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Commitments and Contingencies Commitments and Contingencies - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014	Aug. 09, 2013
Debt Instrument
Membership interests of VIE subject to mandatory redemption	$ 47	$ 50	$ 40

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount that would be paid, determined under the conditions specified in the contract, if the holder of the share has the right to redeem the shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 480



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879

+ Details

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