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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Schedule II – Valuation and Qualifying Accounts
(in millions)
Description
Balance at Beginning of Period
 
Expensed
 
Other Adjustments
 
Deductions
 
Balance at End of Period
Allowance for Doubtful Accounts:
 
 
 
 
 
 
 
 
 
Year Ended December 31,
 
 
 
 
 
 
 
 
 
2014 (a)
$
50

 
$
17

 
$
(3
)
 
$
(30
)
 
$
34

2013
40

 
15

 
10

 
(15
)
 
50

2012
21

 
27

 
—

 
(8
)
 
40

 
 
 
 
 
 
 
 
 
 
Tax Valuation Allowance:
 
 
 
 
 
 
 
 
 
Year Ended December 31,
 
 
 
 
 
 
 
 
 
2014 (a)
$
347

 
$
(9
)
 
$
(13
)
 
$
(6
)
 
$
319

2013 (b)
298

 
27

 
22

 
—

 
347

2012
273

 
25

 
—

 
—

 
298

__________
(a) 
Other adjustments relate to currency translation adjustments.
(b) 
Other adjustments relate to the acquisition of Zipcar.