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Income from Continuing Operations Per Common Share (Tables)
 9 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Reconciliation of earnings per common share
The following table presents basic and diluted income from continuing operations per common share information for the three and nine months ended December 31, 2012 and 2011.
 
 
Three
Months Ended
December 31,
 
Nine
Months Ended
December 31,
 
2012
 
2011
 
2012
 
2011
 
(in millions, except per share amounts)
Basic income from continuing operations per common share:
 
 
 
 
 
 
 
Income from continuing operations
$
251

 
$
263

 
$
713

 
$
727

Less: Income from continuing operations allocable to participating securities
(3
)
 
(3
)
 
(8
)
 
(9
)
Income from continuing operations allocable to common shares
$
248

 
$
260

 
$
705

 
$
718

Weighted average common shares outstanding
452

 
483

 
458

 
492

Basic income from continuing operations per common share
$
0.55

 
$
0.54

 
$
1.54

 
$
1.46

Diluted income from continuing operations per common share:
 
 
 
 
 
 
 
Income from continuing operations
$
251

 
$
263

 
$
713

 
$
727

Less: Income from continuing operations allocable to participating securities
(3
)
 
(3
)
 
(8
)
 
(9
)
Income from continuing operations allocable to common shares
$
248

 
$
260

 
$
705


$
718

Weighted average shares outstanding and common share equivalents:
 
 
 
 
 
 
 
Weighted average common shares outstanding
452

 
483

 
458

 
492

Weighted average effect of share-based payment awards
1

 
1

 
2

 
1

Denominator in calculation of diluted income per share
453

 
484

 
460

 
493

Diluted income from continuing operations per common share
$
0.55

 
$
0.54

 
$
1.53

 
$
1.46