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Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]        
Increase in income tax expense $ 7,842      
Effective tax rate 27.50% 25.40% 48.60%  
Decrease in deferred tax liabilities $ 946      
Increase (decrease) in deferred tax assets (2,780)      
Loss carryforward 10,750      
Tax credit carryforward 993      
Carry forward amount of foreign tax credit with expiration dates 11,718      
Existing undistributed accumulated earnings of foreign subsidiary $ 49,200      
Percentage of impact of unrecognized tax benefits on effective tax rate if subsequently recognized 82.00%      
Unrecognized tax benefits $ 5,288 $ 5,018 $ 4,987 $ 5,070
Anticipated interest and penalty obligations (76)      
Accrued charges   (95)    
Income tax benefit expense associated with interest and penalties $ 19 $ (124) $ (3)