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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, 2025 USD ($) DTH kWh gal	Jun. 30, 2024 USD ($) DTH kWh gal	Sep. 30, 2024 USD ($) DTH kWh gal	Jun. 30, 2025 EUR (€) DTH	Sep. 30, 2024 EUR (€) DTH	Jun. 30, 2024 EUR (€) DTH
Commodity contracts \| Regulated Utility Operations \| Natural Gas
Derivative [Line Items]
Notional amount (in units)	15	14	26	15	26	14
Commodity contracts \| Non-utility Operations \| LPG swaps
Derivative [Line Items]
LPG swaps (in gallons) \| gal	536	416	458
Commodity contracts \| Non-utility Operations \| Electricity forward and futures contracts
Derivative [Line Items]
Electricity forward and futures contracts (in kilowatt hours) \| kWh	791	651	1,113
Natural gas futures, forward, basis swap, options and pipeline contracts \| Non-utility Operations \| Natural Gas
Derivative [Line Items]
Notional amount (in units)	241	320	325	241	325	320
Interest rate swaps
Derivative [Line Items]
Notional amount	$ 1,446	$ 1,260	$ 1,231	€ 300	€ 300	€ 300
Forward foreign currency exchange contracts
Derivative [Line Items]
Notional amount	$ 440	$ 367	$ 389	€ 106	€ 181	€ 181