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Income Per Common Share (Tables)
 3 Months Ended
Jun. 30, 2017
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 months ended June 30, 2017 and 2016:
 
Three Months Ended
June 30,
 
2017
 
2016
 
(in millions, except per share amounts)
Basic income per common share:
 
 
 
Net income
$
178

 
$
198

Less: Net income allocable to participating securities
(2
)
 
(2
)
Net income allocable to common shares
$
176

 
$
196

Weighted average common shares outstanding
415

 
414

Basic income per common share
$
0.42

 
$
0.47

 
 
 
 
Diluted income per common share:
 
 
 
Net income
$
178

 
$
198

Less: Net income allocable to participating securities
(2
)
 
(2
)
Net income allocable to common shares
$
176

 
$
196

Weighted average shares outstanding and common share equivalents:
 
 
 
Weighted average common shares outstanding
415

 
414

Weighted average effect of share-based payment awards
2

 
1

Denominator in calculation of diluted income per share
417

 
415

Diluted income per common share
$
0.42

 
$
0.47