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Vehicle Rental Activities
 12 Months Ended
Dec. 31, 2017
Disclosure Components Of Companys Vehicles [Abstract]  
Vehicle Rental Activities
7.
Vehicle Rental Activities
The components of vehicles, net within assets under vehicle programs are as follows: 
 
As of December 31,
 
2017
 
2016
Rental vehicles
$
11,652

 
$
10,937

Less: Accumulated depreciation
(1,652
)
 
(1,454
)
 
10,000

 
9,483

Vehicles held for sale
626

 
981

Vehicles, net
$
10,626

 
$
10,464


The components of vehicle depreciation and lease charges, net are summarized below: 
 
Year Ended December 31,
 
2017
 
2016
 
2015
Depreciation expense
$
1,947

 
$
1,877

 
$
1,837

Lease charges
222

 
180

 
156

(Gain) loss on sale of vehicles, net
52

 
(10
)
 
(60
)
Vehicle depreciation and lease charges, net
$
2,221

 
$
2,047

 
$
1,933


At December 31, 2017, 2016 and 2015, the Company had payables related to vehicle purchases included in liabilities under vehicle programs - other of $346 million, $321 million and $269 million, respectively, and receivables related to vehicle sales included in assets under vehicle programs - receivables from vehicle manufacturers and other of $545 million, $520 million and $433 million, respectively.