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Revenue - Revenue Disaggregated by Major Product (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Net sales $ 1,622 $ 1,935 $ 4,794 $ 5,386
Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 1,615 1,922 4,755 5,307
Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 796 951 2,285 2,558
Distillates        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 692 844 2,035 2,334
Ammonia        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 11 11 74 51
UAN        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 62 53 200 157
Other urea products        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 5 5 14 15
Freight revenue        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 15 15 41 41
Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 34 43 106 151
Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 7 12 36 75
Other revenue        
Disaggregation of Revenue [Line Items]        
Other revenue   1 3 4
Operating Segments | Petroleum        
Disaggregation of Revenue [Line Items]        
Net sales 1,535 1,857 4,484 5,139
Operating Segments | Petroleum | Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 1,528 1,844 4,445 5,060
Operating Segments | Petroleum | Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 796 951 2,285 2,558
Operating Segments | Petroleum | Distillates        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 692 844 2,035 2,334
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 6 6 17 17
Operating Segments | Petroleum | Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 34 43 108 151
Operating Segments | Petroleum | Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 7 12 36 75
Operating Segments | Petroleum | Other revenue        
Disaggregation of Revenue [Line Items]        
Other revenue   1 3 4
Operating Segments | Nitrogen Fertilizer        
Disaggregation of Revenue [Line Items]        
Net sales 89 80 318 253
Operating Segments | Nitrogen Fertilizer | Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 89 80 318 253
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 11 11 74 51
Operating Segments | Nitrogen Fertilizer | UAN        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 62 53 200 157
Operating Segments | Nitrogen Fertilizer | Other urea products        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 5 5 14 15
Operating Segments | Nitrogen Fertilizer | Freight revenue        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 9 9 24 24
Operating Segments | Nitrogen Fertilizer | Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 2 2 6 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 0
Other / Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales (2) (2) (8) (6)
Other / Eliminations | Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales (2) (2) (8) (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) (2) (8) (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