Charges and Credits - Summary of Charges and Credits (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Charges And Credits [Line Items]
Charges and credits, Pretax	$ 8,523
Charges and credits, Tax	796
Charges and credits, Net	7,727
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
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	1,264
Charges and credits, Tax	(4)
Charges and credits, Net	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	202
Charges and credits, Tax	7
Charges and credits, Net	195
Other | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	79
Charges and credits, Tax	9
Charges and credits, Net	70
Valuation allowance | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Tax	(164)
Charges and credits, Net	$ 164