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Benefit Plans Contributions (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Mar. 31, 2013 | Mar. 31, 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 | $ 26 | $ 20

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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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=21915506&loc=d3e1928-114920 + Details
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- Details
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