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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Net sales $ 1,463 $ 1,130  
Operating loss (135) (135)  
Interest expense, net (31) (35)  
Investment income on marketable securities 62 31  
Other income, net 7 2  
Loss before income tax benefit (97) (137)  
Depreciation and amortization 66 64  
Capital expenditures 68 48  
Total Assets 4,188   $ 3,978
Operating Segments | Petroleum      
Segment Reporting Information [Line Items]      
Net sales 1,404 1,057  
Operating loss (115) (127)  
Depreciation and amortization 51 48  
Capital expenditures 10 40  
Total Assets 3,207   2,991
Operating Segments | Nitrogen Fertilizer      
Segment Reporting Information [Line Items]      
Net sales 61 75  
Operating loss (14) (5)  
Depreciation and amortization 14 16  
Capital expenditures 3 6  
Total Assets 1,032   1,033
Other, including intersegment eliminations      
Segment Reporting Information [Line Items]      
Net sales (2) (2)  
Operating loss (6) (3)  
Depreciation and amortization 1 0  
Capital expenditures 55 $ 2  
Total Assets $ (51)   $ (46)