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Asset Retirement Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Asset Retirement Obligations, Noncurrent [Abstract]    
Carrying Amount at Beginning of Period $ 1,217 $ 1,111
Liabilities Incurred 81 58
Liabilities Settled (1) [1] (131) (54)
Accretion 44 47
Revisions 20 54
Foreign Currency Translations 0 1
Carrying Amount at End of Period 1,231 1,217
Current Portion 43 50
Noncurrent Portion $ 1,188 $ 1,167
[1] Includes settlements related to asset sales and property exchanges.