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Derivatives - Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) - Level 3 - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] |  |  |  |
Change in gains (losses) recognized in accumulated other comprehensive income (loss) on cash flow hedge derivatives | $ (9) | $ 29 | $ 19 | $ 25
(Gains) losses reclassified from accumulated other comprehensive income (loss) into income | (9) | (10) | (16) | (5)
Income tax benefit (expense) on cash flow hedges | 4 | (5) | (1) | (5)
Net change in fair value of the effective portion of designated cash flow hedges, net of tax | (14) | 14 | 2 | 15
Research and development |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] |  |  |  |
(Gains) losses reclassified from accumulated other comprehensive income (loss) into income | (6) | (6) | (10) | (3)
Selling, general and administrative expenses |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] |  |  |  |
(Gains) losses reclassified from accumulated other comprehensive income (loss) into income | $ (3) | $ (4) | $ (6) | $ (2)

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