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Revenue - Revenue Disaggregated by Major Product (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Total revenue $ 3,930 $ 6,364 $ 7,124
Revenue from product sales      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 3,866 6,303 7,023
Gasoline      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,882 3,050 3,383
Distillates      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,543 2,705 3,083
Ammonia      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 94 94 66
UAN      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 198 251 222
Other urea products      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 15 18 21
Freight revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 51 56 57
Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 83 129 191
Crude oil sales      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 63 58 96
Other revenue      
Disaggregation of Revenue [Line Items]      
Other revenue 1 3  
Other revenue     5
Operating Segments | Petroleum      
Disaggregation of Revenue [Line Items]      
Total revenue 3,586 5,968 6,780
Operating Segments | Petroleum | Revenue from product sales      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 3,522 5,907 6,679
Operating Segments | Petroleum | Gasoline      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,882 3,050 3,383
Operating Segments | Petroleum | Distillates      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,543 2,705 3,083
Operating Segments | Petroleum | Ammonia      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Operating Segments | Petroleum | UAN      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Operating Segments | Petroleum | Other urea products      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Operating Segments | Petroleum | Freight revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 18 23 23
Operating Segments | Petroleum | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 79 129 190
Operating Segments | Petroleum | Crude oil sales      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 63 58 96
Operating Segments | Petroleum | Other revenue      
Disaggregation of Revenue [Line Items]      
Other revenue 1 3  
Other revenue     5
Operating Segments | Nitrogen Fertilizer      
Disaggregation of Revenue [Line Items]      
Total revenue 350 404 351
Operating Segments | Nitrogen Fertilizer | Revenue from product sales      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 350 404 351
Operating Segments | Nitrogen Fertilizer | Gasoline      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Operating Segments | Nitrogen Fertilizer | Distillates      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Operating Segments | Nitrogen Fertilizer | Ammonia      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 94 94 66
Operating Segments | Nitrogen Fertilizer | UAN      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 198 251 222
Operating Segments | Nitrogen Fertilizer | Other urea products      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 15 18 21
Operating Segments | Nitrogen Fertilizer | Freight revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 33 33 34
Operating Segments | Nitrogen Fertilizer | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 10 8 8
Operating Segments | Nitrogen Fertilizer | Crude oil sales      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Operating Segments | Nitrogen Fertilizer | Other revenue      
Disaggregation of Revenue [Line Items]      
Other revenue 0 0  
Other revenue     0
Other / Eliminations      
Disaggregation of Revenue [Line Items]      
Total revenue (6) (8) (7)
Other / Eliminations | Revenue from product sales      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers (6) (8) (7)
Other / Eliminations | Gasoline      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Other / Eliminations | Distillates      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Other / Eliminations | Ammonia      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Other / Eliminations | UAN      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Other / Eliminations | Other urea products      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Other / Eliminations | Freight revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Other / Eliminations | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers (6) (8) (7)
Other / Eliminations | Crude oil sales      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 0
Other / Eliminations | Other revenue      
Disaggregation of Revenue [Line Items]      
Other revenue $ 0 $ 0  
Other revenue     $ 0