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Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions |  |  | $ 509 | $ 1
Impairment of assets held-for-sale | $ 0 | $ (52) | 0 | (52)
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 | 59 | 60 | 123 | 48
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 |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Business transformation expenses | (11) | (3) | (37) | (27)
AmeriGas Propane | Operating and administrative expenses | CMG Acquisition |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Acquisition and integration expenses associated with the CMG Acquisition |  |  |  | 0
AmeriGas Propane | Impairment of assets held-for-sale |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impairment of assets held-for-sale |  | 0 |  | 0
AmeriGas Propane | (Loss) income from equity investees |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impairment of investment in PennEast | 0 |  | 0 |
UGI International | Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 0 | 0 | 0 | 0
UGI International | Cost of sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 226 | 78 | 380 | (54)
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) | (7) | (6) | (20)
UGI International | Operating and administrative expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Business transformation expenses | (6) | (4) | (12) | (16)
UGI International | Operating and administrative expenses | CMG Acquisition |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Acquisition and integration expenses associated with the CMG Acquisition |  |  |  | 0
UGI International | Impairment of assets held-for-sale |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impairment of assets held-for-sale |  | 0 |  | 0
UGI International | (Loss) income from equity investees |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impairment of investment in PennEast | 0 |  | 0 |
Midstream & Marketing | Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (4) | 3 | (4) | 8
Midstream & Marketing | Cost of sales |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 44 | 22 | 16 | 19
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 |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Business transformation expenses | 0 | 0 | 0 | 0
Midstream & Marketing | Operating and administrative expenses | CMG Acquisition |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Acquisition and integration expenses associated with the CMG Acquisition |  |  |  | (2)
Midstream & Marketing | Impairment of assets held-for-sale |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impairment of assets held-for-sale |  | $ (52) |  | $ (52)
Midstream & Marketing | (Loss) income from equity investees |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impairment of investment in PennEast | $ 93 |  | $ 93 |

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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