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Franchise Arrangements - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Franchisor Disclosure [Line Items]    
Franchise arrangement period 20 years  
Net property and equipment $ 22,448.3 $ 21,257.6
Land 5,662.2 5,465.0
Accumulated depreciation and amortization of property and equipment 14,178.1 $ 13,185.8
Franchise Arrangements    
Franchisor Disclosure [Line Items]    
Net property and equipment 16,500.0  
Land 4,800.0  
Accumulated depreciation and amortization of property and equipment $ 9,800.0