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Debt and Other Obligations Debt and Other Obligations - Secured Debt of VIEs (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Aug. 09, 2013	Jan. 17, 2012
Secured Debt of VIEs [Abstract]
Face Amount	$ 40			$ 100
Debt Instrument, Interest Rate				4.626%
Interest rate				7.10%
Membership interests of VIE subject to mandatory redemption (including current portion)	37	$ 41	$ 40
Long-term debt of variable interest entities (including current maturities)	$ 1,256	$ 1,356

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- Definition

Debt Instrument, Interest Rate

+ References

No definition available.

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- Definition

Secured Debt of VIEs [Abstract]

+ References

No definition available.

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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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- Definition

Amount of long-term debt classified as other.

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- 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.

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-Publisher FASB
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