(Schedule Of Future Amortization Of Acquisition-Related Intangibles) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$ 30
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	22
Finite-Lived Intangible Assets, Amortization Expense, Year Two	22
Finite-Lived Intangible Assets, Amortization Expense, Year Three	8
Finite-Lived Intangible Assets, Amortization Expense, Year Four	0
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	0
Acquisition-related intangibles, net	87	$ 71
Excluding In Process and Research Development [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition-related intangibles, net	$ 82