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Income Taxes - Schedule of Net Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Deferred tax assets:    
Net operating loss and other carryforwards $ 1,940 $ 1,812
Property, plant and equipment, net 146 167
Reserves for environmental remediation and restoration 61 52
Obligations for pension and other employee benefits 46 42
Investments 0 0
Grantor trusts 604 603
Inventories, net 12 14
Interest 138 161
Lease liabilities 51 45
Other accrued liabilities 4 4
Intangible assets 10 5
Other 3 6
Total deferred tax assets 3,015 2,911
Valuation allowance associated with deferred tax assets (2,040) (1,951)
Net deferred tax assets 975 960
Deferred tax liabilities:    
Inventories, net (7) (7)
Property, plant and equipment, net (291) (250)
Intangible assets, net 0 0
Lease assets (50) (44)
Foreign exchange (2) (1)
Interest 0 0
Other 0 (2)
Total deferred tax liabilities (350) (304)
Net deferred tax asset 625 656
Balance sheet classifications:    
Deferred tax assets — long-term 833 830
Deferred tax liabilities — long-term (208) (174)
Net deferred tax asset $ 625 $ 656