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Revenue - Revenue Disaggregated by Major Product (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Net sales $ 1,463 $ 1,130
Revenue from product sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 1,433 1,093
Gasoline    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 750 516
Distillates    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 587 476
Ammonia    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 10 14
UAN    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 38 47
Other urea products    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 5 4
Freight revenue    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 11 13
Other    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 32 23
Crude oil sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 29 37
Other revenue    
Disaggregation of Revenue [Line Items]    
Other revenue 1  
Operating Segments | Petroleum    
Disaggregation of Revenue [Line Items]    
Net sales 1,404 1,057
Operating Segments | Petroleum | Revenue from product sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 1,374 1,020
Operating Segments | Petroleum | Gasoline    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 750 516
Operating Segments | Petroleum | Distillates    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 587 476
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 5 5
Operating Segments | Petroleum | Other    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 32 23
Operating Segments | Petroleum | Crude oil sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 29 37
Operating Segments | Petroleum | Other revenue    
Disaggregation of Revenue [Line Items]    
Other revenue 1  
Operating Segments | Nitrogen Fertilizer    
Disaggregation of Revenue [Line Items]    
Net sales 61 75
Operating Segments | Nitrogen Fertilizer | Revenue from product sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 61 75
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 10 14
Operating Segments | Nitrogen Fertilizer | UAN    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 38 47
Operating Segments | Nitrogen Fertilizer | Other urea products    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 5 4
Operating Segments | Nitrogen Fertilizer | Freight revenue    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 6 8
Operating Segments | Nitrogen Fertilizer | Other    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 2 2
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  
Other / Elimination    
Disaggregation of Revenue [Line Items]    
Net sales (2) (2)
Other / Elimination | Revenue from product sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales (2) (2)
Other / Elimination | Gasoline    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Elimination | Distillates    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Elimination | Ammonia    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Elimination | UAN    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Elimination | Other urea products    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Elimination | Freight revenue    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 0
Other / Elimination | Other    
Disaggregation of Revenue [Line Items]    
Revenue from product sales (2) (2)
Other / Elimination | Crude oil sales    
Disaggregation of Revenue [Line Items]    
Revenue from product sales 0 $ 0
Other / Elimination | Other revenue    
Disaggregation of Revenue [Line Items]    
Other revenue $ 0