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Debt and Other Obligations Debt and Other Obligations - Secured Debt of VIEs (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Aug. 09, 2013	Jan. 17, 2012
Portion at Other than Fair Value Measurement [Member]
Variable Interest Entities
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	$ 26	$ 28
Long-term debt of variable interest entities (including current maturities)	1,089	1,128
Face Amount	40			$ 100
Interest rate				7.10%
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	35	37	$ 40
Long-term debt of variable interest entities (including current maturities)	$ 1,419	$ 1,371

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

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- Definition

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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