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Fair Value Measurements (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Mar. 31, 2020
Fair Value Disclosures [Abstract] |  |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  |  | Fair Value Measurements at Reporting Date Using |  |
| As of December 31, 2020 |  | Quoted Prices in Active Markets for Identical Financial Instruments |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  | Balance Sheet Classification
|  | (Level 1) |  | (Level 2) |  | (Level 3) |
Assets |  |  |  |  |  |  |  |  |
Bank and time deposits | $ | 136 |  |  | $ | 136 |  |  | $ | — |  |  | $ | — |  |  | Cash equivalents
Money market funds | 2,301 |  |  | 2,301 |  |  | — |  |  | — |  |  | Cash equivalents
Available-for-sale securities: |  |  |  |  |  |  |  |  |
Corporate bonds | 686 |  |  | — |  |  | 686 |  |  | — |  |  | Short-term investments and cash equivalents
U.S. Treasury securities | 570 |  |  | 570 |  |  | — |  |  | — |  |  | Short-term investments and cash equivalents
U.S. agency securities | 4 |  |  | — |  |  | 4 |  |  | — |  |  | Short-term investments
Commercial paper | 407 |  |  | — |  |  | 407 |  |  | — |  |  | Short-term investments and cash equivalents
Foreign government securities | 72 |  |  | — |  |  | 72 |  |  | — |  |  | Short-term investments
Asset-backed securities | 209 |  |  | — |  |  | 209 |  |  | — |  |  | Short-term investments
Certificates of deposit | 80 |  |  | — |  |  | 80 |  |  | — |  |  | Short-term investments and cash equivalents
Foreign currency derivatives | 22 |  |  | — |  |  | 22 |  |  | — |  |  | Other current assets and other assets
Deferred compensation plan assets (a) | 18 |  |  | 18 |  |  | — |  |  | — |  |  | Other assets
Total assets at fair value | $ | 4,505 |  |  | $ | 3,025 |  |  | $ | 1,480 |  |  | $ | — |  |  |
Liabilities |  |  |  |  |  |  |  |  |
Foreign currency derivatives | $ | 72 |  |  | $ | — |  |  | $ | 72 |  |  | $ | — |  |  | Accrued and other current liabilities and other liabilities
Deferred compensation plan liabilities (a) | 18 |  |  | 18 |  |  | — |  |  | — |  |  | Other liabilities
Total liabilities at fair value | $ | 90 |  |  | $ | 18 |  |  | $ | 72 |  |  | $ | — |  |  |
|  |  | Fair Value Measurements at Reporting Date Using |  |
| As of March 31, 2020 |  | Quoted Prices in Active Markets for Identical Financial Instruments |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  | Balance Sheet Classification
| (Level 1) |  | (Level 2) |  | (Level 3) |
Assets |  |  |  |  |  |  |  |  |
Bank and time deposits | $ | 78 |  |  | $ | 78 |  |  | $ | — |  |  | $ | — |  |  | Cash equivalents
Money market funds | 1,599 |  |  | 1,599 |  |  | — |  |  | — |  |  | Cash equivalents
Available-for-sale securities: |  |  |  |  |  |  |  |  |
Corporate bonds | 687 |  |  | — |  |  | 687 |  |  | — |  |  | Short-term investments and cash equivalents
U.S. Treasury securities | 603 |  |  | 603 |  |  | — |  |  | — |  |  | Short-term investments and cash equivalents
U.S. agency securities | 8 |  |  | — |  |  | 8 |  |  | — |  |  | Short-term investments
Commercial paper | 414 |  |  | — |  |  | 414 |  |  | — |  |  | Short-term investments and cash equivalents
Foreign government securities | 42 |  |  | — |  |  | 42 |  |  | — |  |  | Short-term investments
Asset-backed securities | 269 |  |  | — |  |  | 269 |  |  | — |  |  | Short-term investments
Certificates of deposit | 56 |  |  | — |  |  | 56 |  |  | — |  |  | Short-term investments
Foreign currency derivatives | 76 |  |  | — |  |  | 76 |  |  | — |  |  | Other current assets and other assets
Deferred compensation plan assets (a) | 13 |  |  | 13 |  |  | — |  |  | — |  |  | Other assets
Total assets at fair value | $ | 3,845 |  |  | $ | 2,293 |  |  | $ | 1,552 |  |  | $ | — |  |  |
Liabilities |  |  |  |  |  |  |  |  |
Foreign currency derivatives | $ | 36 |  |  | $ | — |  |  | $ | 36 |  |  | $ | — |  |  | Accrued and other current liabilities and other liabilities
Deferred compensation plan liabilities (a) | 14 |  |  | 14 |  |  | — |  |  | — |  |  | Other liabilities
Total liabilities at fair value | $ | 50 |  |  | $ | 14 |  |  | $ | 36 |  |  | $ | — |  |  |
(a)The Deferred Compensation Plan assets consist of various mutual funds. See Note 15 in our Annual Report on Form 10-K for the fiscal year ended March 31, 2020, for additional information regarding our Deferred Compensation Plan.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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