Financial Instruments (Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Sep. 30, 2011
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	$ 5		$ 5
Total Liability Derivatives	37		43
Other Liabilities [Member] | Interest Rate Risk Management [Member]
Derivatives, Fair Value [Line Items]
Interest rate contracts with right of offset	2		3
Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total Liability Derivatives			1
Designated As Hedging Instrument [Member] | Interest Rate Risk Management [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	2		3
Designated As Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets And Other Liabilities [Member] | Interest Rate Risk Management [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	2	[1]	3	[1]
Designated As Hedging Instrument [Member] | Accounts Payable And Accrued Liabilities [Member] | Foreign Currency Risk Management [Member]
Derivatives, Fair Value [Line Items]
Total Liability Derivatives			1
Not Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	3		2
Total Liability Derivatives	37		42
Not Designated As Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets [Member] | Foreign Currency Risk Management [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	2		1
Not Designated As Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets [Member] | Commodity Risk Management [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	1	[2]	1	[2]
Total Liability Derivatives	1	[2]	1	[2]
Not Designated As Hedging Instrument [Member] | Accounts Payable And Accrued Liabilities, And Other Liabilities [Member] | Foreign Currency Risk Management [Member]
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	$ 36	[1]	$ 41	[1]

[1] Contracts of $2 million and $3 million presented on a gross basis in this table at March 31, 2012 and September 30, 2011, 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" in the Consolidated Balance Sheet.