Charges and Credits - Summary of Charges and Credits (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Charges And Credits [Line Items]
Charges and credits, Pretax	$ 8,523,000,000
Charges and credits, Tax	(796,000,000)
Charges and credits, Net	7,727,000,000	$ 0
Goodwill | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	3,070,000,000
Charges and credits, Net	3,070,000,000
Intangible Assets | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	3,321,000,000
Charges and credits, Tax	(815,000,000)
Charges and credits, Net	2,506,000,000
APS investments | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	1,264,000,000
Charges and credits, Tax	4,000,000
Charges and credits, Net	1,268,000,000
North America pressure pumping asset impairments | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	587,000,000
Charges and credits, Tax	(133,000,000)
Charges and credits, Net	454,000,000
Severance | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	202,000,000
Charges and credits, Tax	(7,000,000)
Charges and credits, Net	195,000,000
Other | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax	79,000,000
Charges and credits, Tax	(9,000,000)
Charges and credits, Net	70,000,000
Valuation allowance | Impairment and Other
Charges And Credits [Line Items]
Charges and credits, Tax	164,000,000
Charges and credits, Net	$ 164,000,000