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Summary of Significant Accounting Policies - Equity Method Investments (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) mi | Sep. 30, 2019 USD ($) | Aug. 01, 2019 | Sep. 30, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Investments | $ 256 | $ 242 |  |
Equity method investments | 200 | 190 |  | $ 88
Pennant |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Equity method investments | $ 94 | 91 |  |
Southern Company | PennEast |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Ownership percentage (as a percentage) | 20.00% |  |  |
Enbridge Inc | PennEast |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Ownership percentage (as a percentage) | 20.00% |  |  |
South Jersey Industries | PennEast |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Ownership percentage (as a percentage) | 20.00% |  |  |
UGI PennEast, LLC | PennEast |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Equity method investments | $ 96 | $ 85 |  |
New Jersey Resources | PennEast |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Ownership percentage (as a percentage) | 20.00% |  |  |
PennEast |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Area of natural gas pipeline to be constructed (in miles) | mi | 120 |  |  |
Pipeline contract term | 15 years |  |  |
Affiliated Entity | UGI PennEast, LLC | PennEast |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Ownership percentage (as a percentage) | 20.00% |  |  |
Pennant | Affiliated Entity | CMG |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Percentage of voting interests acquired |  | 47.00% | 47.00% |

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