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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 | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) DTH kWh gal | Mar. 31, 2024 USD ($) DTH kWh gal | Sep. 30, 2024 USD ($) DTH kWh gal | Mar. 31, 2025 EUR (€) DTH | Sep. 30, 2024 EUR (€) DTH | Mar. 31, 2024 EUR (€) DTH
Commodity contracts | Regulated Utility Operations | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 18 | 13 | 26 | 18 | 26 | 13
Commodity contracts | Non-utility Operations | LPG swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
LPG swaps (in gallons) | gal | 414 | 425 | 458 |  |  |
Commodity contracts | Non-utility Operations | Electricity forward and futures contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Electricity forward and futures contracts (in kilowatt hours) | kWh | 842 | 544 | 1,113 |  |  |
Natural gas futures, forward, basis swap, options and pipeline contracts | Non-utility Operations | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 266 | 339 | 325 | 266 | 325 | 339
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 1,224 | $ 1,263 | $ 1,231 | € 300 | € 300 | € 300
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 202 | $ 240 | $ 389 | € 181 | € 181 | € 256

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