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Income Taxes - Components of Deferred Tax Liabilities and Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred Tax Liabilities        
PP&E and intangibles $ 15,609 $ 11,992    
Inventory 91 46    
Other 155 216    
Total deferred tax liabilities 15,855 12,254    
Deferred Tax Assets        
Benefit plan accruals 432 413    
Asset retirement obligations and accrued environmental costs 2,799 2,608    
Investments in joint ventures 2,269 2,133    
Other financial accruals and deferrals 497 448    
Loss and credit carryforwards 4,910 5,629    
Other 187 121    
Total deferred tax assets 11,094 11,352    
Less: valuation allowance (6,435) (7,656) $ (8,049) $ (8,342)
Total deferred tax assets net of valuation allowance 4,659 3,696    
Net deferred tax liabilities $ 11,196 $ 8,558