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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative
Net revenue	$ 1,151	$ 1,348	$ 2,610	$ 2,557
Research and development	421	387	859	768
Interest and other income (expense), net	(10)	16	(13)	37
Sales Revenue, Net
Derivative
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	1	25	12	41
Research And Development [Member]
Derivative
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	(1)	(6)	(7)
Interest and Other Income (Expense), net
Derivative
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (3)	$ 1	$ (7)	$ (3)