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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts Related to Open Derivative Contracts (Details) € in Millions, kWh in Millions, gal in Millions, DTH in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) DTH kWh gal | Sep. 30, 2024 USD ($) DTH kWh gal | Sep. 30, 2025 EUR (€) DTH | Sep. 30, 2024 EUR (€) DTH
Interest rate swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 1,443 | $ 1,231 | € 300 | € 300
Forward foreign currency exchange contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 500 | $ 389 | € 106 | € 181
Natural Gas | Commodity contracts | Regulated Utility Operations |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount (in units) | 28 | 26 | 28 | 26
Natural Gas | Natural gas futures, forward, basis swap, options and pipeline contracts | Non-utility Operations |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount (in units) | 237 | 325 | 237 | 325
LPG swaps | Commodity contracts | Non-utility Operations |  |  |  |
Derivative [Line Items] |  |  |  |
LPG swaps (in gallons) | gal | 608 | 458 |  |
Electricity forward and futures contracts | Commodity contracts | Non-utility Operations |  |  |  |
Derivative [Line Items] |  |  |  |
Electricity forward and futures contracts (in kilowatt hours) | kWh | 929 | 1,113 |  |

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