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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, 2022
USD ($)
franchisedandcompanyownedoffices
Dec. 31, 2022
USD ($)
Brokerage_Offices
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
franchisedandcompanyownedoffices
Dec. 31, 2020
USD ($)
franchisedandcompanyownedoffices
Franchisee Conversion Notes and Development Advance Notes          
Change in Number of Franchised and Company Owned Outlets [Roll Forward]          
Franchise conversion and development advance notes | $ $ 182 $ 182 $ 182 $ 164  
Forgiveness of franchise conversion and development advance notes | $     $ 45 $ 32 $ 32
Franchise Group          
Change in Number of Franchised and Company Owned Outlets [Roll Forward]          
Beginning balance 20,355     19,386 17,776
Additions 548     1,583 2,109
Terminations/Closures (1,079)     (614) (499)
Ending balance 19,824     20,355 19,386
Owned Brokerage Group          
Change in Number of Franchised and Company Owned Outlets [Roll Forward]          
Beginning balance 675     673 713
Additions 46     25 5
Terminations/Closures (42)     (23) (45)
Ending balance 679 680   675 673