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Benefit Plans Contributions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	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.

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=35743120&loc=d3e1928-114920

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- Details

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X

- 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

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