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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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