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Revenue - Revenue Disaggregated by Major Product (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Total revenue $ 1,737 $ 1,935 $ 1,915 $ 1,536 $ 1,593 $ 1,454 $ 1,434 $ 1,507 $ 7,124 $ 5,988 $ 4,782
Revenue from product sales                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 7,023    
Gasoline                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 3,383    
Distillates                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 3,067    
Ammonia                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 66    
UAN                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 222    
Other urea products                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 21    
Freight revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 57    
Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 207    
Crude oil sales                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 96    
Other revenue                      
Disaggregation of Revenue [Line Items]                      
Other revenue                 5    
Operating Segments | Petroleum                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 6,780 5,664 4,431
Operating Segments | Petroleum | Revenue from product sales                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 6,679    
Operating Segments | Petroleum | Gasoline                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 3,383    
Operating Segments | Petroleum | Distillates                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 3,067    
Operating Segments | Petroleum | Ammonia                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Operating Segments | Petroleum | UAN                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Operating Segments | Petroleum | Other urea products                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Operating Segments | Petroleum | Freight revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 23    
Operating Segments | Petroleum | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 206    
Operating Segments | Petroleum | Crude oil sales                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 96    
Operating Segments | Petroleum | Other revenue                      
Disaggregation of Revenue [Line Items]                      
Other revenue                 5    
Operating Segments | Nitrogen Fertilizer                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 351 $ 331 $ 356
Operating Segments | Nitrogen Fertilizer | Revenue from product sales                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 351    
Operating Segments | Nitrogen Fertilizer | Gasoline                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Operating Segments | Nitrogen Fertilizer | Distillates                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Operating Segments | Nitrogen Fertilizer | Ammonia                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 66    
Operating Segments | Nitrogen Fertilizer | UAN                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 222    
Operating Segments | Nitrogen Fertilizer | Other urea products                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 21    
Operating Segments | Nitrogen Fertilizer | Freight revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 34    
Operating Segments | Nitrogen Fertilizer | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 8    
Operating Segments | Nitrogen Fertilizer | Crude oil sales                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Operating Segments | Nitrogen Fertilizer | Other revenue                      
Disaggregation of Revenue [Line Items]                      
Other revenue                 0    
Other / Eliminations                      
Disaggregation of Revenue [Line Items]                      
Total revenue                 (7)    
Other / Eliminations | Revenue from product sales                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 (7)    
Other / Eliminations | Gasoline                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Other / Eliminations | Distillates                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Other / Eliminations | Ammonia                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Other / Eliminations | UAN                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Other / Eliminations | Other urea products                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Other / Eliminations | Freight revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Other / Eliminations | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 (7)    
Other / Eliminations | Crude oil sales                      
Disaggregation of Revenue [Line Items]                      
Revenue from product sales                 0    
Other / Eliminations | Other revenue                      
Disaggregation of Revenue [Line Items]                      
Other revenue                 $ 0