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Income Per Common Share (Tables)
 6 Months Ended
Sep. 30, 2018
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, 2018 and 2017:
 
Three Months Ended
September 30,
 
Six Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions, except per share amounts)
Basic income per common share:
 
 
 
 
 
 
 
Net income
$
129

 
$
184

 
$
295

 
$
362

Less: Net income allocable to participating securities
(2
)
 
(3
)
 
(4
)
 
(5
)
Net income allocable to common shares
$
127

 
$
181

 
$
291

 
$
357

Weighted average common shares outstanding
413

 
415

 
414

 
415

Basic income per common share
$
0.31

 
$
0.44

 
$
0.70

 
$
0.86

 
 
 
 
 
 
 
 
Diluted income per common share:
 
 
 
 
 
 
 
Net income
$
129

 
$
184

 
$
295

 
$
362

Less: Net income allocable to participating securities
(2
)
 
(3
)
 
(4
)
 
(5
)
Net income allocable to common shares
$
127

 
$
181

 
$
291

 
$
357

Weighted average shares outstanding and common share equivalents:
 
 
 
 
 
 
 
Weighted average common shares outstanding
413

 
415

 
414

 
415

Weighted average effect of share-based payment awards
3

 
1

 
2

 
1

Denominator in calculation of diluted income per share
416

 
416

 
416

 
416

Diluted income per common share
$
0.31

 
$
0.44

 
$
0.70

 
$
0.86