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Share-Based Compensation (Tables) | 12 Months Ended
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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 |

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