Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Amortization Expense of Amortizable Intangible Assets) (Details)

v3.10.0.1
Intangible Assets (Amortization Expense of Amortizable Intangible Assets) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]        
Amortization expense $ 10 $ 5 $ 22 $ 15
Franchise agreements        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense 6 4 15 11
Management agreements        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense 3 1 5 2
Other        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense $ 1 $ 0 $ 2 $ 2