Retirement Plans (Reconciliation Of Change In Value For Level 3 Assets) (Details) (Fair Value, Level 3 [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 30, 2013	Sep. 30, 2012
Fair Value, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 250	$ 267
Gains (Losses) on assets held	25	9
Gains (Losses) on assets sold	(22)	(16)
Purchases, sales and settlements, net	(3)	(10)
Ending balance	$ 250	$ 250

Fair value measurement with unobservable inputs reconciliation recurring basis asset gains losses on assets held.

No definition available.

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Period Type:	duration

- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset gains losses on assets sold.

+ References

No definition available.

+ Details

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- Details

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- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph c

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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