Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Goodwill and Intangible Assets) (Details)

v3.10.0.1
Intangible Assets (Goodwill and Intangible Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill $ 1,532 $ 423
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,013 689
Accumulated Amortization 433 429
Net Carrying Amount 580 260
Trademarks    
Indefinite-lived Intangible Assets [Line Items]    
Unamortized Intangible Assets 1,442 683
Franchise agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 832 640
Accumulated Amortization 420 417
Net Carrying Amount 412 223
Management agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 165 33
Accumulated Amortization 8 8
Net Carrying Amount 157 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 4 3
Net Carrying Amount $ 2 $ 3