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Asset Retirement Obligations and Accrued Environmental Costs - Asset Retirement Obligations and Accrued Environmental Costs (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]      
Asset retirement obligations $ 7,227 $ 6,380 $ 5,926
Accrued environmental costs 184 182  
Total asset retirement obligations and accrued environmental costs 7,411 6,562  
Asset retirement obligations and accrued environmental costs due within one year* (191) (161)  
Long-term asset retirement obligations and accrued environmental costs $ 7,220 $ 6,401