Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Future Amortization Of Acquisition-Related Intangibles) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Mar. 31, 2021
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$ 149
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	216
Finite-Lived Intangible Assets, Amortization Expense, Year Two	165
Finite-Lived Intangible Assets, Amortization Expense, Year Three	121
Finite-Lived Intangible Assets, Amortization Expense, Year Four	115
Finite-Lived Intangible Assets, Amortization Expense, Year Five	96
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	121
Finite-Lived Intangible Assets, Net	983	$ 263
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year through after Year Five [Member]
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Net	$ 983