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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Net sales $ 1,130 $ 1,486  
Operating (loss) income (135) 160  
Interest expense, net (35) (26)  
Investment income from marketable securities 31 0  
Other income, net 2 3  
(Loss) income before income tax expense (137) 137  
Depreciation and amortization 64 67  
Capital expenditures 48 23  
Total Assets 4,125   $ 3,905
Operating Segments | Petroleum      
Segment Reporting Information [Line Items]      
Net sales 1,057 1,397  
Operating (loss) income (127) 156  
Depreciation and amortization 48 49  
Capital expenditures 40 20  
Total Assets 2,961   3,187
Operating Segments | Nitrogen Fertilizer      
Segment Reporting Information [Line Items]      
Net sales 75 92  
Operating (loss) income (5) 9  
Depreciation and amortization 16 16  
Capital expenditures 6 3  
Total Assets 1,134   1,138
Other      
Segment Reporting Information [Line Items]      
Net sales (2) (3)  
Operating (loss) income (3) (5)  
Depreciation and amortization 0 2  
Capital expenditures 2 $ 0  
Total Assets $ 30   $ (420)