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Note 4. Intangible Assets Amortization Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets $ 113 $ 117 $ 116
Expected amortization expense for 2017 99    
Expected amortization expense for 2018 97    
Expected amortization expense for 2019 96    
Expected amortization expense for 2020 94    
Expected amortization expense for 2021 92    
Expected amortization expense thereafter 1,178    
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 28 28 37
Amortizable—Pendings and listings (f)      
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets 12 16 8
Amortizable—Other (g)      
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets $ 5 $ 5 $ 3