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Shareholders' Equity and Dividend Availability (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Apr. 30, 2021
Stockholders' Equity Note [Abstract]      
Number of authorized shares (in shares) 1,755.0    
Number of authorized shares, preferred shares (in shares) 5.0    
Number of authorized shares, voting common stock (in shares) 1,745.0    
Number of authorized shares, undesignated shares (in shares) 5.0    
Additional share repurchase authorization     $ 5,000
Number of shares repurchased (in shares) 13.9    
Cost of shares repurchased $ 2,160    
Average cost per share repurchased (in dollars per share) $ 154.79    
Remaining capacity under share repurchase authorization $ 4,010    
Cost of shares acquired to cover tax withholding costs and exercise costs $ 44 $ 47