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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
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Jun. 30, 2026 | Jun. 30, 2025
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 | $ 1 | $ 28
(Gains) losses reclassified from accumulated other comprehensive income (loss) into income | 0 | (7)
Income tax benefit (expense) on cash flow hedges | 0 | (5)
Net change in fair value of the effective portion of designated cash flow hedges, net of tax | 1 | 16
Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpense |  |
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 | 0 | (4)
Income Statement Location [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense |  |
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 | $ 0 | $ (3)

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