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Financial Instruments (Tables) | 12 Months Ended
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Mar. 31, 2020
Financial Instruments [Abstract] |
Fair Value Of Short-Term Investments | Short-term investments consisted of the following as of March 31, 2020 and 2019 (in millions):
| As of March 31, 2020 |  |  |  |  |  |  |  | As of March 31, 2019 |  |  |  |  |  |
| Cost or Amortized Cost |  | Gross Unrealized |  |  |  | Fair Value |  | Cost or Amortized Cost |  | Gross Unrealized |  |  |  | Fair Value
|  |  | Gains |  | Losses |  |  |  |  |  | Gains |  | Losses |  |
Corporate bonds | $ | 684 |  |  | $ | 1 |  |  | $ | (4) |  |  | $ | 681 |  |  | $ | 325 |  |  | $ | — |  |  | $ | (1) |  |  | $ | 324 |
U.S. Treasury securities | 530 |  |  | 4 |  |  | — |  |  | 534 |  |  | 153 |  |  | — |  |  | — |  |  | 153 |
U.S. agency securities | 8 |  |  | — |  |  | — |  |  | 8 |  |  | 44 |  |  | — |  |  | — |  |  | 44 |
Commercial paper | 377 |  |  | — |  |  | — |  |  | 377 |  |  | 112 |  |  | — |  |  | — |  |  | 112 |
Foreign government securities | 42 |  |  | — |  |  | — |  |  | 42 |  |  | 50 |  |  | — |  |  | — |  |  | 50 |
Asset-backed securities | 273 |  |  | — |  |  | (4) |  |  | 269 |  |  | 53 |  |  | — |  |  | — |  |  | 53 |
Certificates of deposit | 56 |  |  | — |  |  | — |  |  | 56 |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Short-term investments | $ | 1,970 |  |  | $ | 5 |  |  | $ | (8) |  |  | $ | 1,967 |  |  | $ | 738 |  |  | $ | — |  |  | $ | (1) |  |  | $ | 737 |
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, 2020 and 2019 (in millions):
| As of March 31, 2020 |  |  |  | As of March 31, 2019 |  |
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Short-term investments |  |  |  |  |  |  |
Due within 1 year | $ | 1,568 |  |  | $ | 1,567 |  |  | $ | 449 |  |  | $ | 448 |
Due 1 year through 5 years | 395 |  |  | 393 |  |  | 287 |  |  | 287 |
Due after 5 years | 7 |  |  | 7 |  |  | 2 |  |  | 2 |
Short-term investments | $ | 1,970 |  |  | $ | 1,967 |  |  | $ | 738 |  |  | $ | 737 |

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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 http://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 http://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 http://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 http://asc.fasb.org/subtopic&trid=2176304 + Details
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