Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Goodwill and Intangible Assets) (Details)

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Intangible Assets (Goodwill and Intangible Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill $ 421 $ 423
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 684 689
Accumulated Amortization 429 429
Net Carrying Amount 255 260
Trademarks    
Indefinite-lived Intangible Assets [Line Items]    
Unamortized Intangible Assets 683 683
Franchise agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 635 640
Accumulated Amortization 416 417
Net Carrying Amount 219 223
Management agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 33 33
Accumulated Amortization 9 8
Net Carrying Amount 24 25
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10 10
Accumulated Amortization 1 1
Net Carrying Amount 9 9
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 6 6
Accumulated Amortization 3 3
Net Carrying Amount $ 3 $ 3