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Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  |  | $ 372 | $ 509
Loss on extinguishment of debt | $ 0 | $ 0 | (11) | 0
AmeriGas Propane |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Loss on extinguishment 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 | 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 | (46) | 59 | (83) | 123
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 |
AmeriGas Propane | Other non-operating income, 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 |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring costs | (1) |  | (15) |
Business transformation expenses |  | (11) |  | (37)
AmeriGas Propane | Loss from equity investees |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impairments associated with certain equity method investments | 0 | 0 | 0 | 0
UGI International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Loss on extinguishment 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 | 0 | 7 | 0
UGI International | Cost of sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 110 | 226 | 458 | 380
UGI International | Other operating income, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 6 |  | 6 |
UGI International | Other non-operating income, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 14 | (1) | 19 | (6)
UGI International | Operating and administrative expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring costs | (2) |  | (4) |
Business transformation expenses |  | (6) |  | (12)
UGI International | Loss from equity investees |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impairments associated with certain equity method investments | 0 | 0 | 0 | 0
Midstream & Marketing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Loss on extinguishment of debt |  |  | 0 |
Midstream & Marketing | Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (4) | (4) | (6) | (4)
Midstream & Marketing | Cost of sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (51) | 44 | (29) | 16
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 |
Midstream & Marketing | Other non-operating income, 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 |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring costs | (1) |  | (1) |
Business transformation expenses |  | 0 |  | 0
Midstream & Marketing | Loss from equity investees |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impairments associated with certain equity method investments | $ (50) | $ (93) | $ (50) | $ (93)

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