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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
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Net sales $ 1,646 $ 1,863  
Cost of materials and other 1,517 1,463  
Direct operating expenses (exclusive of depreciation and amortization) 154 164  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 37 36  
Depreciation and amortization 68 76  
Loss on asset disposal 1 1  
Segment operating (loss) income (131) 123  
Reconciliation of Segment operating (loss) income to Net loss:      
Interest expense, net (25) (20)  
Other income, net 2 4  
Income tax expense (benefit) 49 (17)  
Net (loss) income (105) 90  
Other segment disclosures:      
Interest income 10 13  
Interest expense (35) (33)  
Capital expenditures 55 51  
Assets 4,251   $ 4,263
Petroleum Segment      
Segment Reporting Information [Line Items]      
Net sales 1,475 1,718  
Renewables Segment      
Segment Reporting Information [Line Items]      
Net sales 28 17  
Nitrogen Fertilizer Segment      
Segment Reporting Information [Line Items]      
Net sales 143 128  
Operating Segments | Petroleum Segment      
Segment Reporting Information [Line Items]      
Net sales 1,477 1,722  
Cost of materials and other 1,482 1,432  
Direct operating expenses (exclusive of depreciation and amortization) 93 103  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 21 20  
Depreciation and amortization 41 48  
Loss on asset disposal 1 1  
Segment operating (loss) income (161) 118  
Other segment disclosures:      
Interest income 7 5  
Interest expense (7) (1)  
Capital expenditures 49 36  
Assets 3,297   3,288
Operating Segments | Renewables Segment      
Segment Reporting Information [Line Items]      
Net sales 66 33  
Cost of materials and other 50 29  
Direct operating expenses (exclusive of depreciation and amortization) 6 5  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 4 3  
Depreciation and amortization 6 6  
Loss on asset disposal 0 0  
Segment operating (loss) income 0 (10)  
Other segment disclosures:      
Interest income 0 0  
Interest expense 0 0  
Capital expenditures 0 8  
Assets 422   420
Operating Segments | Nitrogen Fertilizer Segment      
Segment Reporting Information [Line Items]      
Net sales 143 128  
Cost of materials and other 28 25  
Direct operating expenses (exclusive of depreciation and amortization) 54 56  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 8 8  
Depreciation and amortization 18 19  
Loss on asset disposal 0 0  
Segment operating (loss) income 35 20  
Other segment disclosures:      
Interest income 1 0  
Interest expense (9) (8)  
Capital expenditures 6 5  
Assets 1,014   1,019
Corporate And Eliminations      
Segment Reporting Information [Line Items]      
Net sales (40) (20)  
Other segment disclosures:      
Assets (482)   $ (464)
Other / Eliminations      
Segment Reporting Information [Line Items]      
Net sales 0 0  
Cost of materials and other (43) (23)  
Direct operating expenses (exclusive of depreciation and amortization) 1 0  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 4 5  
Depreciation and amortization 3 3  
Loss on asset disposal 0 0  
Segment operating (loss) income (5) (5)  
Other segment disclosures:      
Interest income 2 8  
Interest expense (19) (24)  
Capital expenditures 0 2  
Inter-segment fees and sales      
Segment Reporting Information [Line Items]      
Net sales (40) (20)  
Inter-segment fees and sales | Petroleum Segment      
Segment Reporting Information [Line Items]      
Net sales (2) (4)  
Inter-segment fees and sales | Renewables Segment      
Segment Reporting Information [Line Items]      
Net sales (38) (16)  
Inter-segment fees and sales | Nitrogen Fertilizer Segment      
Segment Reporting Information [Line Items]      
Net sales $ 0 $ 0