Charges and Credits - Summary of Charges and Credits (Detail) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2018
Charges And Credits [Line Items]
Charges and credits, Pretax					$ 12,901			$ 141
Charges and credits, Tax					710			17
Charges and credits, Net					12,191			124
Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax							$ 12,515
Charges and credits, Tax							1,041
Charges and credits, Net							$ 11,474
Goodwill | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax				$ 3,070
Charges and credits, Net				3,070
Intangible assets impairment | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax				3,321		$ 1,085
Charges and credits, Tax				815		248
Charges and credits, Net				2,506		837
Asset Performance Solutions Investments | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax			$ 730	1,264
Charges and credits, Tax			15	(4)
Charges and credits, Net			715	1,268
Multiclient seismic data impairment | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax			156
Charges and credits, Tax			2
Charges and credits, Net			154
North America pressure pumping asset impairments | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax				587		1,575
Charges and credits, Tax				133		344
Charges and credits, Net				454		1,231
Workforce reductions
Charges And Credits [Line Items]
Charges and credits, Pretax								184
Charges and credits, Tax								20
Charges and credits, Net								164
Workforce reductions | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		$ 63	1,021	202	68
Charges and credits, Tax			71	7	8
Charges and credits, Net		63	950	195	60
Other | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	$ 62	33	60	79		242
Charges and credits, Tax	4	1	4	9		13
Charges and credits, Net	58	32	56	70		229
Valuation allowance | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Tax				(164)
Charges and credits, Net				$ 164
Fixed Asset Impairment | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax			666
Charges and credits, Tax			52
Charges and credits, Net			614
Inventory Write Down | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax			603
Charges and credits, Tax			49
Charges and credits, Net			554
Right Of Use Asset Impairments | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax			311
Charges and credits, Tax			67
Charges and credits, Net			244
Costs Associated With Exiting Certain Activities1 | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax			205
Charges and credits, Tax			(25)
Charges and credits, Net			230
Repurchase of bonds | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax			40		22
Charges and credits, Tax			2		5
Charges and credits, Net			38		17
Postretirement Benefits Curtailment Gain | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax			(69)
Charges and credits, Tax			(16)
Charges and credits, Net			$ (53)
Facility exit charges | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		254
Charges and credits, Tax		39
Charges and credits, Net		$ 215
Gain on sale of OneStim | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	(104)
Charges and credits, Tax	(11)
Charges and credits, Net	(93)
Unrealized Gain On Available For Sale Marketable Securities | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	(39)
Charges and credits, Tax	(9)
Charges and credits, Net	$ (30)
North America restructuring | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax					225
Charges and credits, Tax					51
Charges and credits, Net					174
Other restructuring | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax					104
Charges and credits, Tax					(33)
Charges and credits, Net					137
Other North America - Related | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax						310
Charges and credits, Tax						53
Charges and credits, Net						257
Argentina | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax						127
Charges and credits, Net						127
Pension settlement accounting | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax					37
Charges and credits, Tax					8
Charges and credits, Net					29
Equity Method Investment, Other Than Temporary Impairment | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax						231
Charges and credits, Tax						12
Charges and credits, Net						219
Gain on formation of Sensia joint venture | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax					(247)
Charges and credits, Tax					(42)
Charges and credits, Net					$ (205)
Asset Performance Solutions | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax						294
Charges and credits, Net						294
Goodwill impairment | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax						8,828
Charges and credits, Tax						43
Charges and credits, Net						$ 8,785
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 Impairment Charges
Charges And Credits [Line Items]
Charges and credits, Pretax								172
Charges and credits, Tax								16
Charges and credits, Net								$ 156