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Benefit Plans Contributions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014 Supplemental Employee Retirement Plans, Defined Benefit	Sep. 30, 2013 Supplemental Employee Retirement Plans, Defined Benefit	Sep. 30, 2014 Other Post-retirement Benefits	Sep. 30, 2013 Other Post-retirement Benefits	Sep. 30, 2012 Other Post-retirement Benefits	Sep. 30, 2013 Pension Benefits	Sep. 30, 2012 Pension Benefits	Sep. 30, 2014 Other Pension Plans, Defined Benefit	Sep. 30, 2009 Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Employer contributions	$ 6	$ 6	$ 40	$ 47	$ 41	$ 6	$ 8	$ 250	$ 1,000

X

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration