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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Net sales $ 3,930 $ 6,364 $ 7,124
Operating (loss) income (333) 580 532
Interest expense, net (130) (102) (102)
Investment income from marketable securities 41 0 0
Other income, net 7 13 15
(Loss) income before income taxes (415) 491 445
Depreciation and amortization 278 287 274
Capital expenditures 121 114 111
Total assets 3,978 3,905  
Operating Segments | Petroleum      
Segment Reporting Information [Line Items]      
Net sales 3,586 5,968 6,780
Operating (loss) income (281) 574 544
Depreciation and amortization 202 202 196
Capital expenditures 90 89 89
Total assets 2,991 3,187  
Operating Segments | Nitrogen Fertilizer      
Segment Reporting Information [Line Items]      
Net sales 350 404 351
Operating (loss) income (35) 27 6
Depreciation and amortization 76 80 72
Capital expenditures 16 20 19
Total assets 1,033 1,138  
Other      
Segment Reporting Information [Line Items]      
Net sales (6) (8) (7)
Operating (loss) income (17) (21) (18)
Depreciation and amortization 0 5 6
Capital expenditures 15 5 $ 3
Total assets $ (46) $ (420)