative contract liabilities, fair value	$ 1,869	$ 2,172
Option Pricing Model [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative contract liabilities, fair value	$ 1,869
Option Pricing Model [Member] | Volatility [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Unobservable inputs	0.16

XML

Common stock - Narrative (Detail)	9 Months Ended
	Sep. 30, 2018 USD ($) Vote shares	Dec. 31, 2017 shares
Class of Stock [Line Items]
Preferred Stock, shares authorized	1,000,000
Preferred Stock, shares issued	0
Class A [Member]
Class of Stock [Line Items]
Number of votes entitled per share, number | Vote	1
Shares outstanding	734,000	751,075
Class B [Member]
Class of Stock [Line Items]
Number of votes entitled per share, number | Vote	0.0001
Economic equivalent of Class B share to Class A share	0.0667%
Number of shares of Class B stock obtainable from converting one Class A share	1,500
Shares outstanding	1,362,403,858	1,340,656,987
Equivalent Class A [Member]
Class of Stock [Line Items]
Shares outstanding	1,642,269	1,644,846
Common Stock Repurchase Program [Member]
Class of Stock [Line Items]
Shares repurchase, authorization description	For several years, Berkshire had a common stock repurchase program, which permitted Berkshire to repurchase its Class A and Class B shares at prices no higher than a 20% premium over the book value of the shares. On July 17, 2018, Berkshire’s Board of Directors authorized an amendment to the program, permitting Berkshire to repurchase shares any time that Warren Buffett, Berkshire’s Chairman of the Board and Chief Executive Officer, and Charlie Munger, a Vice-Chairman of the Board, believe that the repurchase price is below Berkshire’s intrinsic value, conservatively determined.
Minimum cash, cash equivalents and U.S. Treasury Bills threshold after repurchase of common stock shares, amount | $	$ 20,000,000,000

XML

Common stock (Detail) - shares	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Class A [Member]
Class of Stock [Line Items]
Shares issued	745,905	762,755
Treasury shares	(11,905)	(11,680)
Shares outstanding	734,000	751,075
Conversions of Class A common stock to Class B common stock and exercises of replacement stock options issued in a business acquisition	(16,850)
Treasury stock acquired	(225)
Class B [Member]
Class of Stock [Line Items]
Shares issued	1,367,952,812	1,342,066,749
Treasury shares	(5,548,954)	(1,409,762)
Shares outstanding	1,362,403,858	1,340,656,987
Conversions of Class A common stock to Class B common stock and exercises of replacement stock options issued in a business acquisition	25,886,063
Treasury stock acquired	(4,139,192)

XML

Common stock (Parenthetical) (Detail)	Sep. 30, 2018 $ / shares shares
Class A [Member]
Class of Stock [Line Items]
Common Stock, par value per share | $ / shares	$ 5
Common Stock, shares authorized | shares	1,650,000
Class B [Member]
Class of Stock [Line Items]
Common Stock, par value per share | $ / shares	$ 0.0033
Common Stock, shares authorized | shares	3,225,000,000

XML

Accumulated other comprehensive income (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 351,954	$ 285,428
Ending Balance	379,419	310,921
Unrealized appreciation of investments, net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	62,093	43,176
Reclassifications to retained earnings upon adoption of new accounting standards	(61,340)
Other comprehensive income, net before reclassifications	(142)	11,734
Reclassifications into net earnings	(236)	(803)
Ending Balance	375	54,107
Foreign currency translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,114)	(5,268)
Reclassifications to retained earnings upon adoption of new accounting standards	(65)
Other comprehensive income, net before reclassifications	(776)	1,946
Ending Balance	(3,955)	(3,322)
Prior service and actuarial gains/losses of defined benefit pension plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(420)	(593)
Reclassifications to retained earnings upon adoption of new accounting standards	36
Other comprehensive income, net before reclassifications	(33)	(90)
Reclassifications into net earnings	76	61
Ending Balance	(341)	(622)
Other AOCI transactions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	12	(17)
Reclassifications to retained earnings upon adoption of new accounting standards	(6)
Other comprehensive income, net before reclassifications	(19)	19
Reclassifications into net earnings	7	18
Ending Balance	(6)	20
Accumulated other comprehensive income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	58,571	37,298
Reclassifications to retained earnings upon adoption of new accounting standards	(61,375)
Other comprehensive income, net before reclassifications	(970)	13,609
Reclassifications into net earnings	(153)	(724)
Ending Balance	$ (3,927)	$ 50,183

XML

Accumulated other comprehensive income - Reclassified Amounts (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Unrealized appreciation of investments, net [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications before income taxes	$ (299)	$ (1,235)
Applicable income taxes	(63)	(432)
Total reclassifications into net earnings	(236)	(803)
Prior service and actuarial gains/losses of defined benefit pension plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications before income taxes	101	82
Applicable income taxes	25	21
Total reclassifications into net earnings	76	61
Other AOCI transactions [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications before income taxes	10	32
Applicable income taxes	3	14
Total reclassifications into net earnings	7	18
Accumulated other comprehensive income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications before income taxes	(188)	(1,121)
Applicable income taxes	(35)	(397)
Total reclassifications into net earnings	$ (153)	$ (724)

