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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]            
Net sales $ 1,687 $ 1,914 $ 3,173 $ 3,451    
Operating Income 192 107 352 244    
Interest expense, net (26) (26) (52) (53)    
Other income, net 3 2 6 3    
Income (loss) before income taxes 169 83 306 194    
Depreciation and amortization 78 71 145 137    
Capital expenditures 22 23 46 42    
Total Assets 3,830   3,830   $ 4,079 $ 4,000
Operating Segments | Petroleum            
Segment Reporting Information [Line Items]            
Net sales 1,552 1,824 2,949 3,282    
Operating Income 163 113 319 256    
Depreciation and amortization 52 49 101 97    
Capital expenditures 17 15 38 29    
Total Assets 2,833   2,833     2,453
Operating Segments | Nitrogen Fertilizer            
Segment Reporting Information [Line Items]            
Net sales 138 93 230 173    
Operating Income 35 0 44 (4)    
Depreciation and amortization 25 20 42 37    
Capital expenditures 2 7 5 11    
Total Assets 1,190   1,190     1,254
Other            
Segment Reporting Information [Line Items]            
Net sales (3) (3) (6) (4)    
Operating Income (6) (6) (11) (8)    
Depreciation and amortization 1 2 2 3    
Capital expenditures 3 $ 1 3 $ 2    
Total Assets $ (193)   $ (193)     $ 293