Charges and Credits - Summary of Charges and Credits (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021
Charges And Credits [Line Items]
Charges and credits, Pretax			$ 12,247
Charges and credits, Tax			1,017
Charges and credits, Net			$ 11,230
Goodwill | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		$ 3,070
Charges and credits, Net		3,070
Intangible assets | Impairment and Other
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 | 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
North America pressure pumping asset impairments | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		587
Charges and credits, Tax		133
Charges and credits, Net		454
Severance | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	1,021	202
Charges and credits, Tax	71	7
Charges and credits, Net	950	195
Other | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	61	79
Charges and credits, Tax	4	9
Charges and credits, Net	57	70
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
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
Repurchase of bonds | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	40
Charges and credits, Tax	2
Charges and credits, Net	38
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)