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Earnings Per Share (Tables)
 12 Months Ended
Mar. 31, 2017
Earnings Per Share Reconciliation [Abstract]  
Computation Of Basic Earnings And Diluted Earnings Per Share
 
Year Ended March 31,
(In millions, except per share amounts)
2017
 
2016
 
2015
Net income
$
967

 
$
1,156

 
$
875

Shares used to compute earnings per share:
 
 
 
 
 
Weighted-average common stock outstanding — basic
303

 
310

 
311

Dilutive potential common shares related to stock award plans and from assumed exercise of stock options
4

 
6

 
9

Dilutive potential common shares related to the Convertible Notes
1

 
6

 
4

Dilutive potential common shares related to the Warrants
6

 
8

 
1

Weighted-average common stock outstanding — diluted
314

 
330

 
325

Earnings per share:
 
 
 
 
 
Basic
$
3.19

 
$
3.73

 
$
2.81

Diluted
$
3.08

 
$
3.50

 
$
2.69