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Financing Arrangement (Schedule Of Interest Expense Related To Notes) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Debt Instruments [Abstract]        
Amortization of debt issuance costs $ 0 $ 0 $ (1) $ (1)
Coupon interest expense (11) (11) (21) (21)
Total interest expense $ (11) $ (11) $ (22) $ (22)