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Segment Information - Corporate and Other segment information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | $ 648 | $ 1,398 | $ 81
Loss on extinguishment of debt | (11) | 0 | 0
Loss on disposals of Conemaugh and HVAC | 0 | 0 | (54)
Corporate & Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Loss on extinguishment of debt | (11) |  |
Corporate & Other | AmeriGas Propane |  |  |
Segment Reporting Information [Line Items] |  |  |
Loss on extinguishment of debt | 0 |  |
Corporate & Other | AmeriGas Propane | Revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 0 | 0 | 0
Corporate & Other | AmeriGas Propane | Cost of sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (185) | 167 | 72
Corporate & Other | 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 |  |
Corporate & Other | AmeriGas Propane | Operating and administrative expenses |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring costs | (21) | (54) | (44)
Impairment of customer relationship intangible |  | 0 |
Acquisition and integration expenses associated with the CMG Acquisition |  |  | 0
Corporate & Other | 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
Corporate & Other | AmeriGas Propane | (Loss) income from equity investees |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairments of certain equity method investments and assets | 0 | 0 |
Corporate & Other | AmeriGas Propane | Loss on disposals of Conemaugh and HVAC |  |  |
Segment Reporting Information [Line Items] |  |  |
Loss on disposals of Conemaugh and HVAC |  |  | 0
Corporate & Other | UGI International |  |  |
Segment Reporting Information [Line Items] |  |  |
Loss on extinguishment of debt | (11) |  |
Corporate & Other | UGI International | Revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 9 | 0 | 0
Corporate & Other | UGI International | Cost of sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | 797 | 1,065 | 0
Corporate & Other | 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 |  |
Corporate & Other | UGI International | Operating and administrative expenses |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring costs | (9) | (33) | (18)
Impairment of customer relationship intangible |  | (20) |
Acquisition and integration expenses associated with the CMG Acquisition |  |  | 0
Corporate & Other | 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 | 50 | 8 | (36)
Corporate & Other | UGI International | (Loss) income from equity investees |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairments of certain equity method investments and assets | (5) | 0 |
Corporate & Other | UGI International | Loss on disposals of Conemaugh and HVAC |  |  |
Segment Reporting Information [Line Items] |  |  |
Loss on disposals of Conemaugh and HVAC |  |  | 0
Corporate & Other | Midstream & Marketing |  |  |
Segment Reporting Information [Line Items] |  |  |
Loss on extinguishment of debt | 0 |  |
Corporate & Other | Midstream & Marketing | Revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (4) | (15) | 3
Corporate & Other | Midstream & Marketing | Cost of sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Net gains (losses) on commodity derivative instruments not associated with current-period transactions | (21) | 173 | 42
Corporate & Other | 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 |  |
Corporate & Other | Midstream & Marketing | Operating and administrative expenses |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring costs | (1) | 0 | 0
Impairment of customer relationship intangible |  | 0 |
Acquisition and integration expenses associated with the CMG Acquisition |  |  | (2)
Corporate & Other | 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
Corporate & Other | Midstream & Marketing | (Loss) income from equity investees |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairments of certain equity method investments and assets | $ (35) | $ (93) |
Corporate & Other | Midstream & Marketing | Loss on disposals of Conemaugh and HVAC |  |  |
Segment Reporting Information [Line Items] |  |  |
Loss on disposals of Conemaugh and HVAC |  |  | $ (54)

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 https://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI https://asc.fasb.org/extlink&oid=126903467&loc=d3e32787-111569 + Details
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