Revenue - Revenue Disaggregated by Major Product (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 |
Disaggregation of Revenue [Line Items] | | | | |
Net sales | $ 675 | $ 1,687 | $ 1,806 | $ 3,173 |
Revenue from product sales | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 665 | 1,678 | 1,757 | 3,138 |
Gasoline | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 300 | 816 | 816 | 1,490 |
Distillates | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 246 | 689 | 720 | 1,344 |
Ammonia | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 37 | 50 | 51 | 63 |
UAN | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 55 | 74 | 102 | 138 |
Other urea products | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 4 | 5 | 7 | 10 |
Freight revenue | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 11 | 13 | 24 | 26 |
Other | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 12 | 31 | 37 | 67 |
Crude oil sales | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 10 | 6 | 48 | 29 |
Other revenue | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Other revenue | | 3 | 1 | 6 |
Operating Segments | Petroleum | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Net sales | 572 | 1,552 | 1,629 | 2,949 |
Operating Segments | Petroleum | Revenue from product sales | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 562 | 1,545 | 1,580 | 2,918 |
Operating Segments | Petroleum | Gasoline | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 300 | 816 | 816 | 1,490 |
Operating Segments | Petroleum | Distillates | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 246 | 689 | 720 | 1,344 |
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 | 4 | 6 | 9 | 11 |
Operating Segments | Petroleum | Other | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 12 | 34 | 35 | 73 |
Operating Segments | Petroleum | Crude oil sales | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 10 | 6 | 48 | 29 |
Operating Segments | Petroleum | Other revenue | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Other revenue | | 1 | 1 | 2 |
Operating Segments | Nitrogen Fertilizer | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Net sales | 105 | 138 | 180 | 230 |
Operating Segments | Nitrogen Fertilizer | Revenue from product sales | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 105 | 136 | 180 | 226 |
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 | 37 | 50 | 51 | 63 |
Operating Segments | Nitrogen Fertilizer | UAN | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 55 | 74 | 102 | 138 |
Operating Segments | Nitrogen Fertilizer | Other urea products | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | 4 | 5 | 7 | 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 | 2 | 0 | 5 | 0 |
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 |
Other / Eliminations | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Net sales | (2) | (3) | (3) | (6) |
Other / Eliminations | Revenue from product sales | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue from product sales | (2) | (3) | (3) | (6) |
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 | (2) | (3) | (3) | (6) |
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 |