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Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt (Summary Of The Borrowings Outstanding And Capacity Available Under The Facility) (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Debt Instrument [Line Items]  
Capacity $ 3,500
Amount Drawn/ Outstanding 922
Letters of Credit 6
Capacity Available $ 2,572