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Derivative Financial Instruments - Location of Gain (Loss) Recognized in Income on Derivative, Non-Designated Hedging Instruments (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]      
Net revenue $ 7,463 $ 7,562 $ 7,426
Research and development 2,569 2,420 2,328
Other Nonoperating Income (Expense) 85 71 (6)
Net revenue      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 18 56 185
Research and development      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax (11) (8) (18)
Interest and other income (expense), net      
Derivative Instruments, Gain (Loss) [Line Items]      
Net gains (losses) on derivative instruments $ 45 $ 12 $ (29)