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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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