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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Net sales $ 675 $ 1,687 $ 1,806 $ 3,173  
Operating income (loss) (26) 192 (160) 352  
Interest expense, net (31) (26) (67) (52)  
Investment income from marketable securities 21 0 52 0  
Other (loss) income, net (1) 3 0 6  
(Loss) income before income tax expense (37) 169 (175) 306  
Depreciation and amortization 74 78 138 145  
Capital expenditures 26 22 73 46  
Total Assets 3,928   3,928   $ 3,905
Operating Segments | Petroleum          
Segment Reporting Information [Line Items]          
Net sales 572 1,552 1,629 2,949  
Operating income (loss) 5 163 (122) 319  
Depreciation and amortization 50 52 99 101  
Capital expenditures 22 17 63 38  
Total Assets 2,872   2,872   3,187
Operating Segments | Nitrogen Fertilizer          
Segment Reporting Information [Line Items]          
Net sales 105 138 180 230  
Operating income (loss) (26) 35 (31) 44  
Depreciation and amortization 24 25 39 42  
Capital expenditures 3 2 8 5  
Total Assets 1,043   1,043   1,138
Other          
Segment Reporting Information [Line Items]          
Net sales (2) (3) (3) (6)  
Operating income (loss) (5) (6) (7) (11)  
Depreciation and amortization 0 1 0 2  
Capital expenditures 1 $ 3 2 $ 3  
Total Assets $ 13   $ 13   $ (420)