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Description Of Business And Summary Of Significant Accounting Policies (Foreign Currency Translation) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2013
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| Derivative [Line Items] | |||
| Net gain (loss) on foreign currency forward contracts | $ 59 | $ (5) | $ (2) |
| Foreign Currency Transaction Gain (Loss), Realized | (62) | 4 | 2 |
| Interest And Other Income Expense Net [Member] | |||
| Derivative [Line Items] | |||
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 58 | $ (5) | $ (2) |