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Business Segments - Schedule of Operating Results and Capital Expenditures Information by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]                  
Net sales $ 1,944     $ 1,833     $ 5,352 $ 5,663  
Cost of materials and other 1,096     1,666     4,195 4,796  
Direct operating expenses (exclusive of depreciation and amortization) 179     165     503 502  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 42     40     115 103  
Depreciation and amortization 111     75     258 224  
Loss on asset disposals 4           4 1  
Operating income (loss) 512     (113)     277 37  
Reconciliation of Operating income (loss) to Net income:                  
Interest expense, net (25)     (18)     (79) (56)  
Other income, net 2     3     5 10  
Income tax expense (benefit) 88     (6)     (3) (14)  
Net income (loss) 401 $ (90) $ (105) (122) $ 38 $ 90 206 5  
Other segment disclosures:                  
Interest income 7     9     24 30  
Interest expense (32)     (27)     (103) (86)  
Capital expenditures 40     39     132 130  
Assets 3,992           3,992   $ 4,263
Petroleum Segment                  
Segment Reporting Information [Line Items]                  
Net sales 1,736     1,645     4,769 5,155  
Renewables Segment                  
Segment Reporting Information [Line Items]                  
Net sales 44     64     109 123  
Nitrogen Fertilizer Segment                  
Segment Reporting Information [Line Items]                  
Net sales 164     124     474 385  
Operating Segments | Petroleum Segment                  
Segment Reporting Information [Line Items]                  
Net sales 1,739     1,648     4,777 5,165  
Cost of materials and other 1,031     1,604     4,039 4,645  
Direct operating expenses (exclusive of depreciation and amortization) 113     100     306 320  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 24     23     65 57  
Depreciation and amortization 52     40     142 133  
Loss on asset disposals 1           1 1  
Operating income (loss) 518     (119)     224 9  
Other segment disclosures:                  
Interest income 4     5     14 17  
Interest expense (4)     0     (19) (1)  
Capital expenditures 25     28     98 97  
Assets 3,001           3,001   3,288
Operating Segments | Renewables Segment                  
Segment Reporting Information [Line Items]                  
Net sales 99     99     240 196  
Cost of materials and other 99     78     219 165  
Direct operating expenses (exclusive of depreciation and amortization) 9     9     23 24  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 4     3     9 7  
Depreciation and amortization 36     6     50 18  
Loss on asset disposals 2           2 0  
Operating income (loss) (51)     3     (63) (18)  
Other segment disclosures:                  
Interest income 0     0     1 0  
Interest expense 0     0     0 0  
Capital expenditures 1     0     3 10  
Assets 393           393   420
Operating Segments | Nitrogen Fertilizer Segment                  
Segment Reporting Information [Line Items]                  
Net sales 164     125     475 386  
Cost of materials and other 25     26     86 78  
Direct operating expenses (exclusive of depreciation and amortization) 58     56     173 158  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 9     7     24 21  
Depreciation and amortization 20     25     59 64  
Loss on asset disposals 1           1 0  
Operating income (loss) 51     11     132 65  
Other segment disclosures:                  
Interest income 1     1     4 3  
Interest expense (9)     (8)     (27) (25)  
Capital expenditures 14     10     30 19  
Assets 1,037           1,037   1,019
Corporate And Eliminations                  
Segment Reporting Information [Line Items]                  
Net sales (58)     (39)     (140) (84)  
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 (59)     (42)     (149) (92)  
Direct operating expenses (exclusive of depreciation and amortization) (1)     0     1 0  
Selling, general and administrative expenses (exclusive of depreciation and amortization) 5     7     17 18  
Depreciation and amortization 3     4     7 9  
Loss on asset disposals 0           0 0  
Operating income (loss) (6)     (8)     (16) (19)  
Other segment disclosures:                  
Interest income 2     3     5 10  
Interest expense (19)     (19)     (57) (60)  
Capital expenditures 0     1     1 4  
Inter-segment fees and sales                  
Segment Reporting Information [Line Items]                  
Net sales (58)     (39)     (140) (84)  
Inter-segment fees and sales | Petroleum Segment                  
Segment Reporting Information [Line Items]                  
Net sales (3)     (3)     (8) (10)  
Inter-segment fees and sales | Renewables Segment                  
Segment Reporting Information [Line Items]                  
Net sales (55)     (35)     (131) (73)  
Inter-segment fees and sales | Nitrogen Fertilizer Segment                  
Segment Reporting Information [Line Items]                  
Net sales $ 0     $ (1)     $ (1) $ (1)