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Accumulated Other Comprehensive Income (Loss) - 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, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ (7) | $ (48) | $ (166)
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 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) | 0 | 0 | 1
Unrealized Net Gains (Losses) on Derivative Instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (7) | (48) | (167)
Unrealized Net Gains (Losses) on Derivative Instruments | Net revenue |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (18) | (56) | (185)
Unrealized Net Gains (Losses) on Derivative Instruments | Research and development |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ 11 | $ 8 | $ 18

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