Charges and Credits - Summary of Charges and Credits (Detail) - USD ($)	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020
Charges And Credits [Line Items]
Charges and credits, Pretax				$ 12,692,000,000
Charges and credits, Tax				(713,000,000)
Charges and credits, Net				11,979,000,000	$ 0
Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		$ 40,000,000	$ 3,321,000,000			$ 12,596,000,000
Charges and credits, Tax		(2,000,000)	(815,000,000)			(1,057,000,000)
Charges and credits, Net		38,000,000	2,506,000,000			$ 11,539,000,000
Goodwill | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax			3,070,000,000	8,828,000,000
Charges and credits, Tax				(43,000,000)
Charges and credits, Net			3,070,000,000	8,785,000,000
Asset Performance Solutions Investments | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		730,000,000	1,264,000,000	294,000,000
Charges and credits, Tax		(15,000,000)	4,000,000
Charges and credits, Net		715,000,000	1,268,000,000	294,000,000
North America pressure pumping asset impairments | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax			587,000,000	1,575,000,000
Charges and credits, Tax			(133,000,000)	(344,000,000)
Charges and credits, Net			454,000,000	1,231,000,000
Workforce reductions | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	$ 63,000,000	1,021,000,000	202,000,000
Charges and credits, Tax		(71,000,000)	(7,000,000)
Charges and credits, Net	63,000,000	950,000,000	195,000,000
Other | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	33,000,000	60,000,000	79,000,000	242,000,000
Charges and credits, Tax	(1,000,000)	(4,000,000)	(9,000,000)	(13,000,000)
Charges and credits, Net	32,000,000	56,000,000	70,000,000	229,000,000
Valuation allowance | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Tax			164,000,000
Charges and credits, Net			$ 164,000,000
Fixed Asset Impairments | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		666,000,000
Charges and credits, Tax		(52,000,000)
Charges and credits, Net		614,000,000
Inventory Write Down | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		603,000,000
Charges and credits, Tax		(49,000,000)
Charges and credits, Net		554,000,000
Right-of-use Asset Impairments | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		311,000,000
Charges and credits, Tax		(67,000,000)
Charges and credits, Net		244,000,000
Costs Associated With Exiting Certain Activities | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		205,000,000
Charges and credits, Tax		25,000,000
Charges and credits, Net		230,000,000
Multiclient Seismic Data Impairment | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		156,000,000
Charges and credits, Tax		(2,000,000)
Charges and credits, Net		154,000,000
Postretirement Benefits Curtailment Gain | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		(69,000,000)
Charges and credits, Tax		16,000,000
Charges and credits, Net		$ (53,000,000)
Facility exit charges | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	254,000,000
Charges and credits, Tax	(39,000,000)
Charges and credits, Net	$ 215,000,000
Intangible Assets | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax				1,085,000,000
Charges and credits, Tax				(248,000,000)
Charges and credits, Net				837,000,000
Other North America - Related | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax				310,000,000
Charges and credits, Tax				(53,000,000)
Charges and credits, Net				257,000,000
Argentina | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax				127,000,000
Charges and credits, Net				127,000,000
Equity Method Investment, Other Than Temporary Impairment | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax				231,000,000
Charges and credits, Tax				(12,000,000)
Charges and credits, Net				$ 219,000,000