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Business Segments - Summary of Operating Results, Capital Expenditures, and Total Asset Information by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]              
Net sales $ 1,761   $ 1,967   $ 3,407 $ 3,829  
Cost of materials and other 1,582   1,667   3,099 3,130  
Direct operating expenses (exclusive of depreciation and amortization) 169   173   324 337  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 36   28   73 63  
Depreciation and amortization 78   72   146 149  
(Gain) loss on asset disposal (1)   0   0 1  
Operating (loss) income (103)   27   (235) 149  
Reconciliation of Operating (loss) income to Net loss:              
Interest expense, net (30)   (19)   (55) (39)  
Other income, net 1   4   4 8  
Income tax expense (benefit) (42)   (26)   (91) (10)  
Net (loss) income (90) $ (105) 38 $ 90 (195) 128  
Other segment disclosures:              
Interest income 7   8   16 21  
Interest expense (37)   (27)   (71) (60)  
Capital expenditures 36   41   92 92  
Assets 3,984       3,984   $ 4,263
Petroleum Segment              
Segment Reporting Information [Line Items]              
Net sales 1,558   1,792   3,033 3,510  
Renewables Segment              
Segment Reporting Information [Line Items]              
Net sales 35   42   64 58  
Nitrogen Fertilizer Segment              
Segment Reporting Information [Line Items]              
Net sales 168   133   310 261  
Operating Segments | Petroleum Segment              
Segment Reporting Information [Line Items]              
Net sales 1,561   1,795   3,038 3,517  
Cost of materials and other 1,526   1,610   3,008 3,041  
Direct operating expenses (exclusive of depreciation and amortization) 102   118   193 221  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 20   14   42 34  
Depreciation and amortization 48   43   90 92  
(Gain) loss on asset disposal (2)   0   0 1  
Operating (loss) income (133)   10   (295) 128  
Other segment disclosures:              
Interest income 4   5   11 11  
Interest expense (9)   0   (16) (1)  
Capital expenditures 23   33   72 69  
Assets 3,011       3,011   3,288
Operating Segments | Renewables Segment              
Segment Reporting Information [Line Items]              
Net sales 76   63   142 97  
Cost of materials and other 71   58   121 88  
Direct operating expenses (exclusive of depreciation and amortization) 7   8   14 13  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 3   2   6 5  
Depreciation and amortization 6   6   12 12  
(Gain) loss on asset disposal 0   0   0 0  
Operating (loss) income (11)   (11)   (11) (21)  
Other segment disclosures:              
Interest income 0   0   0 1  
Interest expense 0   0   0 0  
Capital expenditures 2   2   2 10  
Assets 414       414   420
Operating Segments | Nitrogen Fertilizer Segment              
Segment Reporting Information [Line Items]              
Net sales 169   133   311 261  
Cost of materials and other 33   26   60 51  
Direct operating expenses (exclusive of depreciation and amortization) 60   47   115 103  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 8   6   16 14  
Depreciation and amortization 21   20   39 39  
(Gain) loss on asset disposal 1   0   0 0  
Operating (loss) income 46   34   81 54  
Other segment disclosures:              
Interest income 1   0   3 2  
Interest expense (9)   (8)   (18) (17)  
Capital expenditures 10   5   16 10  
Assets 998       998   1,019
Corporate And Eliminations              
Segment Reporting Information [Line Items]              
Net sales (45)   (24)   (84) (46)  
Other segment disclosures:              
Assets (439)       (439)   $ (464)
Other / Eliminations              
Segment Reporting Information [Line Items]              
Net sales 0   0   0 0  
Cost of materials and other (48)   (27)   (90) (50)  
Direct operating expenses (exclusive of depreciation and amortization) 0   0   2 0  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 5   6   9 10  
Depreciation and amortization 3   3   5 6  
(Gain) loss on asset disposal 0   0   0 0  
Operating (loss) income (5)   (6)   (10) (12)  
Other segment disclosures:              
Interest income 2   3   2 7  
Interest expense (19)   (19)   (37) (42)  
Capital expenditures 1   1   2 3  
Inter-segment fees and sales              
Segment Reporting Information [Line Items]              
Net sales (45)   (24)   (84) (46)  
Inter-segment fees and sales | Petroleum Segment              
Segment Reporting Information [Line Items]              
Net sales (3)   (3)   (5) (7)  
Inter-segment fees and sales | Renewables Segment              
Segment Reporting Information [Line Items]              
Net sales (41)   (21)   (78) (39)  
Inter-segment fees and sales | Nitrogen Fertilizer Segment              
Segment Reporting Information [Line Items]              
Net sales $ (1)   $ 0   $ (1) $ 0