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AmeriGas Merger, Acquisitions and Dispositions - Total Cash Paid and Liabilities Incurred (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2020 USD ($) mi | Sep. 30, 2019 USD ($) mi MW | Sep. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |  |
Natural gas lines, acquired (in miles) | mi | 21 | 60 |
Payments to acquire long-term investments | $ 20 | $ 70 |
Natural gas-fired peaking turbine, acquired (mw) | MW |  | 44 |
UGI International |  |  |
Business Acquisition [Line Items] |  |  |
Total cash paid |  | $ 49 | $ 122
Liabilities incurred |  | 0 | 0
Total purchase price |  | 49 | 122
Midstream & Marketing |  |  |
Business Acquisition [Line Items] |  |  |
Total cash paid | 16 | 15 |
Liabilities incurred | 7 | 0 |
Total purchase price | $ 23 | $ 15 |
AmeriGas Propane |  |  |
Business Acquisition [Line Items] |  |  |
Total cash paid |  |  | 10
Liabilities incurred |  |  | 3
Total purchase price |  |  | $ 13

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