Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 2,500
Unrecognized tax benefits, beginning balance	584	$ 983	$ 417
Increases in unrecognized tax benefits related to prior year tax positions	5	12	111
Decreases in unrecognized tax benefits related to prior year tax positions	(21)	(444)	(4)
Increases in unrecognized tax benefits related to current year tax positions	139	55	468
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	(50)	(2)	0
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations	(18)	(27)	(5)
Changes in unrecognized tax benefits due to foreign currency translation	(3)	7	(4)
Unrecognized tax benefits, ending balance	$ 636	$ 584	$ 983