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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, 2023 USD ($) kWh DTH gal | Jun. 30, 2023 EUR (€) kWh DTH gal | Sep. 30, 2022 USD ($) kWh DTH gal | Sep. 30, 2022 EUR (€) kWh DTH gal | Jun. 30, 2022 USD ($) gal DTH kWh | Jun. 30, 2022 EUR (€) gal DTH kWh
--- | --- | --- | --- | --- | --- | ---
Commodity contracts | Regulated Utility Operations | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 24 | 24 | 19 | 19 | 13 | 13
Commodity contracts | Non-utility Operations | LPG swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 734 | 734 | 874 | 874 | 669 | 669
Commodity contracts | Non-utility Operations | Electricity forward and futures contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 1,586 | 1,586 | 2,446 | 2,446 | 2,621 | 2,621
Natural gas futures, forward, basis swap, options and pipeline contracts | Non-utility Operations | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 357 | 357 | 363 | 363 | 353 | 353
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 1,274 | € 300 | $ 1,358 | € 300 | $ 1,411 | € 300
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 434 | € 256 | $ 465 | € 411 | $ 435 | € 411

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