Charges and Credits - Summary of Charges (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investment In Joint Venture [Line Items]
Charges, Pretax	$ 1,773		$ 161
Charges, Tax	134		22
Charges, Net	1,639		139
Charges and credits, Pretax	1,773	(420)	161
Charges and credits, Tax		49
Charges and credits, Net		(469)
WesternGeco restructuring | Impairment And Other
Investment In Joint Venture [Line Items]
Charges, Pretax	806
Charges, Tax	25
Charges, Net	781
Currency devaluation loss in Venezuela | Impairment And Other
Investment In Joint Venture [Line Items]
Charges, Pretax	472
Charges, Net	472
Charges and credits, Pretax		92
Charges and credits, Net		92
Severance and other | Impairment And Other
Investment In Joint Venture [Line Items]
Charges, Pretax	296		33
Charges, Tax	37		6
Charges, Net	259		27
Impairment of SPM project | Impairment And Other
Investment In Joint Venture [Line Items]
Charges, Pretax	199
Charges, Tax	72
Charges, Net	127
Gain On Formation Of One Subsea Joint Venture | Gain On Formation Of One Subsea
Investment In Joint Venture [Line Items]
Charges and credits, Pretax		(1,028)
Charges and credits, Net		(1,028)
Impairment Of Equity Method Investments | Impairment And Other
Investment In Joint Venture [Line Items]
Charges and credits, Pretax		364
Charges and credits, Tax		19
Charges and credits, Net		345
Cost Of Revenue | Provision For Accounts Receivable
Investment In Joint Venture [Line Items]
Charges and credits, Pretax		152
Charges and credits, Tax		30
Charges and credits, Net		122
Merger-related integration costs | Merger And Integration
Investment In Joint Venture [Line Items]
Charges, Pretax			128
Charges, Tax			16
Charges, Net			$ 112