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Debt and Other Obligations Debt and Other Obligations - Secured Debt of VIEs (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018	Aug. 09, 2013	Jan. 17, 2012
Variable Interest Entities
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	$ 37	$ 40
Long-term debt of variable interest entities (including current maturities)	1,371	1,256
Secured debt of VIEs
Variable Interest Entities
Membership interests of VIE subject to mandatory redemption (including current portion)	28	30
Long-term debt of variable interest entities (including current maturities)	$ 1,100	$ 1,165

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- Definition

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

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

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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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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.

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