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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.

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=58740216&loc=d3e1928-114920

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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

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