Charges and Credits - Summary of Charges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012
Investment In Joint Venture [Line Items]
Charges, Pretax	$ (664)	$ 22		$ (572)	$ 37
Charges, Tax	19			19
Charges, Net	(683)	21	13		34
Charges, Net	364			456
Gain on formation of OneSubsea joint venture [Member]
Investment In Joint Venture [Line Items]
Charges, Pretax	(1,028)			(1,028)
Charges, Net	(1,028)
Charges, Net				(1,028)
Impairment of equity-method investments [Member]
Investment In Joint Venture [Line Items]
Charges, Pretax	364			364
Charges, Tax	19			19
Charges, Net				345
Currency devaluation loss In Venezuela [Member]
Investment In Joint Venture [Line Items]
Charges, Pretax				92
Charges, Net				$ 92