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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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The proportionate share of interest (percent) in a jointly owned utility plant.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Millions			3 Months Ended	12 Months Ended
	Jan. 27, 2022	Sep. 01, 2021	Jun. 30, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Jul. 31, 2020
Business Acquisition [Line Items]
Purchase accounting adjustments				$ (5)	$ 1
Investments in equity method investees				$ 47	$ 65	$ 0
Energy Services \| Pennant
Business Acquisition [Line Items]
Ownership percent				47.00%	47.00%
Energy Services \| Pennant
Business Acquisition [Line Items]
Percentage of voting interests acquired				53.00%
Investments in equity method investees				$ 61
2021 UGI Corporation Senior Credit Facility
Business Acquisition [Line Items]
Proceeds from issuance of debt		$ 215
Sale \| HVAC business
Business Acquisition [Line Items]
Loss on disposal						$ 2
Ownership \| Sale \| Conemaugh
Business Acquisition [Line Items]
Proportionate ownership share, percent (as a percentage)							5.97%
Impairment of assets held-for-sale			$ 52
Stonehenge \| Energy Services
Business Acquisition [Line Items]
Total purchase price	$ 190
Mountaineer
Business Acquisition [Line Items]
Total purchase price		540
Liabilities incurred		$ 140
Purchase accounting adjustments				$ 5
Transaction costs					$ 13