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Financing Arrangement (Line of Credit Facility) (Details)
$ in Millions
12 Months Ended
Mar. 31, 2020
USD ($)
Line of Credit Facility [Line Items]  
Line of Credit Facility, Initiation Date Aug. 29, 2019
Line of Credit Facility, Expiration Date Aug. 29, 2024
Revolving Credit Facility [Member]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 500
Option To Request Additional Commitments On Credit Facility 500
Debt Instrument, Fee Amount $ 2
LineofCreditFacilityTerm1 5