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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,151 $ 1,054
Less: accumulated depreciation and amortization 570 587
Property and equipment, net 581 467
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 6 4
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 17 17
Estimated useful life-in years 39 years  
Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 15 14
Estimated useful life-in years 15 years  
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 491 478
Leasehold Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life-in years 1 year  
Leasehold Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life-in years 15 years  
Equipment and Computer Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 374 387
Estimated useful life-in years 3 years  
Other Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 135 56
Estimated useful life-in years 10 years  
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 62 93
Estimated useful life-in years 7 years  
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 51 $ 5