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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2013
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,
 
 
 
 
 
 
 
 
 
2013
$
40

 
$
15

 
$
10

 
$
(15
)
 
$
50

2012
21

 
27

 
—

 
(8
)
 
40

2011
16

 
9

 
—

 
(4
)
 
21

 
 
 
 
 
 
 
 
 
 
Tax Valuation Allowance:
 
 
 
 
 
 
 
 
 
Year Ended December 31,
 
 
 
 
 
 
 
 
 
2013 (a)
$
298

 
$
27

 
$
22

 
$
—

 
$
347

2012
273

 
25

 
—

 
—

 
298

2011 (a)
192

 
16

 
65

 
—

 
273

__________
(a) 
For 2013 and 2011, other adjustments relate to the acquisition of Zipcar and Avis Europe, respectively.