Long-Term Debt And Borrowing Arrangements (Schedule Of Committed Credit Facilities) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014
Revolving Credit Facility Maturing Two Thousand Sixteen [Member]
Line of Credit Facility [Line Items]
Total Capacity	$ 1,650
Outstanding Borrowings	0
Letters of Credit Issued	784
Available Capacity	866
Other Facilities [Member]
Line of Credit Facility [Line Items]
Total Capacity	12
Outstanding Borrowings	1
Letters of Credit Issued	0
Available Capacity	$ 11