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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	Mar. 31, 2024 USD ($) kWh DTH gal	Mar. 31, 2024 EUR (€) kWh DTH gal	Sep. 30, 2023 USD ($) DTH kWh gal	Sep. 30, 2023 EUR (€) DTH kWh gal	Mar. 31, 2023 USD ($) DTH gal kWh	Mar. 31, 2023 EUR (€) DTH gal kWh
Commodity contracts \| Regulated Utility Operations \| Natural Gas
Derivative [Line Items]
Notional amount (in units)	13	13	38	38	12	12
Commodity contracts \| Non-utility Operations \| LPG swaps
Derivative [Line Items]
Notional amount (in units) \| gal	425	425	727	727	691	691
Commodity contracts \| Non-utility Operations \| Electricity forward and futures contracts
Derivative [Line Items]
Notional amount (in units) \| kWh	544	544	1,260	1,260	1,890	1,890
Natural gas futures, forward, basis swap, options and pipeline contracts \| Non-utility Operations \| Natural Gas
Derivative [Line Items]
Notional amount (in units)	339	339	338	338	366	366
Interest rate swaps
Derivative [Line Items]
Notional amount	$ 1,263	€ 300	$ 1,270	€ 300	$ 1,277	€ 300
Forward foreign currency exchange contracts
Derivative [Line Items]
Notional amount	$ 240	€ 256	$ 425	€ 256	$ 285	€ 331