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Share-Based Compensation (Stock Option Activity) (Details 3) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding, at the beginning of the period (in shares) 6.3    
Granted (in shares) 0.5    
Exercised (in shares) (2.0)    
Outstanding, at the end of the period (in shares) 4.8 6.3  
Exercisable (in shares) 3.1    
Weighted average exercise price (in dollars per share) $ 133.75 $ 122.12  
Weighted average exercise price granted (in dollars per share) 165.44    
Weighted average exercise price exercised (in dollars per share) 105.11    
Weighted average exercise price exercisable (in dollars per share) $ 125.70    
Weighted average remaining contractual life of options outstanding 6 years 6 months 6 years 7 months 6 days  
Weighted average remaining contractual life of options exercisable 5 years 6 months    
Aggregate intrinsic value of options outstanding (in dollars) $ 290 $ 292  
Aggregate intrinsic value of options exercisable 213    
Intrinsic value of options exercised $ 139 $ 61 $ 58
Performance Shares [Member] | Franchise Advisor Deferral Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 12.5