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Income Per Common Share (Tables)
 6 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Reconciliation of basic and diluted income per common share
The following table presents basic and diluted income per common share information for the three and six months ended September 30, 2013 and 2012:
 
Three Months Ended
September 30,
 
Six Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
 
(in millions, except per share amounts)
Basic income per common share:
 
 
 
 
 
 
 
Net income
$
240

 
$
222

 
$
575

 
$
462

Less: Net income allocable to participating securities
(2
)
 
(2
)
 
(6
)
 
(5
)
Net income allocable to common shares
$
238

 
$
220

 
$
569

 
$
457

Weighted average common shares outstanding
448

 
458

 
449

 
462

Basic income per common share
$
0.53

 
$
0.48

 
$
1.27

 
$
0.99

 
 
 
 
 
 
 
 
Diluted income per common share:
 
 
 
 
 
 
 
Net income
$
240

 
$
222

 
$
575

 
$
462

Less: Net income allocable to participating securities
(2
)
 
(2
)
 
(6
)
 
(5
)
Net income allocable to common shares
$
238

 
$
220

 
$
569

 
$
457

Weighted average shares outstanding and common share equivalents:
 
 
 
 
 
 
 
Weighted average common shares outstanding
448

 
458

 
449

 
462

Weighted average effect of share-based payment awards
2

 
1

 
1

 
1

Denominator in calculation of diluted income per share
450

 
459

 
450

 
463

Diluted income per common share
$
0.53

 
$
0.48

 
$
1.26

 
$
0.99