Financial Instruments (Schedule Of Fair Values Of Derivative Contracts Outstanding) (Details) (Fair Value, Level 2 [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Financial Instruments [Line Items]
Fair value of long-term debt	$ 4,492	$ 4,727
Fair value of long-term debt compared with carrying value	411	405
Foreign Currency [Member]
Financial Instruments [Line Items]
Fair value of derivative assets	32	18
Fair value of derivative liabilities	20	17
Commodity [Member]
Financial Instruments [Line Items]
Fair value of derivative assets	1	2
Fair value of derivative liabilities	$ 10	$ 8

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant