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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 2,018 $ 1,779
Less: accumulated depreciation and amortization 1,256 1,098
Property and equipment, net 762 681
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 6 6
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 33 33
Estimated useful life-in years 39 years  
Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 31 30
Estimated useful life-in years 15 years  
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 614 593
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 $ 914 822
Estimated useful life-in years 3 years  
Other Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 191 179
Estimated useful life-in years 10 years  
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 70 70
Estimated useful life-in years 7 years  
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 159 $ 46