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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Net sales $ 1,005 $ 1,622 $ 2,811 $ 4,794  
Operating (loss) income (46) 159 (206) 511  
Interest expense, net (31) (26) (98) (77)  
Investment loss from marketable securities (65) 0 (13) 0  
Other income, net 3 5 3 10  
(Loss) income before income tax expense (139) 138 (314) 444  
Depreciation and amortization 69 71 208 217  
Capital expenditures 23 34 96 81  
Total Assets 3,876   3,876   $ 3,905
Operating Segments | Petroleum          
Segment Reporting Information [Line Items]          
Net sales 927 1,535 2,556 4,484  
Operating (loss) income (39) 173 (161) 492  
Depreciation and amortization 51 51 150 152  
Capital expenditures 17 27 80 65  
Total Assets 2,919   2,919   3,187
Operating Segments | Nitrogen Fertilizer          
Segment Reporting Information [Line Items]          
Net sales 79 89 260 318  
Operating (loss) income (3) (8) (34) 36  
Depreciation and amortization 18 18 57 60  
Capital expenditures 5 7 13 12  
Total Assets 1,047   1,047   1,138
Other          
Segment Reporting Information [Line Items]          
Net sales (1) (2) (5) (8)  
Operating (loss) income (4) (6) (11) (17)  
Depreciation and amortization 0 2 1 5  
Capital expenditures 1 $ 0 3 $ 4  
Total Assets $ (90)   $ (90)   $ (420)