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Benefit Plans Contributions (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Other Pension Plans, Defined Benefit |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Contributions by Employer | $ 0 |
Other Post-retirement Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Contributions by Employer | $ 34 | $ 31

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- 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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Period Type: | duration

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