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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Nov. 22, 2024
Income Taxes Information [Line Items]          
Net deferred tax assets   $ 4,659 $ 3,696    
Deferred income taxes   11,426 8,813    
U.S. foreign tax credits   3,300 4,700    
US foreign tax credits expired   1,200      
Adjustment to valuation allowance   (409) (2) $ 5  
Undistributed earnings of foreign subsidiaries   5,226      
Estimated tax payable on undistributed unremitted foreign income   261      
Unrecognized tax benefits that would impact effective tax rate   368 378 701  
Unrecognized tax benefit, lapse of statute   19 224 75  
Unrecognized tax benefits, settlements   121 96 510  
Recognized federal and state tax benefit       515  
Unrecognized tax benefits, income tax penalties and interest accrued   26 45 35  
Interest and penalties (benefiting) charging earnings   19 (10) $ 12  
Certain Jurisdictions Outside Of Domestic          
Income Taxes Information [Line Items]          
Operating loss and tax credit carryforward   1,600 900    
Norwegian Tax Administration          
Income Taxes Information [Line Items]          
Adjustment to valuation allowance $ 58        
Canada Revenue Agency          
Income Taxes Information [Line Items]          
Unrecognized tax benefits, settlements     92    
Noncurrent Assets          
Income Taxes Information [Line Items]          
Net deferred tax assets   230 $ 255    
Marathon Oil Corporation          
Income Taxes Information [Line Items]          
Increase in deferred income taxes due to acquisition   2,500     $ 2,486
Operating loss carryforwards   $ 700