Goodwill - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 14,585
Acquisitions	254
Divestiture of business	(150)
Impact of changes in exchange rates	(66)
Goodwill, Ending Balance	14,623
Reservoir Characterization
Goodwill [Line Items]
Goodwill, Beginning Balance	3,760
Acquisitions	4
Divestiture of business
Impact of changes in exchange rates	(24)
Goodwill, Ending Balance	3,740
Drilling
Goodwill [Line Items]
Goodwill, Beginning Balance	8,337
Acquisitions	3
Divestiture of business
Impact of changes in exchange rates	(23)
Goodwill, Ending Balance	8,317
Production
Goodwill [Line Items]
Goodwill, Beginning Balance	2,488
Acquisitions	247
Divestiture of business	(150)
Impact of changes in exchange rates	(19)
Goodwill, Ending Balance	$ 2,566