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Benefit Plans Contributions (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Defined Benefit Plan Disclosure |  |  |  |
Other postretirement benefit contributions |  |  | $ 44,000,000 | $ 47,000,000
Supplemental Employee Retirement Plans, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Employer contributions |  |  | 7,000,000 | 6,000,000
Other Post-retirement Benefits |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Employer contributions | [1] |  | 43,000,000 | 33,000,000
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Employer contributions | [1] |  | 282,000,000 | 256,000,000
Other Pension Plans, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Employer contributions |  |  | 275,000,000 | 250,000,000
Minimum | Other Pension Plans, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Employer contributions |  |  | $ 215,000,000 | $ 198,000,000
Scenario, Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Other postretirement benefit contributions |  | $ 39,000,000 |  |
Scenario, Forecast [Member] | Supplemental Employee Retirement Plans, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Employer contributions |  | 6,000,000 |  |
Scenario, Forecast [Member] | Other Pension Plans, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Employer contributions |  | $ 275,000,000 |  |
[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=58740216&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=56944662&loc=d3e3536-108585 + Details
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