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Revenue - Revenue Disaggregated by Major Product (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Total revenue $ 1,687 $ 1,914 $ 3,173 $ 3,451
Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 1,678 1,882 3,138 3,384
Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 816 896 1,490 1,608
Distillates        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 689 832 1,344 1,484
Ammonia        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 50 28 63 40
UAN        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 74 51 138 104
Other urea products        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 5 5 10 10
Freight revenue        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 13 13 26 26
Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 31 57 67 112
Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 6 31 29 64
Other revenue        
Disaggregation of Revenue [Line Items]        
Other revenue 3 1 6 3
Operating Segments | Petroleum        
Disaggregation of Revenue [Line Items]        
Total revenue 1,552 1,824 2,949 3,282
Operating Segments | Petroleum | Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 1,545 1,792 2,918 3,215
Operating Segments | Petroleum | Gasoline        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 816 896 1,490 1,608
Operating Segments | Petroleum | Distillates        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 689 832 1,344 1,484
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 11 11
Operating Segments | Petroleum | Other        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 34 58 73 112
Operating Segments | Petroleum | Crude oil sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 6 31 29 64
Operating Segments | Petroleum | Other revenue        
Disaggregation of Revenue [Line Items]        
Other revenue 1 1 2 3
Operating Segments | Nitrogen Fertilizer        
Disaggregation of Revenue [Line Items]        
Total revenue 138 93 230 173
Operating Segments | Nitrogen Fertilizer | Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 136 93 226 173
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 50 28 63 40
Operating Segments | Nitrogen Fertilizer | UAN        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 74 51 138 104
Operating Segments | Nitrogen Fertilizer | Other urea products        
Disaggregation of Revenue [Line Items]        
Revenue from product sales 5 5 10 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 0 2 0 4
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 0
Other / Eliminations        
Disaggregation of Revenue [Line Items]        
Total revenue (3) (3) (6) (4)
Other / Eliminations | Revenue from product sales        
Disaggregation of Revenue [Line Items]        
Revenue from product sales (3) (3) (6) (4)
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 (3) (3) (6) (4)
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 $ 0