Impairments and Other Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	[1]	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Impairments and other charges	$ 0		$ 1,073
Drilling And Evaluation [Member]
Restructuring Cost and Reserve [Line Items]
Impairments and other charges			277
Completion And Production [Member]
Restructuring Cost and Reserve [Line Items]
Impairments and other charges			$ 780,000

[1] For the three months ended March 31, 2020, amount includes approximately $780 million attributable to Completion and Production, $277 million attributable to Drilling and Evaluation, and $16 million attributable to Corporate and other.