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Commitments and Contingencies - RFS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Petroleum Segment | Environmental, Health, and Safety Matters        
Loss Contingencies [Line Items]        
Expense (benefit) recognized for compliance with RFS $ 36 $ (2) $ 71 $ 31