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Commitments and Contingencies - Renewable Fuel Standard (Details) - Petroleum Segment - Environmental, Health, and Safety Matters - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Loss Contingencies [Line Items]          
Expense (benefit) for compliance with RFS $ 86 $ (135) $ 65 $ (99)  
RFS obligation $ 374   $ 374   $ 329