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Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  |  | $ (12) | $ (1,866) |
Loss on extinguishments of debt | $ (7) | $ (9) | (7) | (9) |
Impairment of held-for-sale assets | (62) | 0 | (62) | 0 |
Loss on disposal of UGI International energy marketing business | (1) | 0 | (29) | (215) |
Loss associated with impairment of AmeriGas Propane goodwill | 0 | (656) | 0 | (656) |
Corporate & Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on extinguishments of debt | (7) | (9) | (7) | (9) |
Midstream & Marketing | Corporate & Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on extinguishments of debt | (1) | 0 | (1) | 0 |
Loss associated with impairment of AmeriGas Propane goodwill | 0 |  |  | 0 |
Midstream & Marketing | Revenues |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  | 1 | 0 | 7 |
Costs associated with exit of the UGI International energy marketing business |  |  | 0 |  |
Midstream & Marketing | Revenues | Corporate & Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (1) |  |  |  |
Midstream & Marketing | Cost of sales |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 26 | (14) | 20 | (275) |
Midstream & Marketing | Other operating income, net |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  | 0 | 0 | 0 |
Impairment of assets |  |  | 0 |  |
Midstream & Marketing | Operating and administrative expenses |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | 0 |  | 0 |  |
AmeriGas operations enhancement for growth project | 0 | 0 | 0 | 0 |
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 | 0 | 0 |
Midstream & Marketing | Operating and administrative expenses/Other operating income, net |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Costs associated with exit of the UGI International energy marketing business | 0 |  | 0 |  |
Midstream & Marketing | Loss on disposal of UGI International energy marketing business |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Costs associated with exit of the UGI International energy marketing business | 0 |  | 0 | 0 |
Midstream & Marketing | Impairment of held-for-sale assets |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment of held-for-sale assets | (62) |  | (62) |  |
Midstream & Marketing | (Loss) income from equity investees |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment associated with equity method investments | 0 |  | 0 |  |
UGI International | Corporate & Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on extinguishments of debt | 0 | 0 | 0 | 0 |
Loss associated with impairment of AmeriGas Propane goodwill | 0 |  |  | 0 |
UGI International | Revenues |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  | 1 | 1 | 4 |
Costs associated with exit of the UGI International energy marketing business |  |  | (42) |  |
UGI International | Revenues | Corporate & Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 0 |  |  |  |
UGI International | Cost of sales |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 20 | (87) | 32 | (1,491) |
UGI International | Other operating income, net |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  | (1) | (2) | (4) |
Impairment of assets |  |  | (7) |  |
UGI International | Operating and administrative expenses |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | (4) |  | (38) |  |
AmeriGas operations enhancement for growth project | 0 | 0 | 0 | 0 |
Costs associated with exit of the UGI International energy marketing business |  |  |  | (19) |
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 | 1 | (2) | (18) | (52) |
UGI International | Operating and administrative expenses/Other operating income, net |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Costs associated with exit of the UGI International energy marketing business | (1) |  | (11) |  |
UGI International | Loss on disposal of UGI International energy marketing business |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Costs associated with exit of the UGI International energy marketing business | (1) |  | (29) | (215) |
UGI International | Impairment of held-for-sale assets |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment of held-for-sale assets | 0 |  | 0 |  |
UGI International | (Loss) income from equity investees |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment associated with equity method investments | (25) |  | (25) |  |
AmeriGas Propane |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss associated with impairment of AmeriGas Propane goodwill |  |  |  |  | $ (656)
AmeriGas Propane | Corporate & Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on extinguishments of debt | (6) | (9) | (6) | (9) |
Loss associated with impairment of AmeriGas Propane goodwill | (656) |  |  | (656) |
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 | Revenues | Corporate & Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 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 | (51) | 31 | (55) |
AmeriGas Propane | Other operating income, net |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  | 0 | 0 | 0 |
Impairment of assets |  |  | 0 |  |
AmeriGas Propane | Operating and administrative expenses |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | (2) |  | (2) |  |
AmeriGas operations enhancement for growth project | (12) | (6) | (25) | (19) |
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 | 0 | 0 |
AmeriGas Propane | Operating and administrative expenses/Other operating income, net |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Costs associated with exit of the UGI International energy marketing business | 0 |  | 0 |  |
AmeriGas Propane | Loss on disposal of UGI International energy marketing business |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Costs associated with exit of the UGI International energy marketing business | 0 |  | 0 | $ 0 |
AmeriGas Propane | Impairment of held-for-sale assets |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment of held-for-sale assets | 0 |  | 0 |  |
AmeriGas Propane | (Loss) income from equity investees |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment associated with equity method investments | $ 0 |  | $ 0 |  |

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