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Debt and Other Obligations Debt and Other Obligations - Debt Securities Activity (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2026 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2020 | Jul. 20, 2016 | Jan. 17, 2012
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Issues of power bonds | $ 997 | $ 0 | $ 998 |  |  |  |  |  |  |  |
Face Amount | 40 |  |  |  |  |  |  |  |  |  | $ 100
Discount on debt issues | (3) | 0 |  |  |  |  |  |  |  |  |
Redemptions/Maturities of variable interest entities | 39 | 38 | 36 |  |  |  |  |  |  |  |
Redemptions/Maturities of power bonds | 1,427 | 1,035 | 1,731 |  |  |  |  |  |  |  |
Percent of par value |  |  |  |  |  |  |  |  | 99.70% |  |
Leaseback obligation settled as a result of acquisition |  |  |  |  |  |  |  |  |  | $ 70 |
Total Current maturities of power bonds issued at par | 1,787 | 1,030 |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 7.10%
Short-term debt, net of discounts | 57 | 922 | $ 1,217 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |  |
Current maturities of long-term debt of variable interest entities issued at par | 41 | 39 |  |  |  |  |  |  |  |  |
Current maturities of notes payable | 0 | 23 |  |  |  |  |  |  |  |  |
880591EL2 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Total Current maturities of power bonds issued at par | $ 1,500 | 0 |  |  |  |  |  |  |  |  |
Interest rate | 3.875% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Feb. 15, 2021 |  |  |  |  |  |  |  |  |  |
880591DC3 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Total Current maturities of power bonds issued at par | $ 258 | 0 |  |  |  |  |  |  |  |  |
Interest rate | 5.805% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Jun. 07, 2021 |  |  |  |  |  |  |  |  |  |
880591EF5 (12.15.20) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Total Current maturities of power bonds issued at par | $ 1 | 0 |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Dec. 15, 2020 |  |  |  |  |  |  |  |  |  |
880591EF5 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Total Current maturities of power bonds issued at par | $ 0 | 1 |  |  |  |  |  |  |  |  |
Interest rate | 3.77% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Dec. 15, 2019 |  |  |  |  |  |  |  |  |  |
880591EF5 (6.15.21) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Jun. 15, 2021 |  |  |  |  |  |  |  |  |  |
880591EF5 (6/15/2018) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Total Current maturities of power bonds issued at par | $ 0 | 27 |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Jun. 15, 2020 |  |  |  |  |  |  |  |  |  |
880591EF5 (6/15/2021) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Total Current maturities of power bonds issued at par | $ 28 | 0 |  |  |  |  |  |  |  |  |
PARRS 1998 Series D Bond |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemptions/Maturities of power bonds | 23 | 0 |  |  |  |  |  |  |  |  |
PARRS 1999 Series A Bond |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemptions/Maturities of power bonds | 1,000 | 0 |  |  |  |  |  |  |  |  |
2020 Series A |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemptions/Maturities of power bonds | $ 1,000 | $ 0 |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Period, End Date | 1,489 | 1,119 |  |  |  |  |  |  |  |  |
Percent of par value | 100.00% |  |  |  |  |  |  |  |  |  |
Debt of variable interest entities |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemptions/Maturities of variable interest entities | $ 39 | $ 38 |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemptions/Maturities of notes payable | 23 | 46 |  |  |  |  |  |  |  |  |
electronotes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemptions/Maturities of power bonds | 219 | 5 |  |  |  |  |  |  |  |  |
2013 Series A [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemptions/Maturities of power bonds |  | 1,000 |  |  |  |  |  |  |  |  |
2009 Series B |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemptions/Maturities of power bonds | 28 | 30 |  |  |  |  |  |  |  |  |
1997 Series E [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemptions/Maturities of power bonds | 17 |  |  |  |  |  |  |  |  |  |
1995 Series B |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Redemptions/Maturities of power bonds | 140 | 0 |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Debt Securities Issues | $ 997 | $ 0 |  |  |  |  |  |  |  |  |

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