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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, 2024
Mar. 31, 2023
Mar. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]      
Net revenue $ 7,562 $ 7,426 $ 6,991
Research and development 2,420 2,328 2,186
Other Nonoperating Income (Expense) 71 (6) (48)
Net revenue      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 56 185 (14)
Research and development      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax (8) (18) 12
Interest and other income (expense), net      
Derivative Instruments, Gain (Loss) [Line Items]      
Net gains (losses) on derivative instruments $ 12 $ (29) $ 21