Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Amortization Of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 5	$ 6
Cost of service and other
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	2	0
Cost of product
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	0	1
Operating expenses
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	5	6
Total amortization
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 7	$ 7