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Derivative Financial Instruments - Location of Income (Expense) Recognized in Income on Derivative, Non-Designated Hedging Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative        
Net revenue $ 1,839 $ 2,025 $ 3,510 $ 3,685
Research and development 686 648 1,392 1,277
Interest and other income (expense), net (3) 15 (1) 45
Net revenue        
Derivative        
Gains (losses) on foreign currency forward contracts designated as cash flow hedges (10) (2) (7) 5
Research and development        
Derivative        
Gains (losses) on foreign currency forward contracts designated as cash flow hedges 2 (1) 2 (3)
Interest and other income (expense), net        
Derivative        
Gains (losses) on foreign currency forward contracts not designated as hedging instruments $ (3) $ (3) $ (19) $ 3