Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Future Amortization Of Acquisition-Related Intangibles) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Mar. 31, 2021
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$ 75
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	236
Finite-Lived Intangible Assets, Amortization Expense, Year Two	176
Finite-Lived Intangible Assets, Amortization Expense, Year Three	126
Finite-Lived Intangible Assets, Amortization Expense, Year Four	121
Finite-Lived Intangible Assets, Amortization Expense, Year Five	101
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	127
Finite-Lived Intangible Assets, Net	962	$ 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	$ 962