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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, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ 2 | $ 25 | $ (64)
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | (1) | (2)
Unrealized Gains (Losses) on Available-for-Sale Securities | Interest Income [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | (1) | (2)
Unrealized Gains (Losses) on Derivative Instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 2 | 26 | (62)
Unrealized Gains (Losses) on Derivative Instruments | Sales Revenue, Net [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 14 | 30 | (71)
Unrealized Gains (Losses) on Derivative Instruments | Research and Development |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (12) | (4) | 9
Foreign Currency Translation Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ 0 | $ 0 | $ 0

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