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Financial Instruments (Tables) | 6 Months Ended
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Sep. 30, 2021
Financial Instruments [Abstract] |
Fair Value Of Short-Term Investments | Short-term investments consisted of the following as of September 30, 2021 and March 31, 2021 (in millions):
| As of September 30, 2021 |  | As of March 31, 2021
| Cost or Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Cost or Amortized Cost |  | Gross Unrealized |  | Fair Value
| Gains |  | Losses |  | Gains |  | Losses |
Corporate bonds | $ | 152 |  |  | $ | — |  |  | $ | — |  |  | $ | 152 |  |  | $ | 372 |  |  | $ | — |  |  | $ | — |  |  | $ | 372 |
U.S. Treasury securities | 65 |  |  | — |  |  | — |  |  | 65 |  |  | 374 |  |  | 1 |  |  | — |  |  | 375 |
U.S. agency securities | — |  |  | — |  |  | — |  |  | — |  |  | 3 |  |  | — |  |  | — |  |  | 3 |
Commercial paper | 35 |  |  | — |  |  | — |  |  | 35 |  |  | 136 |  |  | — |  |  | — |  |  | 136 |
Foreign government securities | 32 |  |  | — |  |  | — |  |  | 32 |  |  | 67 |  |  | — |  |  | — |  |  | 67 |
Asset-backed securities | 40 |  |  | — |  |  | — |  |  | 40 |  |  | 112 |  |  | — |  |  | — |  |  | 112 |
Certificates of deposit | 18 |  |  | — |  |  | — |  |  | 18 |  |  | 41 |  |  | — |  |  | — |  |  | 41 |
Short-term investments | $ | 342 |  |  | $ | — |  |  | $ | — |  |  | $ | 342 |  |  | $ | 1,105 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1,106 |
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 September 30, 2021 and March 31, 2021 (in millions):
| As of September 30, 2021 |  | As of March 31, 2021
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Short-term investments |  |  |  |  |  |  |
Due within 1 year | $ | 242 |  |  | $ | 242 |  |  | $ | 895 |  |  | $ | 896 |
Due 1 year through 5 years | 94 |  |  | 94 |  |  | 203 |  |  | 203 |
Due after 5 years | 6 |  |  | 6 |  |  | 7 |  |  | 7 |
Short-term investments | $ | 342 |  |  | $ | 342 |  |  | $ | 1,105 |  |  | $ | 1,106 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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