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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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