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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	Dec. 31, 2023 USD ($) gal DTH kWh	Dec. 31, 2023 EUR (€) gal DTH kWh	Sep. 30, 2023 USD ($) DTH gal kWh	Sep. 30, 2023 EUR (€) DTH gal kWh	Dec. 31, 2022 USD ($) kWh DTH gal	Dec. 31, 2022 EUR (€) kWh DTH gal
Commodity contracts \| Regulated Utility Operations \| Natural Gas
Derivative [Line Items]
Notional amount (in units)	16	16	38	38	15	15
Commodity contracts \| Non-utility Operations \| LPG swaps
Derivative [Line Items]
Notional amount (in units) \| gal	638	638	727	727	844	844
Commodity contracts \| Non-utility Operations \| Electricity forward and futures contracts
Derivative [Line Items]
Notional amount (in units) \| kWh	634	634	1,260	1,260	2,270	2,270
Natural gas futures, forward, basis swap, options and pipeline contracts \| Non-utility Operations \| Natural Gas
Derivative [Line Items]
Notional amount (in units)	331	331	338	338	371	371
Interest rate swaps
Derivative [Line Items]
Notional amount	$ 1,267	€ 300	$ 1,270	€ 300	$ 1,354	€ 0
Forward foreign currency exchange contracts
Derivative [Line Items]
Notional amount	$ 348	€ 256	$ 425	€ 256	$ 390	€ 331