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v3.23.1

Subsequent Event (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2022
Subsequent Event [Line Items] |  |  |  |  |  |
Redemptions and repurchases of power bonds |  |  | $ 1 | [1] | $ 1 |
Current regulatory assets | $ 328 |  | 328 |  |  | $ 138
Operating and maintenance | 823 | $ 767 | 1,650 |  | 1,547 |
Interest expense | 268 | $ 264 | 530 |  | $ 527 |
Non-current regulatory assets | 5,820 |  | 5,820 |  |  | 6,134
Regulatory Liability, Noncurrent | 68 |  | 68 |  |  | 172
Unrealized gains/losses on commodity derivatives |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Regulatory Liability, Noncurrent | 6 |  | 6 |  |  | 102
Unrealized gains/losses on commodity derivatives |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Current regulatory assets | 249 |  | 249 |  |  | 14
Non-current regulatory assets | $ 46 |  | $ 46 |  |  | $ 1
[1] | (1) The 2023 Series A Bonds were issued at 99.187 percent of par. (2) All redemptions were at 100 percent of par.

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