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Revenue - Revenue Disaggregated by Major Product (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Total revenue $ 1,646 $ 1,863
Petroleum Segment    
Disaggregation of Revenue [Line Items]    
Total revenue 1,475 1,718
Renewables Segment    
Disaggregation of Revenue [Line Items]    
Total revenue 28 17
Nitrogen Fertilizer Segment    
Disaggregation of Revenue [Line Items]    
Total revenue 143 128
Operating Segments | Petroleum Segment    
Disaggregation of Revenue [Line Items]    
Other revenue 35 50
Total revenue 1,477 1,722
Operating Segments | Petroleum Segment | Gasoline    
Disaggregation of Revenue [Line Items]    
Revenue 654 888
Operating Segments | Petroleum Segment | Distillates    
Disaggregation of Revenue [Line Items]    
Revenue 541 767
Operating Segments | Petroleum Segment | Crude oil sales    
Disaggregation of Revenue [Line Items]    
Revenue 245 13
Operating Segments | Renewables Segment    
Disaggregation of Revenue [Line Items]    
Total revenue 66 33
Operating Segments | Renewables Segment | Renewable diesel    
Disaggregation of Revenue [Line Items]    
Revenue 24 10
Operating Segments | Renewables Segment | Renewable fuel credits    
Disaggregation of Revenue [Line Items]    
Revenue 4 7
Operating Segments | Nitrogen Fertilizer Segment    
Disaggregation of Revenue [Line Items]    
Other revenue 15 10
Total revenue 143 128
Operating Segments | Nitrogen Fertilizer Segment | Ammonia    
Disaggregation of Revenue [Line Items]    
Revenue 33 37
Operating Segments | Nitrogen Fertilizer Segment | UAN    
Disaggregation of Revenue [Line Items]    
Revenue 86 76
Operating Segments | Nitrogen Fertilizer Segment | Urea Products    
Disaggregation of Revenue [Line Items]    
Revenue $ 9 $ 5