Summary of Significant Accounting Policies (Policies)	6 Months Ended
Mar. 31, 2023
Accounting Policies [Abstract]
Restricted Cash	Restricted Cash. Restricted cash principally represents those cash balances in our commodity futures brokerage accounts that are restricted from withdrawal.
Earnings Per Common Share	Earnings Per Common Share. Basic earnings per share attributable to UGI stockholders reflect the weighted-average number of common shares outstanding. Diluted earnings per share attributable to UGI stockholders include the effects of dilutive stock options, common stock awards and Equity Units.
Equity Method Investments	Equity Method Investments. We account for privately held equity securities of entities without readily determinable fair values in which we do not have control, but have significant influence over operating and financial policies, under the equity method. These are included in "Other assets" on the Condensed Consolidated Balance Sheets. Equity method earnings are included in "Income from equity method investees" on the Condensed Consolidated Statements of Income. Our equity method investments primarily comprise MBL Bioenergy, Pine Run and other equity method investments in biomass and other renewable energy projects. MBL Bioenergy. The Company has an approximate 99.99% interest in MBL Bioenergy, a company jointly owned by UGI Dakota, LLC, Sevana Bioenergy and a subsidiary of California Bioenergy. The sole purpose of MBL Bioenergy is the development of RNG projects in South Dakota comprising three dairy waste anaerobic digester systems. MBL Bioenergy is a variable interest entity whereby the Company has determined that it is not the primary beneficiary since it does not direct the activities that most significantly impact the entity’s economic performance. The carrying value of our investment in MBL Bioenergy at March 31, 2023 and 2022 was $78 and $0, respectively. Pine Run. The Company has an approximately 49% interest in Pine Run, a company jointly owned by Stonehenge Energy Resources and UGI Pine Run LLC. Pine Run owns Pine Run Midstream which operates dry gas gathering pipelines and compression assets in western Pennsylvania. The carrying value of our investment in Pine Run at March 31, 2023 and 2022 was $72 and $65, respectively. Pennant. At March 31, 2022, the carrying value of our investment in Pennant was $97. During Fiscal 2022, UGI through Energy Services, completed the Pennant Acquisition in which Energy Services acquired the remaining 53% of the equity interests in Pennant. The acquisition of the remaining interests was accounted for as an acquisition of assets, and the purchase price of approximately $61 was primarily allocated to property, plant and equipment. Other Equity Method Investments. Our other equity method investments totaled $69 and $26 at March 31, 2023 and 2022, respectively, and principally comprise of a number of investments in biomass and other renewable energy projects at Midstream & Marketing and a renewable energy joint venture at UGI International. Our maximum exposure to loss related to these investments is limited to the amount invested.
Derivative Instruments	Derivative Instruments. Derivative instruments are reported on the Condensed Consolidated Balance Sheets at their fair values, unless the NPNS exception is elected. The accounting for changes in fair value depends upon the purpose of the derivative instrument, whether it is subject to regulatory ratemaking mechanisms or if it qualifies and is designated as a hedge for accounting purposes. Certain of our derivative instruments qualify and are designated as cash flow hedges. For cash flow hedges, changes in the fair values of the derivative instruments are recorded in AOCI, to the extent effective at offsetting changes in the hedged item, until earnings are affected by the hedged item. We discontinue cash flow hedge accounting if occurrence of the forecasted transaction is determined to be no longer probable. Hedge accounting is also discontinued for derivatives that cease to be highly effective. We do not designate our commodity and certain foreign currency derivative instruments as hedges under GAAP. Changes in the fair values of these derivative instruments are reflected in net income. Gains and losses on substantially all of the commodity derivative instruments used by Utilities are included in regulatory assets or liabilities because it is probable such gains or losses will be recoverable from, or refundable to, customers. From time to time, we also enter into net investment hedges. Gains and losses on net investment hedges that relate to our foreign operations are included in the cumulative translation adjustment component in AOCI until such foreign net investment is substantially sold or liquidated. Cash flows from derivative instruments, other than certain cross-currency swaps and net investment hedges, if any, are included in cash flows from operating activities on the Condensed Consolidated Statements of Cash Flows. Cash flows from the interest portion of our cross-currency hedges, if any, are included in cash flows from operating activities while cash flows from the currency portion of such hedges, if any, are included in cash flows from financing activities. Cash flows from net investment hedges, if any, are included in cash flows from investing activities on the Condensed Consolidated Statements of Cash Flows.
Use of Estimates	Use of Estimates. The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and costs. These estimates are based on management’s knowledge of current events, historical experience and various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results may be different from these estimates and assumptions.
Goodwill	Goodwill. We do not amortize goodwill, but test it at least annually for impairment at the reporting unit level. A reporting unit is an operating segment, or one level below an operating segment (a component) if it constitutes a business for which discrete financial information is available and regularly reviewed by segment management. Components are aggregated into a single reporting unit if they have similar economic characteristics. Each of our reporting units with goodwill is required to perform impairment tests annually or whenever events or circumstances indicate that the value of goodwill may be impaired.
New Accounting Standard Adopted	New Accounting Standard Adopted in Fiscal 2023 Debt and Derivatives and Hedging. Effective October 1, 2022, the Company adopted ASU 2020-06, “Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40).” The amendments in this ASU affect entities that issue convertible instruments and/or contracts indexed to and potentially settled in an entity’s own equity. This ASU reduces the number of accounting models for convertible debt instruments and convertible preferred stock, expands disclosure requirements for convertible instruments, and simplifies the related earnings per share guidance. We adopted this ASU using the modified retrospective transition method and applied the new guidance to applicable features of our Equity Units. Periods prior to October 1, 2022 have not been restated. Upon adoption, we reclassified $6 from Common Stock to Preferred Stock associated with the previously separated equity-classified beneficial conversion feature, which was accounted for as a deemed dividend. The increase to Preferred Stock was partially offset by an increase of $1 to opening retained earnings for the previously recognized non-cash amortization of the beneficial conversion feature. The ASU 2020-06 also removes the presumption of cash settlement for contracts that may be settled in cash or shares. In accordance with the new guidance, we included the dilutive impact of the quarterly contract adjustment payment liability associated with the 2024 Purchase Contracts, which may be settled in cash or shares, in our computation of weighted average diluted common shares outstanding. The adoption of the new guidance did not, and is not expected to, have a material impact on our consolidated financial statements.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Mar. 31, 2023

