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Debt and Other Obligations Debt and Other Obligations - Secured Debt of VIEs (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018 | Aug. 09, 2013 | Jan. 17, 2012
--- | --- | --- | --- | ---
Variable Interest Entities |  |  |  |
Face Amount | $ 40 |  |  | $ 100
Debt Instrument, Interest Rate |  |  |  | 4.626%
Interest rate |  |  |  | 7.10%
Membership interests of VIE subject to mandatory redemption (including current portion) | 37 | $ 37 | $ 40 |
Long-term debt of variable interest entities (including current maturities) | 1,371 | 1,256 |  |
Secured debt of VIEs |  |  |  |
Variable Interest Entities |  |  |  |
Membership interests of VIE subject to mandatory redemption (including current portion) | 28 | 30 |  |
Long-term debt of variable interest entities (including current maturities) | $ 1,100 | $ 1,165 |  |

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