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Benefit Plans Contributions (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2014 Supplemental Employee Retirement Plans, Defined Benefit | Sep. 30, 2014 Other Post-retirement Benefits | Sep. 30, 2013 Other Post-retirement Benefits | Sep. 30, 2014 Pension Benefits | Sep. 30, 2013 Pension Benefits | Sep. 30, 2014 Other Pension Plans, Defined Benefit | Sep. 30, 2011 Other Pension Plans, Defined Benefit | Sep. 30, 2009 Other Pension Plans, Defined Benefit | Sep. 30, 2014 Minimum Other Pension Plans, Defined Benefit | Sep. 30, 2015 Scenario, Forecast [Member] | Sep. 30, 2015 Scenario, Forecast [Member] Supplemental Employee Retirement Plans, Defined Benefit | Sep. 30, 2015 Scenario, Forecast [Member] Other Pension Plans, Defined Benefit | Sep. 30, 2015 Scenario, Forecast [Member] Minimum Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer contributions |  | $ 6 | $ 33 | [1] | $ 47 | [1] | $ 256 | [1] | $ 6 | [1] | $ 250 | $ 270 | $ 1,000 | $ 198 |  | $ 5 | $ 275 | $ 215
Other postretirement benefit contributions | $ 47 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39 |  |  |
[1] | Other Post-Retirement Benefits Employer contributions are reduced by federal reinsurance payments and provider discounts and rebates.

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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=35743120&loc=d3e1928-114920 + Details
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- Definition The amount of cash or cash equivalents contributed during the reporting period by the entity to fund non-pension postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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