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Impairments Associated with Certain Equity Method Investments (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) mi | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) mi | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($)
Loss from equity investees | Midstream & Marketing |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Impairments associated with certain equity method investments |  | $ 50,000,000 | $ 93,000,000 | $ 50,000,000 | $ 93,000,000 |
Pennant | Energy Services |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment ownership percent |  | 47.00% |  | 47.00% |  |
Impairments associated with certain equity method investments |  | $ 50,000,000 |  |  |  |
PennEast | UGI Penn East LLC | Affiliated Entity |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment ownership percent |  | 20.00% |  | 20.00% |  |
Area of natural gas pipeline to be constructed (in miles) | mi |  | 120 |  | 120 |  |
Impairments associated with certain equity method investments | $ 93,000,000 |  |  |  |  |
PennEast | UGI Penn East LLC | Affiliated Entity | Level 2 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investments | $ 0 |  | $ 0 |  | $ 0 | $ 0

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