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Income Taxes - Components of Deferred Tax Liabilities and Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Liabilities        
PP&E and intangibles $ 11,100 $ 10,170    
Inventory 48 44    
Other 190 213    
Total deferred tax liabilities 11,338 10,427    
Deferred Tax Assets        
Benefit plan accruals 450 321    
Asset retirement obligations and accrued environmental costs 2,333 2,297    
Investments in joint ventures 1,917 1,684    
Other financial accruals and deferrals 736 827    
Loss and credit carryforwards 6,354 7,402    
Other 112 399    
Total deferred tax assets 11,902 12,930    
Less: valuation allowance (8,049) (8,342) $ (9,965) $ (10,214)
Total deferred tax assets net of valuation allowance 3,853 4,588    
Net deferred tax liabilities $ 7,485 $ 5,839