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Debt and Other Obligations Debt and Other Obligations - Secured Notes of SPEs (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 20, 2017 | Sep. 30, 2013 | Jan. 17, 2012 | Nov. 14, 2001
--- | --- | --- | --- | --- | ---
Secured notes |  |  |  |  |
Secured notes | $ 40 |  | $ 360 |  |
Interest rate |  |  |  | 7.10% |
Fair value of liabilities assumed |  | $ 74 |  |  |
Special purpose entity |  |  |  |  |
Secured notes |  |  |  |  |
Secured notes |  |  |  |  | $ 272
Interest rate |  |  |  |  | 5.572%

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