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Debt and Other Obligations Debt and Other Obligations - Secured Notes of SPEs (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2013 | Jan. 17, 2012
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Secured notes |  |  |
Secured notes | $ 40 | $ 360 |
Interest rate |  |  | 7.10%

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