Charges and Credits - Summary of Charges and Credits (Detail) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Apr. 02, 2016	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Charges And Credits [Line Items]
Charges and credits, Pretax		$ 1,025	$ 50		$ 3,764	$ 3,820
Charges and credits, Tax					140	583
Charges and credits, Noncontolling interests					34
Charges and credits, Net					3,590	3,237
Gain on sale of marine seismic acquisition business
Charges And Credits [Line Items]
Charges and credits, Pretax				$ (215)
Charges and credits, Tax				(19)
Charges and credits, Net				(196)
Asset impairments
Charges And Credits [Line Items]
Charges and credits, Pretax				172
Charges and credits, Tax				16
Charges and credits, Net				156
Workforce reduction
Charges And Credits [Line Items]
Charges and credits, Pretax		247		184
Charges and credits, Tax				20
Charges and credits, Net				$ 164
Other restructuring charges
Charges And Credits [Line Items]
Charges and credits, Pretax		102
Provision for loss on long-term construction project
Charges And Credits [Line Items]
Charges and credits, Pretax		245
Inventory write-downs
Charges And Credits [Line Items]
Charges and credits, Pretax		$ 59
Impairment And Other | WesternGeco seismic restructuring charges
Charges And Credits [Line Items]
Charges and credits, Pretax					1,114
Charges and credits, Tax					20
Charges and credits, Net					1,094
Impairment And Other | Venezuela investment write-down
Charges And Credits [Line Items]
Charges and credits, Pretax					938
Charges and credits, Net					938
Impairment And Other | Workforce reduction
Charges And Credits [Line Items]
Charges and credits, Pretax					247	880
Charges and credits, Tax					13	69
Charges and credits, Net					234	811
Impairment And Other | Multiclient seismic data impairment
Charges And Credits [Line Items]
Charges and credits, Pretax					246	198
Charges and credits, Tax					81	62
Charges and credits, Net					165	136
Impairment And Other | Other restructuring charges
Charges And Credits [Line Items]
Charges and credits, Pretax					156	55
Charges and credits, Tax					10
Charges and credits, Noncontolling interests					22
Charges and credits, Net					124	55
Impairment And Other | Other fixed asset impairments
Charges And Credits [Line Items]
Charges and credits, Pretax						684
Charges and credits, Tax						52
Charges and credits, Net						632
Impairment And Other | North America pressure pumping asset impairments
Charges And Credits [Line Items]
Charges and credits, Pretax						209
Charges and credits, Tax						67
Charges and credits, Net						142
Impairment And Other | Facilities impairments
Charges And Credits [Line Items]
Charges and credits, Pretax						165
Charges and credits, Tax						58
Charges and credits, Net						107
Impairment And Other | Facility closure costs
Charges And Credits [Line Items]
Charges and credits, Pretax						165
Charges and credits, Tax						40
Charges and credits, Net						125
Impairment And Other | Costs associated with exiting certain activities
Charges And Credits [Line Items]
Charges and credits, Pretax						98
Charges and credits, Tax						23
Charges and credits, Net						75
Impairment And Other | Currency Devaluation Loss In Egypt
Charges And Credits [Line Items]
Charges and credits, Pretax						63
Charges and credits, Net						63
Impairment And Other | Contract termination costs
Charges And Credits [Line Items]
Charges and credits, Pretax						39
Charges and credits, Tax						9
Charges and credits, Net						30
Impairment And Other | Inventory write-downs
Charges And Credits [Line Items]
Charges and credits, Pretax						616
Charges and credits, Tax						49
Charges and credits, Net						567
Promissory Note Fair Value Adjustment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax			$ 460		510
Charges and credits, Noncontolling interests					12
Charges and credits, Net					498
Cost of Sales
Charges And Credits [Line Items]
Charges and credits, Pretax					245	299
Cost of Sales | Amortization of inventory fair value adjustment
Charges And Credits [Line Items]
Charges and credits, Pretax						299
Charges and credits, Tax						90
Charges and credits, Net						209
Cost of Sales | Provision for loss on long-term construction project
Charges And Credits [Line Items]
Charges and credits, Pretax					245
Charges and credits, Tax					22
Charges and credits, Net					223
Merger and Integration
Charges And Credits [Line Items]
Charges and credits, Pretax	$ 349				308	349
Merger and Integration | Facility closure costs
Charges And Credits [Line Items]
Charges and credits, Pretax						61
Charges and credits, Tax						13
Charges and credits, Net						48
Merger and Integration | Merger and integration-related costs
Charges And Credits [Line Items]
Charges and credits, Pretax					308
Charges and credits, Tax					70
Charges and credits, Net					238
Merger and Integration | Other merger and integration-related
Charges And Credits [Line Items]
Charges and credits, Pretax						160
Charges and credits, Tax						28
Charges and credits, Net						132
Merger and Integration | Merger-related employee benefits
Charges And Credits [Line Items]
Charges and credits, Pretax						83
Charges and credits, Tax						13
Charges and credits, Net						70
Merger and Integration | Professional fees
Charges And Credits [Line Items]
Charges and credits, Pretax						45
Charges and credits, Tax						10
Charges and credits, Net						$ 35
US tax reform charge
Charges And Credits [Line Items]
Charges and credits, Tax					(76)
Charges and credits, Net					$ 76