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Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |
Contract liabilities | $ 140 | $ 158 |
Contract liabilities, recognized revenue | 120 | $ 127 | $ 119
Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Remaining performance obligations | 2,300 |  |
UGI Utilities, Inc. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Remaining performance obligations | $ 200 |  |
Natural Gas Transportation and Gathering Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Term of contract with customer (up to) | 30 years |  |
Storage Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Term of contract with customer (up to) | 1 year |  |
Natural Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Term of contract with customer (up to) | 15 years |  |

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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