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Share-Based Compensation (Tables)
 12 Months Ended
Mar. 31, 2015
Share-based Compensation [Abstract]  
Components Of Share-Based Compensation Expense And Related Tax Benefits
The components of share-based compensation expense and related tax benefits are as follows:
 
Years Ended March 31,
(In millions)
2015
 
2014
 
2013
Restricted stock unit awards (1)
$
137

 
$
126

 
$
132

Stock options
24

 
22

 
24

Employee stock purchase plan
13

 
12

 
11

Share-based compensation expense
174

 
160

 
167

Tax benefit for share-based compensation expense (2)
(61
)
 
(55
)
 
(59
)
Share-based compensation expense, net of tax
$
113

 
$
105

 
$
108
Schedule Of Weighted-Average Assumptions Used To Estimate The Fair Value Of Employee Stock Options
Weighted-average assumptions used to estimate the fair value of employee stock options were as follows:
 
Years Ended March 31,
 
2015
 
2014
 
2013
Expected stock price volatility
22%
 
22%
 
27%
Expected dividend yield
0.6%
 
0.7%
 
0.9%
Risk-free interest rate
1.3%
 
0.7%
 
0.8%
Expected life (in years)
4
 
4
 
5
Summary Of Options Outstanding
The following is a summary of stock options outstanding at March 31, 2015:
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise
Prices
 
Number of
Options
Outstanding
at Year End
(In millions)
 
Weighted-
Average
Remaining
Contractual
Life (Years)
 
Weighted-
Average
Exercise Price
 
Number of
Options
Exercisable at
Year End
(In millions)
 
Weighted-
Average
Exercise Price
$
40.46

–
$
133.27

 
4
 
3
 
$
79.38

 
2
 
$
68.80

133.28

–
226.05

 
1
 
6
 
182.38

 
—
 
155.87

 
 
 
 
5
 
 
 
 
 
2
 
 
Stock Option Activity
The following table summarizes stock option activity during 2015:
(In millions, except per share data)
Shares
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term (Years)
 
Aggregate
Intrinsic
Value (2)
Outstanding, March 31, 2014
6
 
$
78.07

 
4
 
$
473

Granted
1
 
184.84

 
 
 
 
Exercised
(2)
 
67.64

 
 
 
 
Outstanding, March 31, 2015
5
 
$
95.01

 
4
 
$
539

 
 
 
 
 
 
 
 
Vested and expected to vest (1)
5
 
$
95.01

 
4
 
$
538

Vested and exercisable, March 31, 2015
2
 
69.27

 
3
 
363
Data Related To Stock Option Activity
The following table provides data related to stock option activity:
 
Years Ended March 31,
(In millions, except per share data)
2015
 
2014
 
2013
Weighted-average grant date fair value per stock option
$
35.49

 
$
21.45

 
$
19.63

Aggregate intrinsic value on exercise
$
153

 
$
144

 
$
107

Cash received upon exercise
$
76

 
$
111

 
$
106

Tax benefits realized related to exercise
$
60

 
$
55

 
$
41

Total fair value of stock options vested
$
20

 
$
24

 
$
24

Total compensation cost, net of estimated forfeitures, related to unvested stock options not yet recognized, pre-tax
$
22

 
$
29

 
$
37

Weighted-average period in years over which stock option compensation cost is expected to be recognized
2

 
1

 
1
RSU Activity
The following table summarizes restricted stock unit award activity during 2015:
(In millions, except per share data)
Shares
 
Weighted-
Average
Grant Date Fair
Value Per Share
Nonvested, March 31, 2014
4
 
$
93.25

Granted
1
 
187.03

Vested
(1)
 
84.28

Nonvested, March 31, 2015
4
 
$
129.57
Data Related to RSU Activity
The following table provides data related to restricted stock unit award activity:
 
Years Ended March 31,
(In millions)
2015
 
2014
 
2013
Total fair value of shares vested
$
126

 
$
184

 
$
66

Total compensation cost, net of estimated forfeitures, related to nonvested restricted stock unit awards not yet recognized, pre-tax
$
206

 
$
236

 
$
210

Weighted-average period in years over which restricted stock unit award cost is expected to be recognized
2

 
2

 
2