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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
12 Months Ended
Sep. 30, 2024
USD ($)
DTH
kWh
gal
Sep. 30, 2023
USD ($)
DTH
kWh
gal
Sep. 30, 2024
EUR (€)
DTH
Sep. 30, 2023
EUR (€)
DTH
Interest rate swaps        
Derivative [Line Items]        
Notional amount $ 1,231 $ 1,270 € 300 € 300
Forward foreign currency exchange contracts        
Derivative [Line Items]        
Notional amount $ 389 $ 425 € 181 € 256
Natural Gas | Commodity contracts | Regulated Utility Operations        
Derivative [Line Items]        
Notional amount (in units) 26 38 26 38
Natural Gas | Natural gas futures, forward, basis swap, options and pipeline contracts | Non-utility Operations        
Derivative [Line Items]        
Notional amount (in units) 325 338 325 338
LPG swaps | Commodity contracts | Non-utility Operations        
Derivative [Line Items]        
LPG swaps (in gallons) | gal 458 727    
Electricity forward and futures contracts | Commodity contracts | Non-utility Operations        
Derivative [Line Items]        
Electricity forward and futures contracts (in kilowatt hours) | kWh 1,113 1,260