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Summary of Significant Accounting Policies - Identified Intangible Assets Identified by Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Intangible Asset Excluding Goodwill [Line Items]
Beginning Balance	$ 4,073	$ 4,103
Additions to intangible assets	981	273
Amortization	(305)	(276)
Currency translation adjustments and other	(6)	(27)
Ending Balance	4,743	4,073
Rig Technology [Member]
Intangible Asset Excluding Goodwill [Line Items]
Beginning Balance	654	666
Additions to intangible assets	545	70
Amortization	(76)	(60)
Currency translation adjustments and other	(11)	(22)
Ending Balance	1,112	654
Petroleum Services & Supplies [Member]
Intangible Asset Excluding Goodwill [Line Items]
Beginning Balance	3,391	3,432
Additions to intangible assets	380	176
Amortization	(224)	(213)
Currency translation adjustments and other	3	(4)
Ending Balance	3,550	3,391
Distribution & Transmission [Member]
Intangible Asset Excluding Goodwill [Line Items]
Beginning Balance	28	5
Additions to intangible assets	56	27
Amortization	(5)	(3)
Currency translation adjustments and other	2	(1)
Ending Balance	$ 81	$ 28

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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