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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts (Details) € in Millions, kWh in Millions, gal in Millions, DTH in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) DTH kWh gal | Sep. 30, 2022 USD ($) DTH kWh gal | Sep. 30, 2023 EUR (€) DTH | Sep. 30, 2022 EUR (€) DTH
Commodity contracts | Propane |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amounts (in millions) | gal | 727 | 874 |  |
Commodity contracts | Electricity |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amounts (in millions) | kWh | 1,260 | 2,446 |  |
Natural gas futures, forward, basis swap, options and pipeline contracts | Natural Gas |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount (in units) | 338 | 363 | 338 | 363
Interest rate swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 1,270 | $ 1,358 | € 300 | € 300
Forward foreign currency exchange contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 425 | $ 465 | € 256 | € 411
Regulated Utility Operations | Commodity contracts | Natural Gas |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount (in units) | 38 | 19 | 38 | 19

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