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Valuation and Qualifying Accounts
 12 Months Ended
Mar. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
SCHEDULE II
CA, Inc. and Subsidiaries
Valuation and Qualifying Accounts
Description
 
Balance at Beginning of Period

 
Additions/(Deductions) Charged/(Credited) to Costs and Expenses

 
Deductions(1)

 
Balance at End of Period

Allowance for doubtful accounts
(in millions)
 
 
 
 
 
 
 
 
Year ended March 31, 2013
 
$
16

 
$
9

 
$
(1
)
 
$
24

Year ended March 31, 2012
 
$
22

 
$
(1
)
 
$
(5
)
 
$
16

Year ended March 31, 2011
 
$
24

 
$
6

 
$
(8
)
 
$
22

(1)
Write-off of amounts against allowance provided