Income Taxes (Components Of Loss Before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Domestic	$ 204	$ 299	$ 380
Foreign	877	718	1,128
Income before provision for (benefit from) income taxes	$ 1,081	$ 1,017	$ 1,508