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Financial Instruments | 9 Months Ended
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Dec. 31, 2020
Financial Instruments [Abstract] |
Financial Instruments | (3) FINANCIAL INSTRUMENTS Cash and Cash Equivalents As of December 31, 2020 and March 31, 2020, our cash and cash equivalents were $4,772 million and $3,768 million, respectively. Cash equivalents were valued using quoted market prices or other readily available market information. 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 |
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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- Definition FINANCIAL INSTRUMENTS [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for financial instruments. This disclosure includes, but is not limited to, fair value measurements of short and long term marketable securities, international currencies forward contracts, and auction rate securities. Financial instruments may include hedging and non-hedging currency exchange instruments, derivatives, securitizations and securities available for sale at fair value. Also included are investment results, realized and unrealized gains and losses as well as impairments and risk management disclosures. + References No definition available. + Details
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