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Summary of Significant Accounting Policies (Details 4) - USD ($)
$ / shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Period Within Date Of Corresponding Sales In Which Trade Receivables Are Classified As Accounts And Notes Receivable 30 days    
Other Assets $ 453 $ 431  
Accounts and notes receivable 579 656  
Allowance for doubtful accounts (45) (72)  
Accounts and notes receivable, net 534 584  
Net amounts included in Other Assets 72 68  
Allowance for doubtful accounts related to notes and direct financing lease receivables 5 1  
Stock Repurchased During Period, Value $ (250) [1] $ (810) [1] $ (2,394)
Common Stock, No Par Value $ 0 $ 0  
Prior Period Reclassification Adjustment $ 0    
Reduction to Retained earnings      
Stock Repurchased During Period, Value (179) $ (796) (2,356)
Franchise and property expenses [Member]      
Sales Allowances, Services 12 24 $ 11
Franchise advertising and other services expenses [Member] [Member]      
Sales Allowances, Services $ (7) $ 19  
Minimum [Member]      
Continuing Fees Rate 4.00%    
Maximum [Member]      
Continuing Fees Rate 6.00%    
Capitalized software costs | Minimum [Member]      
Finite-Lived Intangible Asset, Useful Life 3 years    
Capitalized software costs | Maximum [Member]      
Finite-Lived Intangible Asset, Useful Life 7 years    
[1] 2019 amount excludes and 2018 amount includes the effect of $5 million in share repurchases (0.1 million shares) with trade dates on, or prior to, December 31, 2018, but settlement dates subsequent to December 31, 2018.