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Subsequent Event (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2023 | Aug. 01, 2022 | Sep. 30, 2021
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Redemptions and repurchases of power bonds |  |  | $ 28 | [1] | $ 1,860 |  |  |
Increase/Decrease in Interest Rate Swap Liability | $ 115 |  | 115 |  |  |  |  |
Current regulatory assets | 389 |  | 389 |  |  |  |  | $ 196
Operating and maintenance | 722 | $ 747 | 2,269 |  | 2,106 |  |  |
Interest expense | 264 | $ 267 | 791 |  | $ 824 |  |  |
Non-current regulatory assets | 7,789 |  | 7,789 |  |  |  |  | 7,956
Regulatory Liability, Noncurrent | 88 |  | 88 |  |  |  |  | 40
Commodity Contract under FHP |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Fair Value of Collateral | 10 |  | 10 |  |  |  |  |
Unrealized gains/losses on commodity derivatives |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Regulatory Liability, Noncurrent | 88 |  | 88 |  |  |  |  | 40
Unrealized gains/losses on commodity derivatives |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Current regulatory assets | 14 |  | 14 |  |  |  |  | 3
Non-current regulatory assets | $ 5 |  | $ 5 |  |  |  |  | $ 0
Forecast |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Fuel and purchased power |  |  |  |  |  | $ 4,600 |  |
Base Capital spend |  |  |  |  |  | 1,000 |  |
Operating and maintenance |  |  |  |  |  | 3,300 |  |
Interest expense |  |  |  |  |  | 1,100 |  |
Debt limit |  |  |  |  |  | $ 2,000 |  |
Forecast | Unrealized gains/losses on commodity derivatives |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Regulatory Liability, Noncurrent |  |  |  |  |  |  | $ 100 |
Forecast | DeferredDerivativeGainLossUnderFHP |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Regulatory Liability, Noncurrent |  |  |  |  |  |  | 150 |
Forecast | Unrealized gains/losses on commodity derivatives |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Non-current regulatory assets |  |  |  |  |  |  | 1 |
Forecast | DeferredDerivativeGainLossUnderFHP |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Non-current regulatory assets |  |  |  |  |  |  | $ 10 |
[1] | (1) All redemptions were at 100 percent of par.

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