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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2025 | Jul. 09, 2025 | Jan. 27, 2025 | Oct. 01, 2024 | Jul. 31, 2024 | Oct. 06, 2023 | Sep. 21, 2023 | Jul. 31, 2023 | Mar. 06, 2023 | Jan. 27, 2023 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Oct. 19, 2016
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years
Unrealized gain (loss) on derivatives |  |  |  |  |  |  |  |  |  |  | $ (19) | $ (10) | $ (1,682) |
Pennsylvania Public Utility Commission | UGI Utilities, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  | $ 11 |  |  |  |
Approved rate increase, amount |  |  |  |  |  |  | $ 9 |  |  |  |  |  |  |
2025 Infrastructure Replacement And Expansion Plan Expected | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | $ 24 |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investments increase (decrease) | 274 |  |  |  |  |  |  |  |  |  |  |  |  |
2025 Infrastructure Replacement and Expansion Plan, Prior Year Under-recovery | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | 5 |  |  |  |  |  |  |  |  |  |  |  |  |
2025 Infrastructure Replacement and Expansion Plan, Capital Investments 2026 | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investments increase (decrease) | 77 |  |  |  |  |  |  |  |  |  |  |  |  |
2025 Infrastructure Replacement and Expansion Plan, Capital Improvements 2026 Through 2030 | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investments increase (decrease) | $ 445 |  |  |  |  |  |  |  |  |  |  |  |  |
2024 Infrastructure Replacement And Expansion Plan Expected | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | $ 19 |  |  |  |  |  |  |  |  |
Capital investments increase (decrease) |  |  |  |  | 197 |  |  |  |  |  |  |  |  |
2024 Infrastructure Replacement and Expansion Plan, Prior Year Under-recovery | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
2024 Infrastructure Replacement and Expansion Plan, Capital Investments 2025 | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investments increase (decrease) |  |  |  |  | 74 |  |  |  |  |  |  |  |  |
2024 Infrastructure Replacement and Expansion Plan, Capital Improvements 2025 Through 2029 | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investments increase (decrease) |  |  |  |  | $ 418 |  |  |  |  |  |  |  |  |
2023 Infrastructure Replacement and Expansion Plan | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | $ 10 |  |  |  |  |  |
2023 Infrastructure Replacement and Expansion Plan, Requested Recovery | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | 6 |  |  |  |  |  |
2023 Infrastructure Replacement and Expansion Plan, Capital Improvement 2023 | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs associated with capital investments |  |  |  |  |  |  |  | 131 |  |  |  |  |  |
2023 Infrastructure Replacement and Expansion Plan, Capital Improvements 2024 | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs associated with capital investments |  |  |  |  |  |  |  | 67 |  |  |  |  |  |
2023 Infrastructure Replacement and Expansion Plan, Expected | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investments increase (decrease) |  |  |  |  |  |  |  | (12) |  |  |  |  |  |
2023 Infrastructure Replacement and Expansion Plan, Capital Investments | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | $ 383 |  |  |  |  |  |
Net Revenue Increase | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  | $ 14 |  |  | $ 20 |  |  |  |  |
Base Rate Case, Base Rate | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  | 38 |  |  |  |  |
Base Rate Case, Infrastructure Rider | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  | $ (18) |  |  |  |  |
Weather Normalization Adjustment Rider | Public Service Commission of West Virginia | Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, rate matters, approved period |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Public utilities, approved rate increase (decrease), percentage threshold |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |
2025 Pennsylvania Public Utility Commission For Base Operating Revenues | Pennsylvania Public Utility Commission | UGI Utilities, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  | $ 110 |  |  |  |  |  |  |  |  |  |  |
Joint Petition for Approval of Settlement | Pennsylvania Public Utility Commission | UGI Utilities, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  | $ 70 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  | $ (5) | $ 2 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average remaining depreciable lives of associated property |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average remaining depreciable lives of associated property |  |  |  |  |  |  |  |  |  |  | 65 years |  |  |
Maximum | Removal Costs, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |

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