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Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | $ (397) | $ 96
Loss on extinguishment of debt | (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
AmeriGas Propane | Cost of sales |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (69) | 37
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
AmeriGas Propane | Operating and administrative expenses |  |
Segment Reporting Information [Line Items] |  |
Business transformation expenses |  | (12)
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 | 3 | 0
UGI International | Cost of sales |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (212) | 106
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 | 6 | (20)
UGI International | Operating and administrative expenses |  |
Segment Reporting Information [Line Items] |  |
Business transformation expenses |  | (3)
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 | 7 | 2
Midstream & Marketing | Cost of sales |  |
Segment Reporting Information [Line Items] |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (132) | (29)
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
Midstream & Marketing | Operating and administrative expenses |  |
Segment Reporting Information [Line Items] |  |
Business transformation expenses |  | $ 0

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