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Risk Management Activities and Derivative Transactions Currency Swaps Outstanding (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) | Jun. 30, 2023 Bond_issues
Derivative |  |
Number of currency swaps outstanding | Bond_issues |  | 2
Amount of letters of credit outstanding for credit facilities | $ 6 |
Associated TVA bond issues currency exposure | $ 400 |
Minimum | 250 million Sterling currency swap |  |
Derivative |  |
Expiration date range of swaps | 2032 |
Maximum | 150 million Sterling currency swap |  |
Derivative |  |
Expiration date range of swaps | 2043 |

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