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Franchising and Marketing Activities Change in the Number of Franchised and Brokerage Outlets (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
franchisedandcompanyownedoffices
Dec. 31, 2020
USD ($)
Brokerage_Offices
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
franchisedandcompanyownedoffices
Dec. 31, 2018
USD ($)
franchisedandcompanyownedoffices
Franchised (domestic and international):          
Change in Number of Franchised and Company Owned Outlets [Roll Forward]          
Beginning balance 17,776     15,830 14,039
Additions 2,109     2,399 2,149
Terminations/Closures (499)     (453) (358)
Ending balance 19,386     17,776 15,830
Company owned:          
Change in Number of Franchised and Company Owned Outlets [Roll Forward]          
Beginning balance 713     755 789
Additions 5     4 8
Terminations/Closures (45)     (46) (42)
Ending balance 673 670   713 755
Franchisee Conversion Notes and Development Advance Notes          
Change in Number of Franchised and Company Owned Outlets [Roll Forward]          
Franchise conversion and development advance notes | $ $ 155 $ 155 $ 155 $ 134  
Forgiveness of franchise conversion and development advance notes | $     $ 32 $ 29 $ 29