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Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | $ (1,402) | $ (397)
Impairment of assets | (19) | 0
Loss on extinguishments of debt | 0 | (11)
AmeriGas Propane |  |
Segment Reporting Information [Line Items] |  |
Loss on extinguishments of debt |  | 0
AmeriGas Propane | Revenues |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 0 | 0
AmeriGas Propane | Cost of sales |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (12) | (69)
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 |
AmeriGas Propane | Other non-operating (expense) income, net |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 0 | 0
AmeriGas Propane | Operating and administrative expenses |  |
Segment Reporting Information [Line Items] |  |
AmeriGas operations enhancement for growth project | (7) |
Impairment of assets | 0 |
AmeriGas Propane | Loss on disposal of U.K. energy marketing business |  |
Segment Reporting Information [Line Items] |  |
Loss on disposal of U.K. energy marketing business | 0 |
UGI International |  |
Segment Reporting Information [Line Items] |  |
Loss on extinguishments of debt |  | (11)
UGI International | Revenues |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 2 | 3
UGI International | Cost of sales |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (1,169) | (212)
UGI International | Other operating income, net |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (2) |
UGI International | Other non-operating (expense) income, net |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (40) | 6
UGI International | Operating and administrative expenses |  |
Segment Reporting Information [Line Items] |  |
AmeriGas operations enhancement for growth project | 0 |
Impairment of assets | (19) |
UGI International | Loss on disposal of U.K. energy marketing business |  |
Segment Reporting Information [Line Items] |  |
Loss on disposal of U.K. energy marketing business | (215) |
Midstream & Marketing |  |
Segment Reporting Information [Line Items] |  |
Loss on extinguishments of debt |  | 0
Midstream & Marketing | Revenues |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 2 | 7
Midstream & Marketing | Cost of sales |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (183) | (132)
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 |
Midstream & Marketing | Other non-operating (expense) income, net |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 0 | $ 0
Midstream & Marketing | Operating and administrative expenses |  |
Segment Reporting Information [Line Items] |  |
AmeriGas operations enhancement for growth project | 0 |
Impairment of assets | 0 |
Midstream & Marketing | Loss on disposal of U.K. energy marketing business |  |
Segment Reporting Information [Line Items] |  |
Loss on disposal of U.K. energy marketing business | $ 0 |

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