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Description Of Business And Summary Of Significant Accounting Policies (Acquisition-Related Intangibles and Other Long-Lived Assets) (Details) (USD $)
In Millions, unless otherwise specified
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12 Months Ended |
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Mar. 31, 2013
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Mar. 31, 2015
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| Finite-Lived Intangible Assets [Line Items] |
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| Asset Impairment Charges |
$ 39 |
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| Minimum [Member] |
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| Finite-Lived Intangible Assets [Line Items] |
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| Finite-Lived Intangible Asset, Useful Life |
|
2 years |
| Maximum [Member] |
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| Finite-Lived Intangible Assets [Line Items] |
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| Finite-Lived Intangible Asset, Useful Life |
|
14 years |
| Cost Of Revenue [Member] |
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| Finite-Lived Intangible Assets [Line Items] |
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|
| Asset Impairment Charges |
34 |
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| Amortization of intangibles [Member] |
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| Finite-Lived Intangible Assets [Line Items] |
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| Asset Impairment Charges |
$ 5 |
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| Acquisition Related Intangibles [Member] | Minimum [Member] |
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| Finite-Lived Intangible Assets [Line Items] |
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| Finite-Lived Intangible Asset, Useful Life |
|
2 years |
| Acquisition Related Intangibles [Member] | Maximum [Member] |
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| Finite-Lived Intangible Assets [Line Items] |
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| Finite-Lived Intangible Asset, Useful Life |
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14 years |