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Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Accrued operating and marketing expenditures $ 511 $ 325
Accrued capital expenditures 381 345
Accrued payments to royalty and working interest owners 232 170
Current portion of asset retirement obligations 193 105
Accrued interest on debt 101 126
Accrued compensation and benefits 97 117
Other accruals 63 63
Accrued liabilities $ 1,578 $ 1,251