Restricted Cash. Restricted cash principally represents those cash balances in our commodity futures brokerage accounts that are restricted from withdrawal.

Earnings Per Common Share

Earnings Per Common Share. Basic earnings per share attributable to UGI stockholders reflect the weighted-average number of common shares outstanding. Diluted earnings per share attributable to UGI stockholders include the effects of dilutive stock options, common stock awards and Equity Units.

Equity Method Investments

Equity Method Investments. We account for privately held equity securities of entities without readily determinable fair values in which we do not have control, but have significant influence over operating and financial policies, under the equity method. These are included in "Other assets" on the Condensed Consolidated Balance Sheets. Equity method earnings are included in "Income from equity method investees" on the Condensed Consolidated Statements of Income. Our equity method investments primarily comprise MBL Bioenergy, Pine Run and other equity method investments in biomass and other renewable energy projects.

MBL Bioenergy. The Company has an approximate 99.99% interest in MBL Bioenergy, a company jointly owned by UGI Dakota, LLC, Sevana Bioenergy and a subsidiary of California Bioenergy. The sole purpose of MBL Bioenergy is the development of RNG projects in South Dakota comprising three dairy waste anaerobic digester systems. MBL Bioenergy is a variable interest entity whereby the Company has determined that it is not the primary beneficiary since it does not direct the activities that most significantly impact the entity’s economic performance. The carrying value of our investment in MBL Bioenergy at March 31, 2023 and 2022 was $78 and $0, respectively.

Pine Run. The Company has an approximately 49% interest in Pine Run, a company jointly owned by Stonehenge Energy Resources and UGI Pine Run LLC. Pine Run owns Pine Run Midstream which operates dry gas gathering pipelines and compression assets in western Pennsylvania. The carrying value of our investment in Pine Run at March 31, 2023 and 2022 was $72 and $65, respectively.

Pennant. At March 31, 2022, the carrying value of our investment in Pennant was $97. During Fiscal 2022, UGI through Energy Services, completed the Pennant Acquisition in which Energy Services acquired the remaining 53% of the equity interests in Pennant. The acquisition of the remaining interests was accounted for as an acquisition of assets, and the purchase price of approximately $61 was primarily allocated to property, plant and equipment.

