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Business Segments - Summary of Operating Results, Capital Expenditures, and Total Asset Information by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Net sales $ 7,610 $ 9,247 $ 10,896
Cost of materials and other 6,448 7,013 8,766
Direct operating expenses (exclusive of depreciation and amortization) 667 670 719
Selling, general and administrative expenses (exclusive of depreciation and amortization) 139 141 149
Depreciation and amortization 298 298 288
Loss on asset disposals 0 2 11
Operating income 58 1,123 963
Reconciliation of Segment operating income (loss) to Net income:      
Interest expense, net (77) (52) (85)
Other income, net 38 14 (77)
Income tax expense (benefit) 26 (207) (157)
Net income 45 878 644
Other segment disclosures:      
Interest income 38 38 8
Interest expense (115) (90) (93)
Capital expenditures 181 197 203
Assets 4,263 4,707  
Petroleum Segment      
Segment Reporting Information [Line Items]      
Net sales 6,909 8,267 9,902
Renewables Segment      
Segment Reporting Information [Line Items]      
Net sales 177 299 158
Nitrogen Fertilizer Segment      
Segment Reporting Information [Line Items]      
Net sales 524 681 836
Operating Segments | Petroleum Segment      
Segment Reporting Information [Line Items]      
Net sales 6,920 8,287 9,919
Cost of materials and other 6,236 6,629 8,488
Direct operating expenses (exclusive of depreciation and amortization) 421 406 426
Selling, general and administrative expenses (exclusive of depreciation and amortization) 77 81 88
Depreciation and amortization 174 189 187
Loss on asset disposals   0 11
Operating income 12 982 719
Other segment disclosures:      
Interest income 22 75 43
Interest expense (1) 0 (2)
Capital expenditures 128 108 86
Assets 3,288 2,978  
Operating Segments | Renewables Segment      
Segment Reporting Information [Line Items]      
Net sales 289 559 338
Cost of materials and other 245 537 342
Direct operating expenses (exclusive of depreciation and amortization) 31 28 24
Selling, general and administrative expenses (exclusive of depreciation and amortization) 10 11 3
Depreciation and amortization 25 20 16
Loss on asset disposals   0 0
Operating income (22) (37) (47)
Other segment disclosures:      
Interest income 1 2 0
Interest expense 0 (1) 0
Capital expenditures 11 56 69
Assets 420 344  
Operating Segments | Nitrogen Fertilizer Segment      
Segment Reporting Information [Line Items]      
Net sales 525 681 836
Cost of materials and other 104 134 133
Direct operating expenses (exclusive of depreciation and amortization) 214 235 269
Selling, general and administrative expenses (exclusive of depreciation and amortization) 29 30 32
Depreciation and amortization 88 80 82
Loss on asset disposals   1 0
Operating income 90 201 320
Other segment disclosures:      
Interest income 4 6 2
Interest expense (34) (35) (36)
Capital expenditures 37 29 41
Assets 1,019 975  
Corporate And Eliminations      
Segment Reporting Information [Line Items]      
Net sales (124) (280) (197)
Other segment disclosures:      
Assets (464) 410  
Other/Eliminations      
Segment Reporting Information [Line Items]      
Net sales 0 0 0
Cost of materials and other (137) (287) (197)
Direct operating expenses (exclusive of depreciation and amortization) 1 1 0
Selling, general and administrative expenses (exclusive of depreciation and amortization) 23 19 26
Depreciation and amortization 11 9 3
Loss on asset disposals   1 0
Operating income (22) (23) (29)
Other segment disclosures:      
Interest income 11 (45) (37)
Interest expense (80) (54) (55)
Capital expenditures 5 4 7
Inter-segment fees and sales      
Segment Reporting Information [Line Items]      
Net sales (124) (280) (197)
Inter-segment fees and sales | Petroleum Segment      
Segment Reporting Information [Line Items]      
Net sales (11) (20) (17)
Inter-segment fees and sales | Renewables Segment      
Segment Reporting Information [Line Items]      
Net sales (112) (260) (180)
Inter-segment fees and sales | Nitrogen Fertilizer Segment      
Segment Reporting Information [Line Items]      
Net sales $ (1) $ 0 $ 0