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Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  |  | $ 341 | $ 185
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 |
AmeriGas Propane | Cost of sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 32 | 27 | (37) | 64
AmeriGas Propane | Operating and administrative expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring costs | (14) |  | (14) |
Business transformation expenses |  | (14) |  | (26)
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
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 | 5 |
UGI International | Cost of sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 560 | 48 | 348 | 154
UGI International | Operating and administrative expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring costs | (2) |  | (2) |
Business transformation expenses |  | (3) |  | (6)
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) | 15 | 5 | (5)
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 | (9) | (2) | (2) |
Midstream & Marketing | Cost of sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 154 | 1 | 22 | (28)
Midstream & Marketing | Operating and administrative expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring costs | 0 |  | 0 |
Business transformation expenses |  | 0 |  | 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

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