This element represents the additional payments, which are committed to be paid on account of joint venture.

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Namespace Prefix:	cat
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the book value of the outside shareholder's noncontrolling interest in the newly consolidated subsidiary.

+ Details

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Namespace Prefix:	cat
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The element represents the working capital adjustment to the cash paid at the closing of the acquisition.

+ Details

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Namespace Prefix:	cat
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Additional cash payment to acquire and entity to be made in the future.

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Namespace Prefix:	cat
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of post-closing adjustments paid in a business acquisition.

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Namespace Prefix:	cat
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of acquisition cost of a business combination allocated to accounts payable.

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Namespace Prefix:	cat
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The amount of acquisition cost of a business combination allocated to accrued expenses.

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Namespace Prefix:	cat
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- Definition

The debt assumed as part of the purchase price, which is included among the aggregate liabilities assumed.

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Namespace Prefix:	cat
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Balance Type:	credit
Period Type:	instant

- Definition

This element represents the deferred tax liabilities recognized in a business combination.

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Namespace Prefix:	cat
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of acquisition cost of a business combination allocated to tangible assets.

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Namespace Prefix:	cat
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Period Type:	instant

- Definition

The amount of acquisition cost of a business combination allocated to net tangible assets and liabilities.

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Data Type:	xbrli:monetaryItemType
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- Definition

The increase in the entity's assets due to the consolidation of a subsidiary that had formerly been an equity method investment.

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Period Type:	instant

- Definition

The increase in the entity's debt due to the consolidation of a subsidiary that had formerly been an equity method investment.

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Namespace Prefix:	cat
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The increase in the entity's goodwill and intangibles due to the consolidation of a subsidiary that had formerly been an equity method investment.

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Period Type:	instant

- Definition

The increase in the entity's inventory due to the consolidation of a subsidiary that had formerly been an equity method investment.

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Period Type:	instant

- Definition

The increase in the entity's net liabilities due to the consolidation of a subsidiary that had formerly been an equity method investment.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The increase in the entity's property, plant and equipment due to the consolidation of a subsidiary that had formerly been an equity method investment.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

The increase in the entity's receivables due to the consolidation of a subsidiary that had formerly been an equity method investment.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The reduction in the entity's investment in affiliates due to the consolidation of a subsidiary that had formerly been an equity method investment.

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Namespace Prefix:	cat
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Period Type:	instant

- Definition

The decrease in retained earnings due to the adjustment to increase the carrying value of redeemable noncontrolling interest to the redemption value upon the consolidation of a subsidiary that had formerly been an equity method investment.

+ Details

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Namespace Prefix:	cat
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- Definition

The amount of inventory that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the price paid by the new subsidiary to redeem a portion of its shares held by a stockholder other than the entity.

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Namespace Prefix:	cat
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the additional equity method ownership percentage attributable to the entity following the redemption.

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Namespace Prefix:	cat
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the period, in years, for required funding of the joint venture.

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Namespace Prefix:	cat
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the equity method investee cumulative percentage ownership before all transactions took place.

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Data Type:	us-types:percentItemType
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Period Type:	instant

- Definition

The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 44
-Subparagraph a(1)

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

The aggregate cost of a major indefinite-lived intangible asset class acquired, during the period, either individually or as part of a group of assets (in either an asset acquisition or business combination).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 44
-Subparagraph b

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of cash paid to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of voting equity interests acquired in the business combination.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph c

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Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of acquisition cost of a business combination allocated to assets acquired.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 37
-Subparagraph g

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of acquisition cost of a business combination allocated to inventory, including finished goods, work-in-process, and raw materials.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 51
-Subparagraph e

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 37
-Subparagraph c

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of acquisition cost of a business combination allocated to receivables.

+ References

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 52
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph k

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of acquisition cost of a business combination allocated to liabilities assumed.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 37
-Subparagraph g

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 98-1

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Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

+ References

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Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The useful life of all finite-lived intangible assets. This may be stated as a fixed number (for example, 10 years) if all assets have the same useful life, or it can be stated in a range (for example, six to eight years) if there is a range of useful lives in the asset group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 12, 13, 14

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Namespace Prefix:	us-gaap
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The calculated weighted-average useful life of all finite-lived intangible assets.

