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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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-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	3 Months Ended		12 Months Ended
	Dec. 31, 2024 USD ($) DTH kWh gal	Dec. 31, 2023 USD ($) DTH kWh gal	Sep. 30, 2024 USD ($) DTH kWh gal	Dec. 31, 2024 EUR (€) DTH	Sep. 30, 2024 EUR (€) DTH	Dec. 31, 2023 EUR (€) DTH
Commodity contracts \| Regulated Utility Operations \| Natural Gas
Derivative [Line Items]
Notional amount (in units)	22	16	26	22	26	16
Commodity contracts \| Non-utility Operations \| LPG swaps
Derivative [Line Items]
LPG swaps (in gallons) \| gal	410	638	458
Commodity contracts \| Non-utility Operations \| Electricity forward and futures contracts
Derivative [Line Items]
Electricity forward and futures contracts (in kilowatt hours) \| kWh	1,031	634	1,113
Natural gas futures, forward, basis swap, options and pipeline contracts \| Non-utility Operations \| Natural Gas
Derivative [Line Items]
Notional amount (in units)	310	331	325	310	325	331
Interest rate swaps
Derivative [Line Items]
Notional amount	$ 1,228	$ 1,267	$ 1,231	€ 300	€ 300	€ 300
Forward foreign currency exchange contracts
Derivative [Line Items]
Notional amount	$ 299	$ 348	$ 389	€ 181	€ 181	€ 256