Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Amortization Of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 5	$ 5	$ 16	$ 16
Cost of revenue
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	0	5	0	9
Operating expenses
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	5	5	16	16
Total amortization
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 5	$ 10	$ 16	$ 25