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Financial Instruments (Tables)
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12 Months Ended |
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Mar. 31, 2015
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| Financial Instruments [Abstract] |
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| Fair Value Of Short-Term Investments |
Short-term investments consisted of the following as of March 31, 2015 and 2014 (in millions): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As of March 31, 2015 | | As of March 31, 2014 | | Cost or Amortized Cost | | Gross Unrealized | | Fair Value | | Cost or Amortized Cost | | Gross Unrealized | | Fair Value | | Gains | | Losses | | Gains | | Losses | | Corporate bonds | $ | 467 |
| | $ | — |
| | $ | — |
| | $ | 467 |
| | $ | 279 |
| | $ | — |
| | $ | — |
| | $ | 279 |
| U.S. Treasury securities | 214 |
| | — |
| | — |
| | 214 |
| | 114 |
| | — |
| | — |
| | 114 |
| U.S. agency securities | 161 |
| | 1 |
| | — |
| | 162 |
| | 80 |
| | — |
| | — |
| | 80 |
| Commercial paper | 110 |
| | — |
| | — |
| | 110 |
| | 110 |
| | — |
| | — |
| | 110 |
| Short-term investments | $ | 952 |
| | $ | 1 |
| | $ | — |
| | $ | 953 |
| | $ | 583 |
| | $ | — |
| | $ | — |
| | $ | 583 |
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| Fair Value Of Short-Term Investments By Stated Maturity Date Schedule |
The following table summarizes the amortized cost and fair value of our short-term investments, classified by stated maturity as of March 31, 2015 and 2014 (in millions): | | | | | | | | | | | | | | | | | | As of March 31, 2015 | | As of March 31, 2014 | | Amortized Cost | | Fair Value | | Amortized Cost | | Fair Value | Short-term investments | | | | | | | | Due in 1 year or less | $ | 417 |
| | $ | 417 |
| | $ | 318 |
| | $ | 318 |
| Due in 1-2 years | 281 |
| | 281 |
| | 156 |
| | 156 |
| Due in 2-3 years | 244 |
| | 245 |
| | 104 |
| | 104 |
| Due in 3-4 years | 10 |
| | 10 |
| | 5 |
| | 5 |
| Short-term investments | $ | 952 |
| | $ | 953 |
| | $ | 583 |
| | $ | 583 |
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