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Nominal number of units used to calculate payment on derivative.

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Nominal energy measure used to calculate payments on a derivative instrument.

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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
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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