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Asset Retirement Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Company Before Tax Obligation      
Balance at January 1 $ 12,808 $ 13,616 $ 12,832
Liabilities assumed in the Noble acquisition 0 0 630
Liabilities incurred 9 31 10
Liabilities settled (1,281) (1,887) (1,661)
Accretion expense 560 616 560
Revisions in estimated cash flows 605 432 1,245
Balance at December 31 12,701 $ 12,808 $ 13,616
Long-term portion of the company's before-tax asset retirement obligations $ 11,419