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Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |
Net gains on commodity derivative instruments not associated with current-period transactions | $ 96 | $ (27)
AmeriGas Propane | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Business transformation expenses | (12) | (11)
AmeriGas Propane | Affiliated Entity | CMG | Pennant | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Acquisition and integration expenses associated with the CMG Acquisition |  | 0
AmeriGas Propane | Commodity contracts | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Net gains on commodity derivative instruments not associated with current-period transactions | 0 | 0
AmeriGas Propane | Cost of sales | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Net gains on commodity derivative instruments not associated with current-period transactions | 37 | 9
AmeriGas Propane | Foreign currency contracts | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Net gains on commodity derivative instruments not associated with current-period transactions | 0 | 0
UGI International | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Business transformation expenses | (3) | (6)
UGI International | Affiliated Entity | CMG | Pennant | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Acquisition and integration expenses associated with the CMG Acquisition |  | 0
UGI International | Commodity contracts | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Net gains on commodity derivative instruments not associated with current-period transactions | 0 | 0
UGI International | Cost of sales | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Net gains on commodity derivative instruments not associated with current-period transactions | 106 | (14)
UGI International | Foreign currency contracts | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Net gains on commodity derivative instruments not associated with current-period transactions | (20) | (15)
Midstream & Marketing | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Business transformation expenses | 0 | 0
Midstream & Marketing | Affiliated Entity | CMG | Pennant | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Acquisition and integration expenses associated with the CMG Acquisition |  | (1)
Midstream & Marketing | Commodity contracts | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Net gains on commodity derivative instruments not associated with current-period transactions | 2 | 2
Midstream & Marketing | Cost of sales | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Net gains on commodity derivative instruments not associated with current-period transactions | (29) | (9)
Midstream & Marketing | Foreign currency contracts | Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Net gains on commodity derivative instruments not associated with current-period transactions | $ 0 | $ 0

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- 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=116868678&loc=d3e1043-128460 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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