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Derivative and Hedging Activities - Oil, Natural Gas and NGL Revenues (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended
Feb. 09, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative [Line Items]          
Total revenues and other $ 260 $ 890 $ 960 $ 2,463 $ 3,992
Not designated as hedging instrument | Oil, natural gas and NGL sales          
Derivative [Line Items]          
Losses on terminated cash flow hedges (3) 0 (7) 0 (24)
Total revenues and other (382) (910) (161) (1,604) 573
Not designated as hedging instrument | Oil, natural gas and NGL sales | Commodity contract          
Derivative [Line Items]          
Gains (losses) on undesignated oil and natural gas derivatives $ (379) $ (910) $ (154) $ (1,604) $ 597