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Commitments and Contingencies - RFS (Details) - Petroleum Segment - Environmental, Health, and Safety Matters - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Loss Contingencies [Line Items]      
Expense (benefit) for compliance with RFS $ 107 $ 178  
RFS obligation $ 585   $ 494