Consolidated Balance Sheets £ in Millions, $ in Millions, € in Billions, ¥ in Billions		Sep. 30, 2021 USD ($)		Dec. 31, 2020 USD ($)
ASSETS
Investments in fixed maturity securities		$ 18,125		$ 20,410
Investments in equity securities		310,739	[1]	281,170	[2]
Loans and finance receivables		20,397		19,201
Inventories		20,191		19,208
Equipment held for lease		14,752		14,601
Goodwill	[3]	73,770		73,734
Deferred charges under retroactive reinsurance contracts		11,732		12,441
Total assets		920,758		873,729
LIABILITIES
Unpaid losses and loss adjustment expenses		85,754		79,854
Unpaid losses and loss adjustment expenses under retroactive reinsurance contracts		39,721		40,966
Income taxes, principally deferred		82,248		74,098
Total liabilities		439,683		422,393
Shareholders’ equity:
Common stock		8		8
Capital in excess of par value		35,603		35,626
Accumulated other comprehensive income		(4,834)		(4,243)
Retained earnings		494,775		444,626
Treasury stock, at cost		(53,072)		(32,853)
Berkshire Hathaway shareholders’ equity		472,480		443,164
Noncontrolling interests		8,595		8,172
Total shareholders’ equity		481,075		451,336
Total liabilities and shareholders' equity		920,758		873,729
Insurance and Other [Member]
ASSETS
Cash and cash equivalents	[4]	65,156		44,714
Short-term investments in U.S. Treasury Bills		79,209		90,300
Investments in fixed maturity securities		18,125		20,410
Investments in equity securities		310,739		281,170
Equity method investments		16,658		17,303
Loans and finance receivables		20,397		19,201
Other receivables		37,277		32,310
Inventories		20,191		19,208
Property, plant and equipment		20,722		21,200
Equipment held for lease		14,752		14,601
Goodwill		47,090		47,121
Other intangible assets		28,643		29,462
Deferred charges under retroactive reinsurance contracts		11,732		12,441
Other		16,301		14,580
Total assets		706,992		664,021
LIABILITIES
Unpaid losses and loss adjustment expenses		85,754		79,854
Unpaid losses and loss adjustment expenses under retroactive reinsurance contracts		39,721		40,966
Unearned premiums		25,239		21,395
Life, annuity and health insurance benefits		22,409		21,616
Other policyholder liabilities		8,863		8,670
Accounts payable, accruals and other liabilities		31,154		29,279
Derivative contract liabilities		286		1,065
Aircraft repurchase liabilities and unearned lease revenues		5,840		5,856
Notes payable and other borrowings		39,645		41,522
Total liabilities		258,911		250,223
Railroad, Utilities and Energy [Member]
ASSETS
Cash and cash equivalents	[4]	4,833		3,276
Receivables		4,324		3,542
Property, plant and equipment		153,401		151,216
Goodwill		26,680		26,613
Regulatory assets		3,842		3,440
Other		20,686		21,621
Total assets		213,766		209,708
LIABILITIES
Accounts payable, accruals and other liabilities		15,978		15,224
Regulatory liabilities		7,226		7,475
Notes payable and other borrowings		75,320		75,373
Total liabilities		$ 98,524		$ 98,072

[1] Approximately 70% of the aggregate fair value was concentrated in four companies (American Express Company – $25.4 billion; Apple Inc. – $128.4 billion; Bank of America Corporation – $43.9 billion and The Coca-Cola Company – $21.0 billion).

[2] Approximately 68% of the aggregate fair value was concentrated in four companies (American Express Company – $18.3 billion; Apple Inc. – $120.4 billion; Bank of America Corporation – $31.3 billion and The Coca-Cola Company – $21.9 billion).

[3] Net of accumulated goodwill impairments of $11.0 billion as of September 30, 2021 and December 31, 2020.

[4] Includes U.S. Treasury Bills with maturities of three months or less when purchased of $37.9 billion at September 30, 2021 and $23.2 billion at December 31, 2020.