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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative
Net revenue	$ 1,826	$ 1,151	$ 3,377	$ 2,610
Research and development	553	421	1,068	859
Interest and other income (expense), net	(14)	(10)	(28)	(13)
Sales Revenue, Net
Derivative
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(18)	1	(37)	12
Research And Development [Member]
Derivative
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	4	0	12	(6)
Interest and Other Income (Expense), net
Derivative
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 4	$ (3)	$ (3)	$ (7)