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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Net sales $ 1,783 $ 675 $ 3,246 $ 1,806  
Operating (loss) income 6 (26) (129) (160)  
Interest expense, net (38) (31) (69) (67)  
Investment income on marketable securities 21 21 83 52  
Other income, net 3 (1) 10 0  
Loss before income tax benefit (8) (37) (105) (175)  
Depreciation and amortization 72 74 138 138  
Capital expenditures 83 26 151 73  
Total Assets 3,798   3,798   $ 3,978
Operating Segments | Petroleum          
Segment Reporting Information [Line Items]          
Net sales 1,648 572 3,052 1,629  
Operating (loss) income (20) 5 (136) (122)  
Depreciation and amortization 51 50 102 99  
Capital expenditures 9 22 19 63  
Total Assets 3,317   3,317   2,991
Operating Segments | Nitrogen Fertilizer          
Segment Reporting Information [Line Items]          
Net sales 138 105 199 180  
Operating (loss) income 30 (26) 16 (31)  
Depreciation and amortization 21 24 35 39  
Capital expenditures 4 3 7 8  
Total Assets 1,019   1,019   1,033
Other, including intersegment eliminations          
Segment Reporting Information [Line Items]          
Net sales (3) (2) (5) (3)  
Operating (loss) income (4) (5) (9) (7)  
Depreciation and amortization 0 0 1 0  
Capital expenditures 70 $ 1 125 $ 2  
Total Assets $ (538)   $ (538)   $ (46)