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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]            
Net sales $ 1,622 $ 1,935 $ 4,794 $ 5,386    
Operating Income 159 166 511 409    
Interest expense, net (26) (26) (77) (79)    
Other income, net 5 3 10 6    
Income (loss) before income taxes 138 143 444 336    
Depreciation and amortization 71 66 217 204    
Capital expenditures 34 28 81 70    
Total Assets 3,962   3,962   $ 4,079 $ 4,000
Operating Segments | Petroleum            
Segment Reporting Information [Line Items]            
Net sales 1,535 1,857 4,484 5,139    
Operating Income 173 167 492 424    
Depreciation and amortization 51 49 152 146    
Capital expenditures 27 22 65 51    
Total Assets 3,076   3,076     2,453
Operating Segments | Nitrogen Fertilizer            
Segment Reporting Information [Line Items]            
Net sales 89 80 318 253    
Operating Income (8) 3 36 (2)    
Depreciation and amortization 18 16 60 53    
Capital expenditures 7 5 12 16    
Total Assets 1,180   1,180     1,254
Other            
Segment Reporting Information [Line Items]            
Net sales (2) (2) (8) (6)    
Operating Income (6) (4) (17) (13)    
Depreciation and amortization 2 1 5 5    
Capital expenditures 0 $ 1 4 $ 3    
Total Assets $ (294)   $ (294)     $ 293