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v3.22.2.2

Equity Method Investments - Narrative (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Feb. 28, 2021 USD ($) | Sep. 30, 2022 USD ($) mi | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments |  |  | $ 130,000,000 | $ 174,000,000 | $ 200,000,000
Equity in income of unconsolidated subsidiaries |  |  | (14,000,000) | (63,000,000) | $ 27,000,000
Pine Run Midstream L L C Member |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total purchase price |  | $ 205,000,000 |  |  |
Total cash paid |  | 115,000,000 |  |  |
Liabilities incurred |  | $ 90,000,000 |  |  |
PennEast |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Pretax impairment charge | $ 93,000,000 |  |  |  |
Equity in income of unconsolidated subsidiaries |  |  | 9,000,000 |  |
PennEast | Level 2 |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments |  |  | $ 0 | 0 |
PennEast | Affiliated Entity |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Area of natural gas pipeline to be constructed (in miles) | mi |  |  | 120 |  |
PennEast | UGI PennEast, LLC | Affiliated Entity |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percent |  |  | 20.00% |  |
PennEast | Southern Company | Affiliated Entity |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percent |  |  | 20.00% |  |
PennEast | New Jersey Resources | Affiliated Entity |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percent |  |  | 20.00% |  |
PennEast | South Jersey Industries | Affiliated Entity |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percent |  |  | 20.00% |  |
PennEast | Enbridge Inc | Affiliated Entity |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percent |  |  | 20.00% |  |
Pennant |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments |  |  |  | $ 93,000,000 |
Pretax impairment charge |  |  | $ 44,000,000 |  |
Pennant | Energy Services |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percent |  |  | 47.00% | 47.00% |
Pine Run Midstream L L C Member |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments |  |  | $ 68,000,000 | $ 60,000,000 |
Ownership percent |  |  | 49.00% |  |
Other Equity Investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Pretax impairment charge |  |  | $ 62,000,000 | $ 21,000,000 |

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