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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 | Jun. 30, 2022 USD ($) DTH kWh gal | Jun. 30, 2022 EUR (€) DTH kWh gal | Sep. 30, 2021 USD ($) gal DTH kWh | Sep. 30, 2021 EUR (€) gal DTH kWh | Jun. 30, 2021 USD ($) gal kWh DTH | Jun. 30, 2021 EUR (€) gal kWh DTH
--- | --- | --- | --- | --- | --- | ---
Commodity contracts | Regulated Utility Operations | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 13 | 13 | 20 | 20 | 12 | 12
Commodity contracts | Non-utility Operations | LPG |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 669 | 669 | 708 | 708 | 688 | 688
Commodity contracts | Non-utility Operations | Electricity |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 2,621 | 2,621 | 4,302 | 4,302 | 4,730 | 4,730
Natural gas futures, forward and pipeline contracts (in dekatherms) | Non-utility Operations | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 353 | 353 | 355 | 355 | 344 | 344
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 1,411 | € 300 | $ 1,421 | € 300 | $ 1,424 | € 300
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 435 | € 411 | $ 509 | € 173 | $ 504 | € 173

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