v3.20.2
Impairments - Textual (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]          
Impairments $ 2   $ 24 $ 521 $ 26
Before-tax impairment related to the associated carrying value of capitalized undeveloped leasehold costs 125   360 410 592
Lower 48 [Member]          
Segment Reporting Information [Line Items]          
Impairments $ 1 $ 511 22 $ 514 $ 22
Before-tax impairment related to the associated carrying value of capitalized undeveloped leasehold costs     $ 141    
Asia Pacific [Member]          
Segment Reporting Information [Line Items]          
Before-tax impairment related to the associated carrying value of capitalized undeveloped leasehold costs   $ 31