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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2025 | Jul. 09, 2025 | Jan. 27, 2025 | Jul. 31, 2024 | Apr. 11, 2024 | Dec. 21, 2023 | Oct. 06, 2023 | Jul. 31, 2023 | Mar. 06, 2023 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) |  |  |  |  |  |  |  |  |  | $ (30) | $ (12) |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) |  |  |  |  |  |  |  |  |  | $ 1 | $ (1) | $ 2
Utilities | PAPUC | 2025 Pennsylvania Public Utility Commission For Base Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  | $ 110 |  |  |  |  |  |  |  |  |
Utilities | PAPUC | Joint Petition For Approval Of Settlement | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  | $ 70 |  |  |  |  |  |  |  |  |  |
Mountaineer | WVPSC | 2024 IREP Expected |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 19 |  |  |  |  |  |  |  |
Total capital investments |  |  |  | 197 |  |  |  |  |  |  |  |
Mountaineer | WVPSC | 2024 IREP Expected | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | $ 24 |  |  |  |  |  |  |  |  |  |  |
Total capital investments | 274 |  |  |  |  |  |  |  |  |  |  |
Mountaineer | WVPSC | 2024 Infrastructure Replacement and Expansion Plan, Prior Year Under-recovery |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | 3 |  |  |  |  |  |  |  |
Mountaineer | WVPSC | 2024 Infrastructure Replacement and Expansion Plan, Prior Year Under-recovery | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | 5 |  |  |  |  |  |  |  |  |  |  |
Mountaineer | WVPSC | 2024 IREP For 2024 |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Total capital investments |  |  |  | 74 |  |  |  |  |  |  |  |
Mountaineer | WVPSC | 2024 IREP For 2024 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Total capital investments | 77 |  |  |  |  |  |  |  |  |  |  |
Mountaineer | WVPSC | 2024 IREP Recovery |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Total capital investments |  |  |  | $ 418 |  |  |  |  |  |  |  |
Mountaineer | WVPSC | 2024 IREP Recovery | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Total capital investments | $ 445 |  |  |  |  |  |  |  |  |  |  |
Mountaineer | WVPSC | 2023 IREP Recovery |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | $ 10 |  |  |  |
Total capital investments |  |  |  |  |  |  |  | 383 |  |  |  |
Mountaineer | WVPSC | 2023 Infrastructure Replacement and Expansion Plan, Capital Investments After 2022 |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | 6 |  |  |  |
Mountaineer | WVPSC | 2023 IREP |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Costs associated with capital investments |  |  |  |  |  |  |  | 131 |  |  |  |
Mountaineer | WVPSC | 2023 IREP For 2024 |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Costs associated with capital investments |  |  |  |  |  |  |  | 67 |  |  |  |
Mountaineer | WVPSC | 2023 Infrastructure Replacement and Expansion Plan, Expected |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | $ (12) |  |  |  |
Mountaineer | WVPSC | Net Revenue Increase |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  | $ 14 |  | $ 20 |  |  |
Mountaineer | WVPSC | Base Rates |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  | 38 |  |  |
Mountaineer | WVPSC | IREP rate |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  | $ (18) |  |  |
Mountaineer | WVPSC | Weather normalization adjustment rider |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |
Adjustment rider period |  |  |  |  |  | 5 years |  |  |  |  |  |
Weather deviates threshold |  |  |  |  | 2.00% |  |  |  |  |  |  |
Approved rate |  |  |  |  | 2.00% |  |  |  |  |  |  |

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