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Data Type:	xbrli:integerItemType
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Period Type:	duration

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Publisher FASB
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-Publisher FASB
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 20

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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- Definition

The consolidating entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 17
-Subparagraph b

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- Definition

The aggregate amount to be paid by the entity upon redemption of the security that is classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 28
-Subparagraph b
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 00-19
-Paragraph 12

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Business combinations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended				12 Months Ended		1 Months Ended					1 Months Ended		1 Months Ended			1 Months Ended		1 Months Ended			1 Months Ended	3 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Aug. 02, 2008	Dec. 31, 2010 NC2 Joint Venture	Dec. 31, 2009 NC2 Joint Venture	Apr. 30, 2008 Lovat Inc.	Dec. 31, 2008 Lovat Inc.	Dec. 31, 2008 Gremada Industries Inc.	Aug. 31, 2008 Gremada Industries Inc.	Jul. 31, 2008 Gremada Industries Inc.	Aug. 30, 2008 Shin Caterpillar Mitsubishi Ltd. (SCM)	Aug. 02, 2008 Shin Caterpillar Mitsubishi Ltd. (SCM)	May 31, 2010 FCM Rail Ltd.	Dec. 31, 2010 FCM Rail Ltd.	Oct. 31, 2010 FCM Rail Ltd.	Mar. 31, 2010 GE Transportation's Inspection Products Business	Dec. 31, 2010 GE Transportation's Inspection Products Business	Mar. 31, 2010 JCS Company, Ltd.	Dec. 31, 2010 JCS Company, Ltd.	Jun. 30, 2010 JCS Company, Ltd.	Aug. 31, 2010 Electro-Motive Diesel	Dec. 31, 2010 Electro-Motive Diesel	Dec. 31, 2010 Electro-Motive Diesel In-process research and development	Aug. 31, 2010 Electro-Motive Diesel In-process research and development
Business Acquisition
Contribution to joint venture					$ 80	$ 19
Additional payments for joint venture committed to be paid						40
Required funding period of the joint venture (in years)						3
Percentage of equity acquired (as a percent)							100.00%							100.00%					100.00%			100.00%
Cost of acquired entity, purchase price							49				62			97			46		34			901
Liabilities assumed														82			9		8			518
Net tangible assets acquired and liabilities assumed							10				21
Finite-lived intangible assets acquired	409						17	17					54	10	10		28	28	12	12		329	329
Amortization period of finite-lived intangible assets obtained through acquisition (in years)							6					9		15			13		9			15
Goodwill acquired in business combination							22	22	41				206	17	17		15	15	8	8		286	286
Goodwill acquired in business combination, tax deductible											41						8
Cost of acquisition paid in cash											60			32					32			928
Final net working capital adjustment																							27
Cost of acquisition, post-closing adjustment paid										2						1	1				2
Cat Japan, consolidated subsidiary, Caterpillar majority percentage ownership (as a percent)				67.00%									67.00%
Cat Japan, consolidated subsidiary, MHI minority percentage ownership (as a percent)				33.00%									33.00%
Equity method investee ownership percentage before all transactions (as a percent)													50.00%
Price SCM paid in redemption of half of MHI's shares												464
Redemption, increase in entity's ownership interest (as a percent)												17.00%
Increase in property, plant and equipment following redemption													78
Increase in inventory following redemption													8
Inventory acquired																						549
Weighted Amortizable Life (Years)	14	15	15
Deferred tax liabilities acquired													57									104
Consolidation of Cat Japan, increase in assets													2,396
Consolidation of Cat Japan, increase in property, plant and equipment													1,279
Consolidation of Cat Japan, increase in inventory													640
Consolidation of Cat Japan, increase in receivables													612
Consolidation of Cat Japan, increase in goodwill and intangibles													260
Consolidation of Cat Japan, reduction in investment in affiliates													528
Consolidation of Cat Japan, net increase in liabilities													2,045
Consolidation of Cat Japan, increase in debt													1,388
Redeemable noncontrolling interest (Note 24)	461	477	524										464
Book value of the 33 percent noncontrolling interest													351
Consolidation of Cat Japan, reduction of Profit employed in the business													113
Impairment of goodwill		22
Debt assumed														59
Additional amount to be paid by May 2012.														5
Receivables acquired																						186
Property, plant and equipment acquired																						131
Tangible assets acquired in business combination														93			12		22			890
Accounts payable assumed																						124
Accrued expenses assumed																						161
Indefinite-lived intangible assets acquired in business combinations																								$ 18	$ 18