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Note 4. Intangible Assets Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount of indefinite-lived intangible assets $ 766  
Gross carrying amount of total other intangibles 652 $ 620
Accumulated Amortization 339 304
Net carrying amount of finite-lived and indefinite-lived intangible assets 313 316
Unamortizable—Trademarks (b)    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount of indefinite-lived intangible assets 748 745
Unamortizable—Title plant shares (e)    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount of indefinite-lived intangible assets 18 11
Amortizable—Franchise agreements (a)    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 2,019 2,019
Accumulated Amortization 658 591
Net carrying amount of finite-lived intangible assets $ 1,361 1,428
Amortization period 30 years  
Amortizable—License agreements (c)    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 45 45
Accumulated Amortization 9 8
Net carrying amount of finite-lived intangible assets $ 36 37
Amortization period 50 years  
Amortizable—Customer relationships (d)    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 550 530
Accumulated Amortization 312 284
Net carrying amount of finite-lived intangible assets 238 246
Amortizable—Pendings and listings (f)    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 6 3
Accumulated Amortization 5 1
Net carrying amount of finite-lived intangible assets $ 1 2
Amortization period 5 months  
Amortizable—Other (g)    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 33 31
Accumulated Amortization 13 11
Net carrying amount of finite-lived intangible assets $ 20 $ 20
Maximum [Member] | Amortizable—Customer relationships (d)    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 20 years  
Maximum [Member] | Amortizable—Other (g)    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 10 years  
Minimum [Member] | Amortizable—Customer relationships (d)    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 2 years  
Minimum [Member] | Amortizable—Other (g)    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 5 years