Location of Income (Expense) Recognized in Income on Derivative, Non-Designated Hedging Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Derivative
Net revenue	$ 1,673	$ 1,593	$ 4,283	$ 4,150
Research and development	451	389	1,310	1,157
Interest and other income (expense), net	(6)	13	(19)	50
Sales Revenue, Net
Derivative
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(22)	18	(10)	59
Research And Development [Member]
Derivative
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	2	(1)	(4)	(8)
Interest and Other Income (Expense), net
Derivative
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (13)	$ (1)	$ (20)	$ (4)