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Debt - Schedule of Receivables Facility (Details) - Energy Services - Receivables Facility - Energy Services Receivables Facility - USD ($) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Short-term Debt [Line Items] |  |  |
Trade receivables transferred to ESFC during the year | $ 1,946,000,000 | $ 2,221,000,000 | $ 1,353,000,000
ESFC trade receivables sold to the bank during the year | 535,000,000 | 152,000,000 | 308,000,000
ESFC trade receivables - end of year | 62,000,000 | 101,000,000 | $ 61,000,000
Outstanding balance of trade receivables sold | $ 46,000,000 | $ 0 |

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- Definition Outstanding balance of ESFC trade receivables. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sale of trade receivables to consolidated special purpose subsidiary. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Trade receivables sold to commercial paper conduit. + References No definition available. + Details
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Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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