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Revenue - Schedule of Revenue Disaggregated by Major Product (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenue $ 1,944 $ 1,833 $ 5,352 $ 5,663
Petroleum Segment        
Disaggregation of Revenue [Line Items]        
Total revenue 1,736 1,645 4,769 5,155
Renewables Segment        
Disaggregation of Revenue [Line Items]        
Total revenue 44 64 109 123
Nitrogen Fertilizer Segment        
Disaggregation of Revenue [Line Items]        
Total revenue 164 124 474 385
Operating Segments | Petroleum Segment        
Disaggregation of Revenue [Line Items]        
Other revenue 57 39 141 131
Total revenue 1,739 1,648 4,777 5,165
Operating Segments | Petroleum Segment | Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue 856 882 2,283 2,713
Operating Segments | Petroleum Segment | Distillates        
Disaggregation of Revenue [Line Items]        
Revenue 794 698 1,984 2,200
Operating Segments | Petroleum Segment | Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue 29 26 361 111
Operating Segments | Renewables Segment        
Disaggregation of Revenue [Line Items]        
Total revenue 99 99 240 196
Operating Segments | Renewables Segment | Renewable diesel        
Disaggregation of Revenue [Line Items]        
Revenue 39 37 92 73
Operating Segments | Renewables Segment | Renewable fuel credits        
Disaggregation of Revenue [Line Items]        
Revenue 5 27 17 50
Operating Segments | Nitrogen Fertilizer Segment        
Disaggregation of Revenue [Line Items]        
Other revenue 15 14 42 38
Total revenue 164 125 475 386
Operating Segments | Nitrogen Fertilizer Segment | Ammonia        
Disaggregation of Revenue [Line Items]        
Revenue 25 25 93 84
Operating Segments | Nitrogen Fertilizer Segment | UAN        
Disaggregation of Revenue [Line Items]        
Revenue 114 77 310 241
Operating Segments | Nitrogen Fertilizer Segment | Urea Products        
Disaggregation of Revenue [Line Items]        
Revenue $ 10 $ 8 $ 29 $ 22