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Long-Term Debt And Borrowing Arrangements (Schedule Of Committed Credit Facilities) (Detail) - Revolving Credit Facility Maturing Two Thousand Sixteen [Member]
$ in Millions
Mar. 31, 2019
USD ($)
Line of Credit Facility [Line Items]  
Total Capacity $ 1,800
Outstanding Borrowings 0
Letters of Credit Issued 1,163
Available Capacity $ 637