|
Accounting for Share-Based Compensation 2 (Details) (USD $)
In Millions, unless otherwise specified
|
9 Months Ended |
|
Dec. 31, 2014
|
| Unrecognized share-based compensation costs |
|
| Unrecognized share-based compensation costs |
$ 120 |
| Weighted average period expected to be recognized (in years) |
2 years 1 month 6 days |
| Stock Option Awards [Member] |
|
| Unrecognized share-based compensation costs |
|
| Unrecognized share-based compensation costs |
6 |
| Weighted average period expected to be recognized (in years) |
1 year 9 months 18 days |
| Restricted Stock Units [Member] |
|
| Unrecognized share-based compensation costs |
|
| Unrecognized share-based compensation costs |
19 |
| Weighted average period expected to be recognized (in years) |
2 years 0 months 0 days |
| Restricted Stock Awards [Member] |
|
| Unrecognized share-based compensation costs |
|
| Unrecognized share-based compensation costs |
69 |
| Weighted average period expected to be recognized (in years) |
2 years 1 month 6 days |
| Performance Share Units [Member] |
|
| Unrecognized share-based compensation costs |
|
| Unrecognized share-based compensation costs |
$ 26 |
| Weighted average period expected to be recognized (in years) |
2 years 7 months 6 days |