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, 2022 USD ($) DTH gal kWh	Dec. 31, 2022 EUR (€) DTH gal kWh	Sep. 30, 2022 USD ($) DTH gal kWh	Sep. 30, 2022 EUR (€) DTH gal kWh	Dec. 31, 2021 USD ($) DTH kWh gal	Dec. 31, 2021 EUR (€) DTH kWh gal
Commodity contracts | Regulated Utility Operations | Natural Gas
Derivative [Line Items]
Notional amount (in units)	15	15	19	19	14	14
Commodity contracts | Non-utility Operations | LPG swaps
Derivative [Line Items]
Notional amount (in units) | gal	844	844	874	874	732	732
Commodity contracts | Non-utility Operations | Electricity forward and futures contracts
Derivative [Line Items]
Notional amount (in units) | kWh	2,270	2,270	2,446	2,446	4,261	4,261
Natural gas futures, forward and pipeline contracts (in dekatherms) | Non-utility Operations | Natural Gas
Derivative [Line Items]
Notional amount (in units)	371	371	363	363	382	382
Interest rate swaps
Derivative [Line Items]
Notional amount	$ 1,354	€ 0	$ 1,358	€ 300	$ 1,418	€ 300
Forward foreign currency exchange contracts
Derivative [Line Items]
Notional amount	$ 390	€ 331	$ 465	€ 411	$ 415	€ 486