|
Income Taxes (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Income Tax Disclosure [Abstract] | ||||
| Income tax expense | $ 88 | $ 81 | $ 248 | $ 60 |
| Net discrete tax benefit recognized | $ 6 | $ 23 | $ 184 | |
| Estimated annual effective tax rate, which excludes impact of discrete items | 29.70% | 28.80% | ||
| Expected fiscal year 2015 effective tax rate | 28.00% | |||