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Financial Instruments (Tables) | 12 Months Ended
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Mar. 31, 2022
Financial Instruments [Abstract] |
Fair Value Of Short-Term Investments | Short-term investments consisted of the following as of March 31, 2022 and 2021 (in millions):
| As of March 31, 2022 |  | 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 | $ | 117 |  |  | $ | — |  |  | $ | (1) |  |  | $ | 116 |  |  | $ | 372 |  |  | $ | — |  |  | $ | — |  |  | $ | 372 |
U.S. Treasury securities | 103 |  |  | — |  |  | (1) |  |  | 102 |  |  | 374 |  |  | 1 |  |  | — |  |  | 375 |
U.S. agency securities | — |  |  | — |  |  | — |  |  | — |  |  | 3 |  |  | — |  |  | — |  |  | 3 |
Commercial paper | 39 |  |  | — |  |  | — |  |  | 39 |  |  | 136 |  |  | — |  |  | — |  |  | 136 |
Foreign government securities | 17 |  |  | — |  |  | — |  |  | 17 |  |  | 67 |  |  | — |  |  | — |  |  | 67 |
Asset-backed securities | 38 |  |  | — |  |  | — |  |  | 38 |  |  | 112 |  |  | — |  |  | — |  |  | 112 |
Certificates of deposit | 18 |  |  | — |  |  | — |  |  | 18 |  |  | 41 |  |  | — |  |  | — |  |  | 41 |
Short-term investments | $ | 332 |  |  | $ | — |  |  | $ | (2) |  |  | $ | 330 |  |  | $ | 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 March 31, 2022 and 2021 (in millions):
| As of March 31, 2022 |  | As of March 31, 2021
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Short-term investments |  |  |  |  |  |  |
Due within 1 year | $ | 250 |  |  | $ | 249 |  |  | $ | 895 |  |  | $ | 896 |
Due 1 year through 5 years | 77 |  |  | 76 |  |  | 203 |  |  | 203 |
Due after 5 years | 5 |  |  | 5 |  |  | 7 |  |  | 7 |
Short-term investments | $ | 332 |  |  | $ | 330 |  |  | $ | 1,105 |  |  | $ | 1,106 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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