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Revenue - Revenue Disaggregated by Major Product (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenue $ 1,761 $ 1,967 $ 3,407 $ 3,829
Petroleum Segment        
Disaggregation of Revenue [Line Items]        
Total revenue 1,558 1,792 3,033 3,510
Renewables Segment        
Disaggregation of Revenue [Line Items]        
Total revenue 35 42 64 58
Nitrogen Fertilizer Segment        
Disaggregation of Revenue [Line Items]        
Total revenue 168 133 310 261
Operating Segments | Petroleum Segment        
Disaggregation of Revenue [Line Items]        
Other revenue 49 42 84 92
Total revenue 1,561 1,795 3,038 3,517
Operating Segments | Petroleum Segment | Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue 774 944 1,427 1,831
Operating Segments | Petroleum Segment | Distillates        
Disaggregation of Revenue [Line Items]        
Revenue 649 734 1,190 1,502
Operating Segments | Petroleum Segment | Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue 86 72 332 85
Operating Segments | Renewables Segment        
Disaggregation of Revenue [Line Items]        
Total revenue 76 63 142 97
Operating Segments | Renewables Segment | Renewable diesel        
Disaggregation of Revenue [Line Items]        
Revenue 29 26 53 36
Operating Segments | Renewables Segment | Renewable fuel credits        
Disaggregation of Revenue [Line Items]        
Revenue 6 16 11 22
Operating Segments | Nitrogen Fertilizer Segment        
Disaggregation of Revenue [Line Items]        
Other revenue 14 14 28 24
Total revenue 169 133 311 261
Operating Segments | Nitrogen Fertilizer Segment | Ammonia        
Disaggregation of Revenue [Line Items]        
Revenue 34 22 67 59
Operating Segments | Nitrogen Fertilizer Segment | UAN        
Disaggregation of Revenue [Line Items]        
Revenue 110 89 196 164
Operating Segments | Nitrogen Fertilizer Segment | Urea Products        
Disaggregation of Revenue [Line Items]        
Revenue $ 10 $ 8 $ 19 $ 14