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Effects on net income of amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ (56) | $ 14 | $ (72) | $ 25
Unrealized Gains (Losses) on Derivative Instruments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (56) | 14 | (72) | 25
Unrealized Gains (Losses) on Derivative Instruments [Member] | Research And Development [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 5 | (4) | 8 | (12)
Unrealized Gains (Losses) on Derivative Instruments [Member] | Sales |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ (61) | $ 18 | $ (80) | $ 37

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