Other Equity Method Investments. Our other equity method investments totaled $69 and $26 at March 31, 2023 and 2022, respectively, and principally comprise of a number of investments in biomass and other renewable energy projects at Midstream & Marketing and a renewable energy joint venture at UGI International. Our maximum exposure to loss related to these investments is limited to the amount invested.

Derivative Instruments

Derivative Instruments. Derivative instruments are reported on the Condensed Consolidated Balance Sheets at their fair values, unless the NPNS exception is elected. The accounting for changes in fair value depends upon the purpose of the derivative instrument, whether it is subject to regulatory ratemaking mechanisms or if it qualifies and is designated as a hedge for accounting purposes.

Certain of our derivative instruments qualify and are designated as cash flow hedges. For cash flow hedges, changes in the fair values of the derivative instruments are recorded in AOCI, to the extent effective at offsetting changes in the hedged item, until earnings are affected by the hedged item. We discontinue cash flow hedge accounting if occurrence of the forecasted transaction is determined to be no longer probable. Hedge accounting is also discontinued for derivatives that cease to be highly effective. We do not designate our commodity and certain foreign currency derivative instruments as hedges under GAAP. Changes in the fair values of these derivative instruments are reflected in net income. Gains and losses on substantially all of the commodity derivative instruments used by Utilities are included in regulatory assets or liabilities because it is probable such gains or losses will be recoverable from, or refundable to, customers. From time to time, we also enter into net investment hedges. Gains and losses on net investment hedges that relate to our foreign operations are included in the cumulative translation adjustment component in AOCI until such foreign net investment is substantially sold or liquidated.

Cash flows from derivative instruments, other than certain cross-currency swaps and net investment hedges, if any, are included in cash flows from operating activities on the Condensed Consolidated Statements of Cash Flows. Cash flows from the interest portion of our cross-currency hedges, if any, are included in cash flows from operating activities while cash flows from the currency portion of such hedges, if any, are included in cash flows from financing activities. Cash flows from net investment hedges, if any, are included in cash flows from investing activities on the Condensed Consolidated Statements of Cash Flows.

Use of Estimates

Use of Estimates. The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and costs. These estimates are based on management’s knowledge of current events, historical experience and various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results may be different from these estimates and assumptions.

Goodwill

Goodwill. We do not amortize goodwill, but test it at least annually for impairment at the reporting unit level. A reporting unit is an operating segment, or one level below an operating segment (a component) if it constitutes a business for which discrete financial information is available and regularly reviewed by segment management. Components are aggregated into a single reporting unit if they have similar economic characteristics. Each of our reporting units with goodwill is required to perform impairment tests annually or whenever events or circumstances indicate that the value of goodwill may be impaired.

New Accounting Standard Adopted

New Accounting Standard Adopted in Fiscal 2023

Debt and Derivatives and Hedging. Effective October 1, 2022, the Company adopted ASU 2020-06, “Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40).” The amendments in this ASU affect entities that issue convertible instruments and/or contracts indexed to and potentially settled in an entity’s own equity. This ASU reduces the number of accounting models for convertible debt instruments and convertible preferred stock, expands disclosure requirements for convertible instruments, and simplifies the

related earnings per share guidance. We adopted this ASU using the modified retrospective transition method and applied the new guidance to applicable features of our Equity Units. Periods prior to October 1, 2022 have not been restated.

Upon adoption, we reclassified $6 from Common Stock to Preferred Stock associated with the previously separated equity-classified beneficial conversion feature, which was accounted for as a deemed dividend. The increase to Preferred Stock was partially offset by an increase of $1 to opening retained earnings for the previously recognized non-cash amortization of the beneficial conversion feature. The ASU 2020-06 also removes the presumption of cash settlement for contracts that may be settled in cash or shares. In accordance with the new guidance, we included the dilutive impact of the quarterly contract adjustment payment liability associated with the 2024 Purchase Contracts, which may be settled in cash or shares, in our computation of weighted average diluted common shares outstanding. The adoption of the new guidance did not, and is not expected to, have a material impact on our consolidated financial statements.