Charges and Credits - Summary of Charges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Investment In Joint Venture [Line Items]
Charges, Pretax	$ 664	$ 572
Charges, Tax		19
Charges, Net		(591)
Gain on formation of OneSubsea joint venture | Gain on formation of OneSubsea
Investment In Joint Venture [Line Items]
Charges, Pretax		1,028
Charges, Net		(1,028)
Impairment of equity-method investments | Impairment And other
Investment In Joint Venture [Line Items]
Charges, Pretax		(364)
Charges, Tax		19
Charges, Net		345
Currency devaluation loss in Venezuela | Impairment And other
Investment In Joint Venture [Line Items]
Charges, Pretax		(92)
Charges, Net		$ 92