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Accumulated other Comprehensive Income (Tables) | 12 Months Ended
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Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The changes in accumulated other comprehensive income (loss) by component, net of tax, for the fiscal years ended March 31, 2020, 2019 and 2018 are as follows (in millions):
| Unrealized Net Gains (Losses) on Available-for-Sale Securities |  | Unrealized Net Gains (Losses) on Derivative Instruments |  | Foreign Currency Translation Adjustments |  | Total
Balances as of March 31, 2017 | $ | (3) |  |  | $ | 32 |  |  | $ | (48) |  |  | $ | (19) |
Other comprehensive income (loss) before reclassifications | (9) |  |  | (126) |  |  | 28 |  |  | (107) |
Amounts reclassified from accumulated other comprehensive income (loss) | 4 |  |  | 5 |  |  | (10) |  |  | (1) |
Total other comprehensive income (loss), net of tax | (5) |  |  | (121) |  |  | 18 |  |  | (108) |
Balances as of March 31, 2018 | $ | (8) |  |  | $ | (89) |  |  | $ | (30) |  |  | $ | (127) |
Cumulative-effect adjustment from the adoption of ASC 606 | — |  |  | 22 |  |  | — |  |  | 22 |
Cumulative-effect adjustment from the adoption of ASU 2018-02 | — |  |  | 1 |  |  | — |  |  | 1 |
Balances as of April 1, 2018 | $ | (8) |  |  | $ | (66) |  |  | $ | (30) |  |  | $ | (104) |
Other comprehensive income (loss) before reclassifications | 6 |  |  | 96 |  |  | (21) |  |  | 81 |
Amounts reclassified from accumulated other comprehensive income (loss) | 1 |  |  | (8) |  |  | — |  |  | (7) |
Total other comprehensive income (loss), net of tax | 7 |  |  | 88 |  |  | (21) |  |  | 74 |
Balances as of March 31, 2019 | $ | (1) |  |  | $ | 22 |  |  | $ | (51) |  |  | $ | (30) |
Other comprehensive income (loss) before reclassifications | (1) |  |  | 79 |  |  | (34) |  |  | 44 |
Amounts reclassified from accumulated other comprehensive income (loss) | (2) |  |  | (62) |  |  | — |  |  | (64) |
Total other comprehensive income (loss), net of tax | (3) |  |  | 17 |  |  | (34) |  |  | (20) |
Balances as of March 31, 2020 | $ | (4) |  |  | $ | 39 |  |  | $ | (85) |  |  | $ | (50) |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] | The effects on net income of amounts reclassified from accumulated other comprehensive income (loss) for the fiscal years ended March 31, 2020, 2019 and 2018 were as follows (in millions):
Statement of Operations Classification |  | Amount Reclassified From Accumulated Other Comprehensive Income (Loss) |  |  |  |
|  | Year Ended March 31, |  |  |  |
|  | 2020 |  | 2019 |  | 2018
(Gains) losses on available-for-sale securities: |  |  |  |  |  |
Interest and other income (expense), net |  | $ | (2) |  |  | $ | 1 |  |  | $ | 4 |
Total, net of tax |  | (2) |  |  | 1 |  |  | 4 |
(Gains) losses on foreign currency forward contracts designated as cash flow hedges |  |  |  |  |  |
Net revenue |  | (71) |  |  | (18) |  |  | 10 |
Research and development |  |  | 9 |  |  | 10 |  |  | (5) |
Total, net of tax |  | (62) |  |  | (8) |  |  | 5 |
(Gains) losses on foreign currency translation: |  |  |  |  |  |
Interest and other income (expense), net |  | — |  |  | — |  |  | (10) |
Total, net of tax |  | — |  |  | — |  |  | (10) |
Total net (gain) loss reclassified, net of tax |  | $ | (64) |  |  | $ | (7) |  |  | $ | (1) |

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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