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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 | Mar. 31, 2023 USD ($) gal kWh DTH | Mar. 31, 2023 EUR (€) gal kWh DTH | Sep. 30, 2022 USD ($) DTH gal kWh | Sep. 30, 2022 EUR (€) DTH gal kWh | Mar. 31, 2022 USD ($) kWh DTH gal | Mar. 31, 2022 EUR (€) kWh DTH gal
--- | --- | --- | --- | --- | --- | ---
Commodity contracts | Regulated Utility Operations | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 12 | 12 | 19 | 19 | 11 | 11
Commodity contracts | Non-utility Operations | LPG swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 691 | 691 | 874 | 874 | 622 | 622
Commodity contracts | Non-utility Operations | Electricity forward and futures contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 1,890 | 1,890 | 2,446 | 2,446 | 3,098 | 3,098
Natural gas futures, forward and pipeline contracts (in dekatherms) | Non-utility Operations | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 366 | 366 | 363 | 363 | 346 | 346
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 1,277 | € 300 | $ 1,358 | € 300 | $ 1,414 | € 300
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 285 | € 331 | $ 465 | € 411 | $ 274 | € 486

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