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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |
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Oct. 06, 2023 | Oct. 01, 2023 | Sep. 21, 2023 | Jul. 31, 2023 | Mar. 06, 2023 | Jan. 27, 2023 | Nov. 16, 2022 | Nov. 01, 2022 | Oct. 29, 2022 | Sep. 15, 2022 | Jul. 29, 2022 | Jan. 28, 2022 | Nov. 09, 2021 | Feb. 08, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 01, 2022 | Oct. 19, 2016
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years
Unrealized gain (loss) on derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,682) | $ 648 | $ 1,398 |  |
Public Service Commission of West Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Under-recovery of gas cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12 |
Public Service Commission of West Virginia | Mountaineer | 2023 Infrastructure Replacement and Expansion Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | 2023 Infrastructure Replacement and Expansion Plan, Capital Improvement 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | 131 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | 2023 Infrastructure Replacement and Expansion Plan, Capital Improvements 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | 67 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | Net Revenue Increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | $ 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | Net Revenue Increase | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | $ 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | Base Rate Case, Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | 38 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | Base Rate Case, Infrastructure Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | $ (18) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | 2022 IREP For 2023 - 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  | $ 354 |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | 2022 IREP For 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  | $ 64 |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | 2023 IREP Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  | $ 22 |  |  |  |  |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | 2021 IREP Recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | 2023 Infrastructure Replacement and Expansion Plan, Capital Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | 383 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | 2023 Infrastructure Replacement and Expansion Plan, Requested Recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Service Commission of West Virginia | Mountaineer | 2023 Infrastructure Replacement and Expansion Plan, Expected |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ (12) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  | $ 11 |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase, amount |  |  | $ 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | Regulated natural gas utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  |  | $ 83 |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | Regulated natural gas utilities | Joint Petition for Approval of Settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase, amount |  |  |  |  |  |  |  |  |  | $ 49 |  |  |  |  |  |  |  |  |
Public utilities, rate period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Approved rate increase |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net threshold |  |  |  |  |  |  |  |  |  | $ 3,368 |  |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | Regulated natural gas utilities | Joint Petition for Approval of Settlement, Phase I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase, amount |  |  |  |  |  |  |  |  | $ 38 |  |  |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | Regulated natural gas utilities | Joint Petition for Approval of Settlement, Phase II | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase, amount |  | $ 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | Regulated natural gas utilities | Weather Normalization Adjustment Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, rate period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Approved rate increase |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | UGI Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9 |  |  |  |  |
Approved rate increase, amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 6 |  |  |  |  |  |
Postretirement benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liability, amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years
Regulated natural gas utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2) | $ 5 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average remaining depreciable lives of the associated property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average remaining depreciable lives of the associated property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65 years |  |  |  |
Maximum | Removal Costs, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |

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