|
Stock-Based Compensation And Employee Benefit Plans (Schedule of Share Repurchases) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
|
12 Months Ended |
|
Mar. 31, 2015
|
Mar. 31, 2013
|
| Equity, Class of Treasury Stock [Line Items] |
|
|
| Stock Repurchased and Retired During Period, Value |
$ 337 |
$ 349 |
| Fiscal Year 2012 Repurchase Program [Member] |
|
|
| Equity, Class of Treasury Stock [Line Items] |
|
|
| Stock Repurchase Program, Authorized Amount |
|
500 |
| Stock Repurchased and Retired During Period, Value |
0 |
278 |
| Stock repurchased and retired during period, Shares |
0 |
22,000 |
| February 2011 Repurchase Program [Member] |
|
|
| Equity, Class of Treasury Stock [Line Items] |
|
|
| Stock Repurchased and Retired During Period, Value |
0 |
71 |
| Stock repurchased and retired during period, Shares |
0 |
4,000 |
| July 2012 Repurchase Program [Member] |
|
|
| Equity, Class of Treasury Stock [Line Items] |
|
|
| Stock Repurchase Program, Authorized Amount |
750 |
|
| Stock Repurchased and Retired During Period, Value |
337 |
|
| Stock repurchased and retired during period, Shares |
8,300 |
|
| Repurchase program, total |
|
|
| Equity, Class of Treasury Stock [Line Items] |
|
|
| Stock Repurchased and Retired During Period, Value |
$ 337 |
$ 349 |
| Stock repurchased and retired during period, Shares |
8,300 |
26,000 |