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Property and Equipment, net (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment, Net
Property and equipment, net consisted of:
 
As of December 31,
 
2018
 
2017
Land
$
49

 
$
49

Buildings and leasehold improvements
625

 
626

Capitalized software
613

 
583

Furniture, fixtures and equipment
411

 
387

Projects in process
169

 
118

Buses and support vehicles
95

 
93

 
1,962

 
1,856

Less: Accumulated depreciation and amortization
(1,226
)
 
(1,152
)
Property and equipment, net
$
736

 
$
704