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Derivative Financial Instruments (Tables) | 12 Months Ended
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Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions | Total gross notional amounts and fair values for currency derivatives with cash flow hedge accounting designation are as follows (in millions):
| As of March 31, 2020 |  |  |  |  |  | As of March 31, 2019 |  |  |  |
| Notional Amount |  | Fair Value |  |  |  | Notional Amount |  | Fair Value |  |
|  |  | Asset |  | Liability |  |  |  | Asset |  | Liability
Forward contracts to purchase | $ | 316 |  |  | $ | 1 |  |  | $ | 19 |  |  | $ | 295 |  |  | $ | — |  |  | $ | 10 |
Forward contracts to sell | $ | 1,371 |  |  | $ | 61 |  |  | $ | 1 |  |  | $ | 1,355 |  |  | $ | 31 |  |  | $ | 4 |
Total gross notional amounts and fair values for currency derivatives that are not designated as hedging instruments are accounted for as follows (in millions):
| As of March 31, 2020 |  |  |  |  |  | As of March 31, 2019 |  |  |  |
| Notional Amount |  | Fair Value |  |  |  | Notional Amount |  | Fair Value |  |
|  |  | Asset |  | Liability |  |  |  | Asset |  | Liability
Forward contracts to purchase | $ | 388 |  |  | $ | 1 |  |  | $ | 16 |  |  | $ | 449 |  |  | $ | — |  |  | $ | 2 |
Forward contracts to sell | $ | 292 |  |  | $ | 13 |  |  | $ | — |  |  | $ | 394 |  |  | $ | 2 |  |  | $ | — |
Derivative Instruments, Gain (Loss) |
| Amount of Gain (Loss) Recognized in the Statements of Operations |  |  |  |  |  |  |  |  |  |
| Year Ended March 31, |  |  |  |  |  |  |  |  |  |
| 2020 |  |  |  | 2019 |  |  |  | 2018 |  |
| Net revenue |  | Research and development |  | Net revenue |  | Research and development |  | Net revenue |  | Research and development
Total amounts presented in our Consolidated Statements of Operations in which the effects of cash flow hedges are recorded | $ | 5,537 |  |  | $ | 1,559 |  |  | $ | 4,950 |  |  | $ | 1,433 |  |  | $ | 5,150 |  |  |  | $ | 1,320 |
Gains (losses) on foreign currency forward contracts designated as cash flow hedges | $ | 71 |  |  | $ | (9) |  |  | $ | 18 |  |  | $ | (10) |  |  | $ | (10) |  |  |  | $ | 5 |
The effect of foreign currency forward contracts not designated as hedging instruments in our Consolidated Statements of Operations for the fiscal years ended March 31, 2020, 2019 and 2018, was as follows (in millions):
|  | Amount of Gain (Loss) Recognized in the Statements of Operations |  |  |  |
|  | Year Ended March 31, |  |  |  |
|  | 2020 |  | 2019 |  | 2018
|  | Interest and other income (expense), net |  |  |  |
Total amounts presented in our Consolidated Statements of Operations in which the effects of balance sheet hedges are recorded |  | $ | 63 |  |  | $ | 83 |  |  | $ | 15 |
Gain (losses) on foreign currency forward contracts not designated as hedging instruments |  | $ | (4) |  |  | $ | 25 |  |  | $ | (26) |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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