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Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Summary Of The Borrowings Outstanding And Capacity Available Under The Facility) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Summary of the borrowings outstanding and capacity available under the facility  
Line of credit facility, maximum borrowing capacity $ 3,500
Amount Drawn/ Outstanding 210
Letters of Credit 6
Capacity Available $ 3,284