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Revenue - Revenue Disaggregated by Major Product (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Net sales $ 1,005 $ 1,622 $ 2,811 $ 4,794
Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 997 1,615 2,755 4,755
Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 513 796 1,329 2,285
Distillates        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 381 692 1,102 2,035
Ammonia        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 13 11 64 74
UAN        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 51 62 153 200
Other urea products        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 3 5 11 14
Freight revenue        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 14 15 37 41
Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 22 34 59 106
Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 8 7 55 36
Other revenue        
Disaggregation of Revenue [Line Items]        
Other revenue 0   1  
Operating Segments | Petroleum        
Disaggregation of Revenue [Line Items]        
Net sales 927 1,535 2,556 4,484
Operating Segments | Petroleum | Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 919 1,528 2,500 4,445
Operating Segments | Petroleum | Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 513 796 1,329 2,285
Operating Segments | Petroleum | Distillates        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 381 692 1,102 2,035
Operating Segments | Petroleum | Ammonia        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Operating Segments | Petroleum | UAN        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Operating Segments | Petroleum | Other urea products        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Operating Segments | Petroleum | Freight revenue        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 4 6 13 17
Operating Segments | Petroleum | Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 21 34 56 108
Operating Segments | Petroleum | Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 8 7 55 36
Operating Segments | Petroleum | Other revenue        
Disaggregation of Revenue [Line Items]        
Other revenue 0   1  
Operating Segments | Nitrogen Fertilizer        
Disaggregation of Revenue [Line Items]        
Net sales 79 89 260 318
Operating Segments | Nitrogen Fertilizer | Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 79 89 260 318
Operating Segments | Nitrogen Fertilizer | Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Operating Segments | Nitrogen Fertilizer | Distillates        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Operating Segments | Nitrogen Fertilizer | Ammonia        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 13 11 64 74
Operating Segments | Nitrogen Fertilizer | UAN        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 51 62 153 200
Operating Segments | Nitrogen Fertilizer | Other urea products        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 3 5 11 14
Operating Segments | Nitrogen Fertilizer | Freight revenue        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 10 9 24 24
Operating Segments | Nitrogen Fertilizer | Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 2 2 8 6
Operating Segments | Nitrogen Fertilizer | Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Operating Segments | Nitrogen Fertilizer | Other revenue        
Disaggregation of Revenue [Line Items]        
Other revenue 0   0  
Other / Elimination        
Disaggregation of Revenue [Line Items]        
Net sales (1) (2) (5) (8)
Other / Elimination | Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales (1) (2) (5) (8)
Other / Elimination | Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Other / Elimination | Distillates        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Other / Elimination | Ammonia        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Other / Elimination | UAN        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Other / Elimination | Other urea products        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Other / Elimination | Freight revenue        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Other / Elimination | Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales (1) (2) (5) (8)
Other / Elimination | Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 $ 0 0 $ 0
Other / Elimination | Other revenue        
Disaggregation of Revenue [Line Items]        
Other revenue $ 0   $ 0