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Note 4. Intangible Assets Amortization Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets $ 102 $ 113 $ 117
Expected amortization expense for 2018 98    
Expected amortization expense for 2019 97    
Expected amortization expense for 2020 95    
Expected amortization expense for 2021 93    
Expected amortization expense for 2022 92    
Expected amortization expense thereafter 1,085    
Amortizable—Franchise agreements (a)      
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets 67 67 67
Amortizable—License agreements (c)      
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets 1 1 1
Amortizable—Customer relationships (d)      
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets 25 28 28
Amortizable—Pendings and listings (f)      
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets 4 12 16
Amortizable—Other (g)      
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets $ 5 $ 5 $ 5