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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, 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

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