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Debt and Other Obligations Debt and Other Obligations - Secured Debt of VIEs (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2013	Aug. 09, 2013	Sep. 30, 2012	Jan. 17, 2012
Variable Interest Entities
Face Amount	$ 40		$ 360
Interest rate						7.10%
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	19	$ 22
Long-term debt of variable interest entities (including current maturities)	927	$ 989
SCCG
Variable Interest Entities
Interest rate				3.846%
JSCCG
Variable Interest Entities
Face Amount					$ 900
Debt Instrument, Interest Rate						4.626%
Holdco
Variable Interest Entities
Face Amount					$ 100
Holdco balloon payment upon maturity	$ 10

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