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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, 2022
USD ($)
DTH
kWh
gal
Sep. 30, 2021
USD ($)
DTH
kWh
gal
Sep. 30, 2022
EUR (€)
DTH
Sep. 30, 2021
EUR (€)
DTH
Commodity contracts | Propane        
Derivative [Line Items]        
Notional Amounts (in millions) | gal 874 708    
Commodity contracts | Electricity        
Derivative [Line Items]        
Notional Amounts (in millions) | kWh 2,446 4,302    
Natural gas futures, forward, basis swap, options and pipeline contracts | Natural Gas        
Derivative [Line Items]        
Notional amount (in units) 363 355 363 355
Interest rate swaps        
Derivative [Line Items]        
Notional amount $ 1,358 $ 1,421 € 300 € 300
Forward foreign exchange contracts        
Derivative [Line Items]        
Notional amount $ 465 $ 509 € 411 € 173
Regulated Utility Operations | Commodity contracts | Natural Gas        
Derivative [Line Items]        
Notional amount (in units) 19 20 19 20