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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes      
Provision for income taxes $ 479 $ 676 $ 576
Undistributed earnings of foreign subsidiaries expected to be repatriated 105 111  
Undistributed earnings of foreign subsidiaries 7,800    
Operating Loss Carryforwards, Valuation Allowance 1,286    
Income tax loss carryforwards, subject to expiration 682    
Remaining amount of loss carryforwards that has no expiration date 604    
Unrecognized tax benefits that would reduce our effective tax rate if recognized 432    
Total accrued penalties and net accrued interest 24 20  
Aggregate resolution of uncertainties 210    
Income Taxes      
Income Tax, Nonrecurring capital loss from a legal entity restructuring   $ 47  
U.S. Tax Cuts and Jobs Act      
Income Taxes      
Undistributed earnings of foreign subsidiaries expected to be repatriated 800    
Undistributed earnings of foreign subsidiaries 4,400    
Undistributed earnings of foreign subsidiaries considered indefinitely reinvested 3,600    
Brazil Tax Matter [Member]      
Income Taxes      
Proposed Tax Adjustments and Penalties, Foreign Tax Authority $ 80