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Revenue - Revenue Disaggregated by Major Product (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Net sales $ 675 $ 1,687 $ 1,806 $ 3,173
Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 665 1,678 1,757 3,138
Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 300 816 816 1,490
Distillates        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 246 689 720 1,344
Ammonia        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 37 50 51 63
UAN        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 55 74 102 138
Other urea products        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 4 5 7 10
Freight revenue        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 11 13 24 26
Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 12 31 37 67
Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 10 6 48 29
Other revenue        
Disaggregation of Revenue [Line Items]        
Other revenue   3 1 6
Operating Segments | Petroleum        
Disaggregation of Revenue [Line Items]        
Net sales 572 1,552 1,629 2,949
Operating Segments | Petroleum | Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 562 1,545 1,580 2,918
Operating Segments | Petroleum | Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 300 816 816 1,490
Operating Segments | Petroleum | Distillates        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 246 689 720 1,344
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 9 11
Operating Segments | Petroleum | Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 12 34 35 73
Operating Segments | Petroleum | Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 10 6 48 29
Operating Segments | Petroleum | Other revenue        
Disaggregation of Revenue [Line Items]        
Other revenue   1 1 2
Operating Segments | Nitrogen Fertilizer        
Disaggregation of Revenue [Line Items]        
Net sales 105 138 180 230
Operating Segments | Nitrogen Fertilizer | Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 105 136 180 226
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 37 50 51 63
Operating Segments | Nitrogen Fertilizer | UAN        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 55 74 102 138
Operating Segments | Nitrogen Fertilizer | Other urea products        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 4 5 7 10
Operating Segments | Nitrogen Fertilizer | Freight revenue        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 7 7 15 15
Operating Segments | Nitrogen Fertilizer | Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 2 0 5 0
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   2 0 4
Other / Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales (2) (3) (3) (6)
Other / Eliminations | Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales (2) (3) (3) (6)
Other / Eliminations | Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Other / Eliminations | Distillates        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Other / Eliminations | Ammonia        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Other / Eliminations | UAN        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Other / Eliminations | Other urea products        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Other / Eliminations | Freight revenue        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 0 0 0 0
Other / Eliminations | Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales (2) (3) (3) (6)
Other / Eliminations | Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales $ 0 0 0 0
Other / Eliminations | Other revenue        
Disaggregation of Revenue [Line Items]        
Other revenue   $ 0 $ 0 $ 0