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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, 2021 USD ($) DTH kWh gal | Dec. 31, 2021 EUR (€) DTH kWh gal | Sep. 30, 2021 USD ($) gal DTH kWh | Sep. 30, 2021 EUR (€) gal DTH kWh | Dec. 31, 2020 USD ($) DTH kWh gal | Dec. 31, 2020 EUR (€) DTH kWh gal
--- | --- | --- | --- | --- | --- | ---
Commodity contracts | Regulated Utility Operations | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 14 | 14 | 20 | 20 | 16 | 16
Commodity contracts | Non-utility Operations | LPG |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 732 | 732 | 708 | 708 | 719 | 719
Commodity contracts | Non-utility Operations | Electricity |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 4,261 | 4,261 | 4,302 | 4,302 | 4,816 | 4,816
Natural gas futures, forward and pipeline contracts (in dekatherms) | Non-utility Operations | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 382 | 382 | 355 | 355 | 342 | 342
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 1,418 | € 300 | $ 1,421 | € 300 | $ 1,306 | € 300
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 415 | € 486 | $ 509 | € 173 | $ 457 | € 173

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