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Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  |  | $ 107 | $ (54)
Midstream & Marketing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  | $ 0 |  | 0
Restructuring costs |  | 0 |  | 0
AmeriGas operations enhancement for growth project |  | 0 |  | 0
Costs associated with exit of the UGI International energy marketing business |  | 0 |  | 0
Impairment of assets |  | 0 |  | 0
Midstream & Marketing | Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | $ (1) |  | (2) | 1
Costs associated with exit of the UGI International energy marketing business |  |  |  | 0
Midstream & Marketing | Cost of sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 26 | 41 | 85 | (6)
Midstream & Marketing | Other operating expense (income), net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  | 0 | 0 | 0
Interest income from intersegment loan | 0 |  | 0 |
Midstream & Marketing | Operating and administrative expenses/Other operating expense (income), net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Costs associated with exit of the UGI International energy marketing business |  |  |  | 0
Midstream & Marketing | Other non-operating income (expense), net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 0 |  | 0 |
UGI International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  | 1 |  | (19)
Restructuring costs |  | (34) |  | (34)
AmeriGas operations enhancement for growth project |  | 0 |  | 0
Costs associated with exit of the UGI International energy marketing business |  | (2) |  | (28)
Impairment of assets |  | (7) |  | (7)
UGI International | Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 0 |  | 0 | 1
Costs associated with exit of the UGI International energy marketing business |  |  |  | (42)
UGI International | Cost of sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (8) | 53 | 4 | 12
UGI International | Other operating expense (income), net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  | 1 | 1 | (2)
Interest income from intersegment loan | 3 |  | 3 |
UGI International | Operating and administrative expenses/Other operating expense (income), net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Costs associated with exit of the UGI International energy marketing business |  |  |  | (10)
UGI International | Other non-operating income (expense), net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (13) |  | 9 |
AmeriGas Propane |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  | 0 |  | 0
Restructuring costs |  | 0 |  | 0
AmeriGas operations enhancement for growth project |  | (6) |  | (13)
Costs associated with exit of the UGI International energy marketing business |  | 0 |  | 0
Impairment of assets |  | 0 |  | 0
AmeriGas Propane | Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 0 |  | 0 | 0
Costs associated with exit of the UGI International energy marketing business |  |  |  | 0
AmeriGas Propane | Cost of sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 3 | 34 | 10 | 28
AmeriGas Propane | Other operating expense (income), net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  | $ 0 | 0 | 0
Interest income from intersegment loan | 0 |  | 0 |
AmeriGas Propane | Operating and administrative expenses/Other operating expense (income), net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Costs associated with exit of the UGI International energy marketing business |  |  |  | $ 0
AmeriGas Propane | Other non-operating income (expense), net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | $ 0 |  | $ 0 |

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