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Accumulated Other Comprehensive Income Effects on net income of amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ (166) | $ 2 | $ 25
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 1 | 0 | (1)
Unrealized Gains (Losses) on Available-for-Sale Securities | Interest and other income (expense), net |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 1 | 0 | (1)
Unrealized Gains (Losses) on Derivative Instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (167) | 2 | 26
Unrealized Gains (Losses) on Derivative Instruments | Net revenue |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (185) | 14 | 30
Unrealized Gains (Losses) on Derivative Instruments | Research and development |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 18 | $ (12) | (4)
Foreign Currency Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ 0 |  | $ 0

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