XML

Contingencies and Subsequent Event - Narrative (Detail) - MLMIC Insurance Company [Member] - USD ($) $ in Millions		9 Months Ended
	Oct. 01, 2018	Sep. 30, 2018
Subsequent Event [Line Items]
Premiums earned		$ 300
NICO [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Acquisition price	$ 2,500
Assets	6,300
Liabilities	$ 3,800

XML

Business segment data - Revenues by segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Total revenues	$ 63,450	$ 59,507	$ 184,123	$ 181,133
BNSF [Member]
Segment Reporting Information [Line Items]
Total revenues	6,112		17,547
Berkshire Hathaway Energy [Member]
Segment Reporting Information [Line Items]
Total revenues	5,706		15,268
Manufacturing Businesses [Member]
Segment Reporting Information [Line Items]
Total revenues	13,529		40,281
McLane Company [Member]
Segment Reporting Information [Line Items]
Total revenues	12,822		37,438
Service and Retailing Businesses [Member]
Segment Reporting Information [Line Items]
Total revenues	6,955		20,552
Finance and Financial Products Reportable Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	2,431		6,857
Operating Businesses [Member]
Segment Reporting Information [Line Items]
Total revenues	63,412	59,559	184,091	181,389
Operating Businesses [Member] | Insurance Group [Member]
Segment Reporting Information [Line Items]
Interest, dividend and other investment income	1,446	1,248	4,058	3,664
Total revenues	15,779	14,597	45,913	51,133
Operating Businesses [Member] | Insurance Group [Member] | GEICO [Member]
Segment Reporting Information [Line Items]
Premiums earned	8,506	7,543	24,705	21,632
Operating Businesses [Member] | Insurance Group [Member] | Berkshire Hathaway Reinsurance Group [Member]
Segment Reporting Information [Line Items]
Premiums earned	3,777	3,954	11,229	20,550
Operating Businesses [Member] | Insurance Group [Member] | Berkshire Hathaway Primary Group [Member]
Segment Reporting Information [Line Items]
Premiums earned	2,050	1,852	5,921	5,287
Operating Businesses [Member] | BNSF [Member]
Segment Reporting Information [Line Items]
Total revenues	6,147	5,314	17,649	15,749
Operating Businesses [Member] | Berkshire Hathaway Energy [Member]
Segment Reporting Information [Line Items]
Total revenues	5,706	5,351	15,268	14,184
Operating Businesses [Member] | Manufacturing Businesses [Member]
Segment Reporting Information [Line Items]
Total revenues	13,552	12,819	40,339	37,654
Operating Businesses [Member] | McLane Company [Member]
Segment Reporting Information [Line Items]
Total revenues	12,822	12,798	37,438	37,480
Operating Businesses [Member] | Service and Retailing Businesses [Member]
Segment Reporting Information [Line Items]
Total revenues	6,974	6,527	20,623	19,170
Operating Businesses [Member] | Finance and Financial Products Reportable Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	2,432	2,153	6,861	6,019
Corporate, Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 38	$ (52)	$ 32	$ (256)

XML

Business segment data - Earnings before income taxes by segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Investment and derivative contract gains/losses	$ 14,706	$ 965	$ 13,053	$ 1,965
Earnings before income taxes	23,147	5,630	36,722	17,447
Operating Businesses [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	8,312	5,024	23,260	16,626
Operating Businesses [Member] | Insurance Group [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	2,054	(963)	6,373	1,046
Operating Businesses [Member] | Insurance Group [Member] | Interest, Dividend and Other Investment Income [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	1,455	1,246	4,052	3,658
Operating Businesses [Member] | Insurance Group [Member] | GEICO [Member] | Insurance Premiums Earned [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	627	(416)	1,977	(122)
Operating Businesses [Member] | Insurance Group [Member] | Berkshire Hathaway Reinsurance Group [Member] | Insurance Premiums Earned [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	(163)	(1,845)	(124)	(2,963)
Operating Businesses [Member] | Insurance Group [Member] | Berkshire Hathaway Primary Group [Member] | Insurance Premiums Earned [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	135	52	468	473
Operating Businesses [Member] | BNSF [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	1,879	1,710	5,047	4,592
Operating Businesses [Member] | Berkshire Hathaway Energy [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	1,165	1,243	2,238	2,481
Operating Businesses [Member] | Manufacturing Businesses [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	2,012	2,002	6,002	5,428
Operating Businesses [Member] | McLane Company [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	44	45	171	202
Operating Businesses [Member] | Service and Retailing Businesses [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	628	491	1,840	1,439
Operating Businesses [Member] | Finance and Financial Products Reportable Segment [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	530	496	1,589	1,438
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Investment and derivative contract gains/losses	14,706	965	13,053	1,965
Interest expense	(60)	(386)	(77)	(1,243)
Equity method investments	316	305	1,044	932
Corporate, Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Earnings before income taxes from operating businesses	$ (127)	$ (278)	$ (558)	$ (833)