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Nominal volume used to calculate payments on a derivative instrument.

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Nominal or face amount used to calculate payment on derivative.

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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, 2026 USD ($) dth kWh gal	Jun. 30, 2025 USD ($) dth kWh gal	Sep. 30, 2025 USD ($) dth kWh gal	Jun. 30, 2026 EUR (€)	Sep. 30, 2025 EUR (€)	Jun. 30, 2025 EUR (€)
Commodity contracts \| Regulated Utility Operations \| Natural Gas
Derivative [Line Items]
Notional amount (in units)	12	15	28
Commodity contracts \| Non-utility Operations \| LPG swaps
Derivative [Line Items]
LPG swaps (in gallons) \| gal	401	536	608
Commodity contracts \| Non-utility Operations \| Electricity forward and futures contracts
Derivative [Line Items]
Notional amount (in units) \| kWh	999	791	929
Natural gas futures, forward, basis swap, options and pipeline contracts \| Non-utility Operations \| Natural Gas
Derivative [Line Items]
Notional amount (in units)	212	241	237
Interest rate swaps
Derivative [Line Items]
Notional amount	$ 1,585	$ 1,446	$ 1,443	€ 200	€ 300	€ 300
Forward foreign currency exchange contracts
Derivative [Line Items]
Notional amount	$ 468	$ 440	$ 500	€ 106	€ 106	€ 106