Financial Instruments (Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value) (Details) (USD $) In Millions	Sep. 30, 2011		Sep. 30, 2010
Total Asset Derivatives	$ 5		$ 7
Total Liability Derivatives	43		44
Interest Rate Risk Management [Member] | Designated As Hedging Instrument [Member]
Total Asset Derivatives	3		5
Interest Rate Risk Management [Member] | Designated As Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets, Other assets, And Other liabilities [Member]
Total Asset Derivatives	3	[1]	5	[1]
Interest Rate Risk Management [Member] | Designated As Hedging Instrument [Member] | Other Liabilities [Member]
Total Liability Derivatives	1
Designated As Hedging Instrument [Member]
Total Liability Derivatives	1
Foreign Currency Risk Management [Member] | Not Designated As Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets And Other Assets [Member]
Total Asset Derivatives	1
Foreign Currency Risk Management [Member] | Not Designated As Hedging Instrument [Member] | Accounts Payable And Accrued Liabilities, And Other Liabilities [Member]
Total Liability Derivatives	41	[1]	42	[1]
Commodity Risk Management [Member] | Not Designated As Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets And Other Assets [Member]
Total Asset Derivatives	1	[2]	2	[2]
Total Liability Derivatives	1	[2]	2	[2]
Not Designated As Hedging Instrument [Member]
Total Asset Derivatives	2		2
Total Liability Derivatives	42		44
Interest Rate Risk Management [Member] | Other Liabilities [Member]
Interest rate contracts with right of offset	$ 3		$ 4

[1] Contracts of $3 million and $4 million presented on a gross basis in this table at September 30, 2011 and 2010, respectively, have the legal right to offset against other types of contracts with a common counterparty and, therefore, are presented on a net basis in noncurrent "Other liabilities" in the consolidated balance sheet.

[2] Contracts in an asset and liability position presented on a gross basis in this table have the legal right of offset and, therefore, are presented on a net basis in "Prepaid expenses and other current assets" and noncurrent "Other assets" in the consolidated balance sheet.