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Long-Term Debt And Borrowing Arrangements (Schedule Of Committed Credit Facilities) (Detail)
$ in Millions
Jun. 30, 2017
USD ($)
Revolving Credit Facility Maturing Two Thousand Sixteen [Member]  
Line of Credit Facility [Line Items]  
Total Capacity $ 1,800
Outstanding Borrowings 0
Letters of Credit Issued 1,301
Available Capacity 499
Other Facilities [Member]  
Line of Credit Facility [Line Items]  
Total Capacity 3
Outstanding Borrowings 3
Letters of Credit Issued 0
Available Capacity $ 0