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Financial Instruments (Tables) | 9 Months Ended
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Dec. 31, 2020
Financial Instruments [Abstract] |
Fair Value Of Short-Term Investments | Short-term investments consisted of the following as of December 31, 2020 and March 31, 2020 (in millions):
| As of December 31, 2020 |  | As of March 31, 2020
| Cost or Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Cost or Amortized Cost |  | Gross Unrealized |  | Fair Value
| Gains |  | Losses |  | Gains |  | Losses |
Corporate bonds | $ | 647 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 648 |  |  | $ | 684 |  |  | $ | 1 |  |  | $ | (4) |  |  | $ | 681 |
U.S. Treasury securities | 559 |  |  | 1 |  |  | — |  |  | 560 |  |  | 530 |  |  | 4 |  |  | — |  |  | 534 |
U.S. agency securities | 4 |  |  | — |  |  | — |  |  | 4 |  |  | 8 |  |  | — |  |  | — |  |  | 8 |
Commercial paper | 369 |  |  | — |  |  | — |  |  | 369 |  |  | 377 |  |  | — |  |  | — |  |  | 377 |
Foreign government securities | 72 |  |  | — |  |  | — |  |  | 72 |  |  | 42 |  |  | — |  |  | — |  |  | 42 |
Asset-backed securities | 208 |  |  | 1 |  |  | — |  |  | 209 |  |  | 273 |  |  | — |  |  | (4) |  |  | 269 |
Certificates of deposit | 76 |  |  | — |  |  | — |  |  | 76 |  |  | 56 |  |  | — |  |  | — |  |  | 56 |
Short-term investments | $ | 1,935 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 1,938 |  |  | $ | 1,970 |  |  | $ | 5 |  |  | $ | (8) |  |  | $ | 1,967 |
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 December 31, 2020 and March 31, 2020 (in millions):
| As of December 31, 2020 |  | As of March 31, 2020
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Short-term investments |  |  |  |  |  |  |
Due within 1 year | $ | 1,579 |  |  | $ | 1,580 |  |  | $ | 1,568 |  |  | $ | 1,567 |
Due 1 year through 5 years | 348 |  |  | 350 |  |  | 395 |  |  | 393 |
Due after 5 years | 8 |  |  | 8 |  |  | 7 |  |  | 7 |
Short-term investments | $ | 1,935 |  |  | $ | 1,938 |  |  | $ | 1,970 |  |  | $ | 1,967 |

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