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Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]          
Net sales $ 1,914 $ 1,434 $ 3,451 $ 2,942  
Operating income (loss) 111 1 201 69  
Interest expense, net (27) (27) (53) (54)  
Gain on derivatives, net 10 0 70 12  
Other income, net 2 0 3 0  
Income (loss) before income tax expense 96 (26) 221 27  
Depreciation and amortization 55 54 108 105  
Capital expenditures 22 33 42 58  
Total assets 3,850   3,850   $ 3,807
Operating Segments | Petroleum          
Segment Reporting Information [Line Items]          
Net sales 1,824 1,338 3,282 2,762  
Operating income (loss) 117 (7) 214 59  
Depreciation and amortization 33 32 67 66  
Capital expenditures 16 28 32 48  
Total assets 2,366   2,366   2,270
Operating Segments | Nitrogen Fertilizer          
Segment Reporting Information [Line Items]          
Net sales 93 98 173 183  
Operating income (loss) 0 12 (4) 18  
Depreciation and amortization 20 20 37 35  
Capital expenditures 6 4 9 9  
Total assets 1,200   1,200   1,234
Other          
Segment Reporting Information [Line Items]          
Net sales (3) (2) (4) (3)  
Operating income (loss) (6) (4) (9) (8)  
Depreciation and amortization 2 2 4 4  
Capital expenditures 0 $ 1 1 $ 1  
Total assets $ 284   $ 284   $ 303