Charges and Credits - Summary of Charges and Credits (Detail) - Impairment and Other - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Charges And Credits [Line Items]
Charges and credits, Pretax	$ 12,596
Charges and credits, Tax	1,057
Charges and credits, Net	11,539
Goodwill
Charges And Credits [Line Items]
Charges and credits, Pretax			$ 3,070
Charges and credits, Net			3,070
Intangible assets
Charges And Credits [Line Items]
Charges and credits, Pretax			3,321
Charges and credits, Tax			815
Charges and credits, Net			2,506
Asset Performance Solutions Investments
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
North America pressure pumping asset impairments
Charges And Credits [Line Items]
Charges and credits, Pretax			587
Charges and credits, Tax			133
Charges and credits, Net			454
Severance
Charges And Credits [Line Items]
Charges and credits, Pretax	63	1,021	202
Charges and credits, Tax		71	7
Charges and credits, Net	63	950	195
Other
Charges And Credits [Line Items]
Charges and credits, Pretax	33	60	79
Charges and credits, Tax	1	4	9
Charges and credits, Net	32	56	70
Valuation allowance
Charges And Credits [Line Items]
Charges and credits, Tax			(164)
Charges and credits, Net			$ 164
Fixed Asset Impairment
Charges And Credits [Line Items]
Charges and credits, Pretax		666
Charges and credits, Tax		52
Charges and credits, Net		614
Inventory Write Down
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
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
Charges And Credits [Line Items]
Charges and credits, Pretax		205
Charges and credits, Tax		(25)
Charges and credits, Net		230
Multiclient Seismic Data Impairment
Charges And Credits [Line Items]
Charges and credits, Pretax		156
Charges and credits, Tax		2
Charges and credits, Net		154
Repurchase of Bonds
Charges And Credits [Line Items]
Charges and credits, Pretax		40
Charges and credits, Tax		2
Charges and credits, Net		38
Postretirement Benefits Curtailment Gain
Charges And Credits [Line Items]
Charges and credits, Pretax		(69)
Charges and credits, Tax		(16)
Charges and credits, Net		$ (53)
Facility Exit Charges
Charges And Credits [Line Items]
Charges and credits, Pretax	254
Charges and credits, Tax	39
Charges and credits, Net	$ 215