Financing Arrangement (Schedule Of Interest Expense Related To Notes) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Debt Instruments [Abstract]
Amortization of debt issuance costs	$ (1)	$ (1)	$ (2)	$ (2)
Coupon interest expense	(13)	(10)	(41)	(31)
Total interest expense	$ (14)	$ (11)	$ (43)	$ (33)