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Income Taxes - Components of Deferred Tax Liabilities and Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Liabilities        
PP&E and intangibles $ 11,992 $ 11,100    
Inventory 46 48    
Other 216 190    
Total deferred tax liabilities 12,254 11,338    
Deferred Tax Assets        
Benefit plan accruals 413 450    
Asset retirement obligations and accrued environmental costs 2,608 2,333    
Investments in joint ventures 2,133 1,917    
Other financial accruals and deferrals 448 736    
Loss and credit carryforwards 5,629 6,354    
Other 121 112    
Total deferred tax assets 11,352 11,902    
Less: valuation allowance (7,656) (8,049) $ (8,342) $ (9,965)
Total deferred tax assets net of valuation allowance 3,696 3,853    
Net deferred tax liabilities $ 8,558 $ 7,485