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Valuation and Qualifying Accounts
 12 Months Ended
Mar. 31, 2018
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, 2018
 
$
11

 
$
2

 
$
(3
)
 
$
10

Year Ended March 31, 2017
 
$
9

 
$
3

 
$
(1
)
 
$
11

Year Ended March 31, 2016
 
$
17

 
$
(2
)
 
$
(6
)
 
$
9

(1)
Write-off of amounts against allowance provided.