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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (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
Segment Reporting Information [Line Items]                      
Net sales $ 1,738 $ 1,935 $ 1,915 $ 1,536 $ 1,593 $ 1,454 $ 1,434 $ 1,507 $ 7,124 $ 5,988 $ 4,782
Operating income (loss) 124 $ 164 $ 108 $ 136 (4) $ 72 $ (7) $ 84 532 145 72
Interest expense, net                 (102) (109) (83)
Other income, net                 15 2 2
Income (loss) before income taxes                 445 38 (9)
Depreciation and amortization                 274 258 229
Capital expenditures                 102 120 133
Total assets 4,000       3,953       4,000 3,953 4,159
Operating Segments | Petroleum                      
Segment Reporting Information [Line Items]                      
Net sales                 6,780 5,664 4,431
Operating income (loss)                 544 172 60
Depreciation and amortization                 196 177 165
Capital expenditures                 79 101 102
Total assets 2,453       2,416       2,453 2,416 2,441
Operating Segments | Nitrogen Fertilizer                      
Segment Reporting Information [Line Items]                      
Net sales                 351 331 356
Operating income (loss)                 6 (10) 26
Depreciation and amortization                 72 74 58
Capital expenditures                 19 14 23
Total assets 1,254       1,234       1,254 1,234 1,312
Other                      
Segment Reporting Information [Line Items]                      
Net sales                 (7) (7) (5)
Operating income (loss)                 (18) (17) (14)
Depreciation and amortization                 6 7 6
Capital expenditures                 4 5 8
Total assets $ 293       $ 303       $ 293 $ 303 $ 406