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Note 5. Franchising and Marketing Activities Change in the Number of Franchised and Company Owned Outlets (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
franchisedandcompanyownedoffices
Dec. 31, 2016
USD ($)
Brokerage_Offices
Dec. 31, 2015
USD ($)
franchisedandcompanyownedoffices
Dec. 31, 2014
USD ($)
franchisedandcompanyownedoffices
Franchised:          
Change in Number of Franchised and Company Owned Outlets [Roll Forward]          
Beginning balance   12,771   12,769 13,032
Additions   847   445 311
Terminations/Closures   (304)   (443) (574)
Ending balance   13,314   12,771 12,769
Company Owned:          
Change in Number of Franchised and Company Owned Outlets [Roll Forward]          
Beginning balance   787   727 706
Additions   38   74 38
Terminations/Closures   (36)   (14) (17)
Ending balance   789 790 787 727
Franchisee Conversion Notes and Development Advance Notes [Member]          
Change in Number of Franchised and Company Owned Outlets [Roll Forward]          
Franchise conversion and development advance notes | $ $ 123 $ 123 $ 123 $ 115  
Allowance for franchise conversion and development advance notes | $ 1 $ 1 $ 1 1  
Forgiveness of franchise conversion and development advance notes | $ $ 19     $ 17 $ 15