Charges and Credits - Summary of Charges (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investment In Joint Venture [Line Items]
Charges and credits, Pretax			$ (420)
Charges and credits, Tax			49
Charges and credits, Net			(469)
Currency Devaluation Loss In Venezuela
Investment In Joint Venture [Line Items]
Charges and credits, Pretax			92
Charges and credits, Net			92
Gain On Formation Of OneSubsea Joint Venture
Investment In Joint Venture [Line Items]
Charges and credits, Pretax			(1,028)
Charges and credits, Net			(1,028)
Impairment Of Equity Method Investments
Investment In Joint Venture [Line Items]
Charges and credits, Pretax			364
Charges and credits, Tax			19
Charges and credits, Net			345
Impairment And Other
Investment In Joint Venture [Line Items]
Charges and credits, Pretax	$ 2,575	$ 1,773
Charges and credits, Tax	357	134
Charges and credits, Net	2,218	1,639
Impairment And Other | Workforce reduction
Investment In Joint Venture [Line Items]
Charges and credits, Pretax	920	296
Charges and credits, Tax	107	37
Charges and credits, Net	813	259
Impairment And Other | Fixed asset impairments
Investment In Joint Venture [Line Items]
Charges and credits, Pretax	776
Charges and credits, Tax	141
Charges and credits, Net	635
Impairment And Other | Inventory Write Down
Investment In Joint Venture [Line Items]
Charges and credits, Pretax	269
Charges and credits, Tax	27
Charges and credits, Net	242
Impairment And Other | Impairment of SPM Project
Investment In Joint Venture [Line Items]
Charges and credits, Pretax	182	199
Charges and credits, Tax	36	72
Charges and credits, Net	146	127
Impairment And Other | Facility closures
Investment In Joint Venture [Line Items]
Charges and credits, Pretax	177
Charges and credits, Tax	37
Charges and credits, Net	140
Impairment And Other | Geopolitical Events
Investment In Joint Venture [Line Items]
Charges and credits, Pretax	77
Charges and credits, Net	77
Impairment And Other | Currency Devaluation Loss In Venezuela
Investment In Joint Venture [Line Items]
Charges and credits, Pretax	49	472
Charges and credits, Net	49	472
Impairment And Other | Contract termination costs
Investment In Joint Venture [Line Items]
Charges and credits, Pretax	41
Charges and credits, Tax	2
Charges and credits, Net	39
Impairment And Other | Other Restructuring
Investment In Joint Venture [Line Items]
Charges and credits, Pretax	84
Charges and credits, Tax	7
Charges and credits, Net	$ 77
Impairment And Other | WesternGeco restructuring
Investment In Joint Venture [Line Items]
Charges and credits, Pretax		806
Charges and credits, Tax		25
Charges and credits, Net		$ 781
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