Goodwill - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 14,585	$ 14,154
Acquisitions	343	484
Reallocation
Divestiture of business	(150)	(76)
Other	(72)	23
Goodwill, Ending Balance	14,706	14,585
Reservoir Characterization
Goodwill [Line Items]
Goodwill, Beginning Balance	3,760	3,360
Acquisitions	4	391
Reallocation
Divestiture of business
Other	(27)	9
Goodwill, Ending Balance	3,737	3,760
Drilling
Goodwill [Line Items]
Goodwill, Beginning Balance	8,337	8,362
Acquisitions	3	93
Reallocation		(125)
Divestiture of business
Other	(25)	7
Goodwill, Ending Balance	8,315	8,337
Production
Goodwill [Line Items]
Goodwill, Beginning Balance	2,488	2,356
Acquisitions	336
Reallocation		125
Divestiture of business	(150)
Other	(20)	7
Goodwill, Ending Balance	2,654	2,488
Distribution
Goodwill [Line Items]
Goodwill, Beginning Balance		76
Acquisitions
Reallocation
Divestiture of business		(76)
Other
Goodwill, Ending Balance