Annual report pursuant to Section 13 and 15(d)

Intangible Assets (Goodwill and Intangible Assets) (Details)

v3.10.0.1
Intangible Assets (Goodwill and Intangible Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 1,547 $ 423 $ 377
Gross Carrying Amount 1,046 689  
Accumulated Amortization 452 429  
Net Carrying Amount 594 260  
Franchise agreements      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 895 640  
Accumulated Amortization 434 417  
Net Carrying Amount 461 223  
Management agreements      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 140 33  
Accumulated Amortization 13 8  
Net Carrying Amount 127 25  
Trademarks      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 5 10  
Accumulated Amortization 1 1  
Net Carrying Amount $ 4 9  
Useful life 20 years    
Other      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 6 6  
Accumulated Amortization 4 3  
Net Carrying Amount 2 3  
Trademarks      
Finite-Lived Intangible Assets [Line Items]      
Unamortized Intangible Assets $ 1,393 $ 683  
Minimum | Franchise agreements      
Finite-Lived Intangible Assets [Line Items]      
Useful life 20 years    
Minimum | Management agreements      
Finite-Lived Intangible Assets [Line Items]      
Useful life 7 years    
Minimum | Other      
Finite-Lived Intangible Assets [Line Items]      
Useful life 3 years    
Maximum | Franchise agreements      
Finite-Lived Intangible Assets [Line Items]      
Useful life 40 years    
Maximum | Management agreements      
Finite-Lived Intangible Assets [Line Items]      
Useful life 22 years    
Maximum | Other      
Finite-Lived Intangible Assets [Line Items]      
Useful life 5 years    
Weighted Average | Franchise agreements      
Finite-Lived Intangible Assets [Line Items]      
Useful life 31 years    
Weighted Average | Management agreements      
Finite-Lived Intangible Assets [Line Items]      
Useful life 15 years    
Weighted Average | Trademarks      
Finite-Lived Intangible Assets [Line Items]      
Useful life 20 years    
Weighted Average | Other      
Finite-Lived Intangible Assets [Line Items]      
Useful life 4 years