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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 | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) DTH kWh gal | Jun. 30, 2023 USD ($) DTH kWh gal | Sep. 30, 2023 USD ($) DTH kWh gal | Jun. 30, 2024 EUR (€) DTH | Sep. 30, 2023 EUR (€) DTH | Jun. 30, 2023 EUR (€) DTH
Commodity contracts | Regulated Utility Operations | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 14 | 24 | 38 | 14 | 38 | 24
Commodity contracts | Non-utility Operations | LPG swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
LPG swaps (in gallons) | gal | 416 | 734 | 727 |  |  |
Commodity contracts | Non-utility Operations | Electricity forward and futures contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Electricity forward and futures contracts (in kilowatt hours) | kWh | 651 | 1,586 | 1,260 |  |  |
Natural gas futures, forward, basis swap, options and pipeline contracts | Non-utility Operations | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 320 | 357 | 338 | 320 | 338 | 357
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 1,260 | $ 1,274 | $ 1,270 | € 300 | € 300 | € 300
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 367 | $ 434 | $ 425 | € 181 | € 256 | € 256

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