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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts Related to Open Derivative Contracts
The following table summarizes by derivative type the gross notional amounts related to open derivative contracts at September 30, 2025 and 2024 and the final settlement dates of the Company's open derivative contracts as of September 30, 2025, but excluding those derivatives that qualified for the NPNS exception:
Notional Amounts
(in millions)
September 30,
TypeUnitsSettlements Extending Through20252024
Commodity Price Risk:
Regulated Utility Operations
PA Gas Utility NYMEX natural gas futures and option contractsDekathermsSeptember 202628 26 
Non-utility Operations
LPG swapsGallonsMay 2028608 458 
Natural gas futures, forward, basis swap, options and pipeline contractsDekathermsDecember 2029237 325 
Electricity forward and futures contractsKilowatt hoursDecember 2028929 1,113 
Interest Rate Risk:
Interest rate swapsEuroMarch 2026€300 €300 
Interest rate swapsUSDSeptember 2028$1,443 $1,231 
Foreign Currency Exchange Rate Risk:
Forward foreign currency exchange contractsUSDSeptember 2028$500 $389 
Net investment hedge forward foreign exchange contractsEuroDecember 2026€106 €181 
Schedule of Derivative Assets, Liabilities and the Effects of Offsetting
The following table presents the Company’s derivative assets and liabilities by type, as well as the effects of offsetting, as of September 30:
20252024
Derivative assets:
Derivatives designated as hedging instruments:  
Foreign currency contracts$1 $6 
Interest rate contracts— 1 
1 7 
Derivatives subject to PGC and DS mechanisms:
Commodity contracts3 4 
Derivatives not designated as hedging instruments:  
Commodity contracts93 129 
Total derivative assets – gross97 140 
Gross amounts offset in the balance sheet(65)(88)
Cash collateral received(2)(14)
Total derivative assets – net (a)$30 $38 
Derivative liabilities:
Derivatives designated as hedging instruments:
Interest rate contracts$(12)$(22)
Derivatives subject to PGC and DS mechanisms:
Commodity contracts(8)(1)
Derivatives not designated as hedging instruments:
Commodity contracts(125)(151)
Foreign currency contracts(19)(9)
(144)(160)
Total derivative liabilities – gross(164)(183)
Gross amounts offset in the balance sheet65 88 
Cash collateral pledged19 36 
Total derivative liabilities – net$(80)$(59)
(a) Derivative assets with maturities over one year are included in “Other assets” on the Consolidated Balance Sheets.
Schedule of Effects of Derivative Instruments on Condensed Consolidated Statements of Income and Changes in AOCI and Noncontrolling Interest
The following tables provide information on the effects of derivative instruments on the Consolidated Statements of Income and changes in AOCI for Fiscal 2025, Fiscal 2024 and Fiscal 2023:
Gain (Loss)
Recognized in
AOCI		Gain (Loss)
Reclassified from
AOCI into Income		Location of Gain (Loss) Reclassified from
AOCI into Income
 202520242023202520242023
Cash Flow Hedges:       
Interest rate contracts$14 $(19)$25 $3 $49 $40 Interest expense
Net Investment Hedges:       
Foreign currency contracts$(9)$(5)$(21)    
Gain (Loss)
Recognized in Income		Location of Gain (Loss) Recognized in Income
 202520242023
Derivatives Not Designated as Hedging Instruments:
Commodity contracts$(1)$1 $11 Revenues
Commodity contracts3 (92)(1,771)Cost of sales
Commodity contracts(1)3 2 Other operating expense (income), net
Foreign currency contracts(4)(19)(23)Other non-operating income (expense), net
Total$(3)$(107)$(1,781)