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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]        
Net sales $ 1,486 $ 1,537    
Operating Income 160 136    
Interest expense, net (26) (27)    
Other income, net 3 2    
Income (loss) before income taxes 137 111    
Depreciation and amortization 67 67    
Capital expenditures 23 19    
Total Assets 3,874   $ 4,079 $ 4,000
Operating Segments | Petroleum        
Segment Reporting Information [Line Items]        
Net sales 1,397 1,458    
Operating Income 156 143    
Depreciation and amortization 49 48    
Capital expenditures 20 14    
Total Assets 2,714     2,452
Operating Segments | Nitrogen Fertilizer        
Segment Reporting Information [Line Items]        
Net sales 92 80    
Operating Income 9 (3)    
Depreciation and amortization 16 16    
Capital expenditures 3 4    
Total Assets 1,247     1,254
Other        
Segment Reporting Information [Line Items]        
Net sales (3) (1)    
Operating Income (5) (4)    
Depreciation and amortization 2 3    
Capital expenditures 0 $ 1    
Total Assets $ (87)     $ 294