Financial Instruments (Schedule Of Derivative Instruments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to Earnings	$ (8)	$ (3)	$ (12)	$ 7
Gain (Loss) to OCI	(17)	2	(14)	(1)
Commodity Contract [Member] | Cash Flow Hedging [Member] | Other Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to OCI	(18)	(11)	(16)	(16)
Commodity Contract [Member] | Cash Flow Hedging [Member] | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified to Earnings	(2)	(1)	(5)	(4)
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of foreign currency hedge positions	1,600		1,600
Foreign Exchange Contract [Member] | Other deductions, net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to Earnings	(7)	(9)	(10)	0
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Other Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to OCI	1	13	2	15
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Sales, Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified to Earnings	1	7	3	11
Copper and Aluminum [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Copper and Aluminum Hedged	$ 234		$ 234
Weight In Pounds of Copper and Aluminum Commodity Hedges	82,000,000		82,000,000