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Revenue - Revenue Disaggregated by Major Product (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Total revenue $ 1,486 $ 1,537
Revenue from product sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 1,462 1,503
Gasoline    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 673 712
Distillates    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 651 652
Ammonia    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 13 12
UAN    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 64 53
Other urea products    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 5 5
Freight revenue    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 14 14
Other    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 42 55
Crude oil sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 23 32
Other revenue    
Disaggregation of Revenue [Line Items]    
Other revenue 1 2
Operating Segments | Petroleum    
Disaggregation of Revenue [Line Items]    
Total revenue 1,397 1,458
Operating Segments | Petroleum | Revenue from product sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 1,373 1,425
Operating Segments | Petroleum | Gasoline    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 673 712
Operating Segments | Petroleum | Distillates    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 651 652
Operating Segments | Petroleum | Ammonia    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Operating Segments | Petroleum | UAN    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Operating Segments | Petroleum | Other urea products    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Operating Segments | Petroleum | Freight revenue    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 6 5
Operating Segments | Petroleum | Other    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 43 56
Operating Segments | Petroleum | Crude oil sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 23 32
Operating Segments | Petroleum | Other revenue    
Disaggregation of Revenue [Line Items]    
Other revenue 1 1
Operating Segments | Nitrogen Fertilizer    
Disaggregation of Revenue [Line Items]    
Total revenue 92 80
Operating Segments | Nitrogen Fertilizer | Revenue from product sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 92 79
Operating Segments | Nitrogen Fertilizer | Gasoline    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Operating Segments | Nitrogen Fertilizer | Distillates    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Operating Segments | Nitrogen Fertilizer | Ammonia    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 13 12
Operating Segments | Nitrogen Fertilizer | UAN    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 64 53
Operating Segments | Nitrogen Fertilizer | Other urea products    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 5 5
Operating Segments | Nitrogen Fertilizer | Freight revenue    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 8 9
Operating Segments | Nitrogen Fertilizer | Other    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 2 0
Operating Segments | Nitrogen Fertilizer | Crude oil sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Operating Segments | Nitrogen Fertilizer | Other revenue    
Disaggregation of Revenue [Line Items]    
Other revenue 0 1
Other / Eliminations    
Disaggregation of Revenue [Line Items]    
Total revenue (3) (1)
Other / Eliminations | Revenue from product sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales (3) (1)
Other / Eliminations | Gasoline    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Eliminations | Distillates    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Eliminations | Ammonia    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Eliminations | UAN    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Eliminations | Other urea products    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Eliminations | Freight revenue    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Eliminations | Other    
Disaggregation of Revenue [Line Items]    
Revenue from product sales (3) (1)
Other / Eliminations | Crude oil sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Eliminations | Other revenue    
Disaggregation of Revenue [Line Items]    
Other revenue $ 0 $ 0