Financial Instruments (Schedule Of Derivative Instruments) (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2012 lb	Mar. 31, 2011	Mar. 31, 2012 lb	Mar. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to Earnings	$ 1,000,000	$ 27,000,000	$ (3,000,000)	$ 51,000,000
Gain (Loss) to OCI	59,000,000	2,000,000	91,000,000	45,000,000
Notional value of foreign currency hedges	1,600,000,000		1,600,000,000
Weight In Pounds Of The Copper And Aluminum Commodity Hedges Outstanding	80,000,000		80,000,000
Foreign Currency Derivatives Receiving Deferral Accounting - Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to Earnings	1,000,000	4,000,000	2,000,000	6,000,000
Gain (Loss) to OCI	2,000,000	2,000,000	6,000,000	6,000,000
Foreign Currency Derivatives Receiving Deferral Accounting - Cost Of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to Earnings	3,000,000	5,000,000	2,000,000	10,000,000
Gain (Loss) to OCI	28,000,000	3,000,000	35,000,000	10,000,000
Commodity Derivatives Receiving Deferral Accounting - Cost Of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to Earnings	(11,000,000)	18,000,000	(22,000,000)	29,000,000
Gain (Loss) to OCI	29,000,000	(3,000,000)	50,000,000	29,000,000
Foreign Currency Derivatives Not Receiving Deferral Accounting - Other Deductions, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to Earnings	$ 8,000,000	$ 0	$ 15,000,000	$ 6,000,000