Financing Arrangement (Schedule Of Interest Expense Related To Notes) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Financing Arrangement [Line Items]
Amortization of debt discount	$ (1)	$ 0	$ 0
Amortization of debt issuance costs	(2)	(2)	(2)
Coupon interest expense	(55)	(43)	(42)
Total interest expense	$ (58)	$ (45)	$ (44)