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Asset Retirement Obligations (Details)
$ in Millions
9 Months Ended
Sep. 30, 2022
USD ($)
Asset Retirement Obligation Disclosure [Abstract]  
Balance at beginning of year $ 315
Additional liabilities accrued 3
Revisions in estimated cash outflows 12
Disposition of assets (1)
Accretion expense 13
Balance at end of year $ 342