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Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]          
Net sales $ 1,935 $ 1,454 $ 5,386 $ 4,395  
Operating Income 174 79 375 148  
Interest expense, net (26) (28) (79) (81)  
Loss on derivatives, net 5 (17) 75 (5)  
Other income, net 3 0 6 0  
Income before income tax expense 156 34 377 62  
Depreciation and amortization 51 54 159 159  
Capital expenditures 26 23 68 80  
Total assets 4,002   4,002   $ 3,807
Operating Segments | Petroleum          
Segment Reporting Information [Line Items]          
Net sales 1,857 1,386 5,139 4,148  
Operating Income 176 99 390 157  
Depreciation and amortization 34 33 101 100  
Capital expenditures 18 19 50 66  
Total assets 2,505   2,505   2,270
Operating Segments | Nitrogen Fertilizer          
Segment Reporting Information [Line Items]          
Net sales 80 69 253 253  
Operating Income 3 (16) (1) 2  
Depreciation and amortization 16 20 53 55  
Capital expenditures 6 3 15 11  
Total assets 1,219   1,219   1,234
Other          
Segment Reporting Information [Line Items]          
Net sales (2) (1) (6) (6)  
Operating Income (5) (4) (14) (11)  
Depreciation and amortization 1 1 5 4  
Capital expenditures 2 $ 1 3 $ 3  
Total assets $ 278   $ 278   $ 303