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Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended
Dec. 31, 2024
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 December 31, 2024, September 30, 2024 and December 31, 2023, and the final settlement dates of the Company's open derivative contracts as of December 31, 2024, but excluding those derivatives that qualified for the NPNS exception:
Notional Amounts
(in millions)
TypeUnitsSettlements Extending ThroughDecember 31, 2024September 30, 2024December 31, 2023
Commodity Price Risk:
Regulated Utility Operations
PA Gas Utility NYMEX natural gas futures and option contractsDekathermsSeptember 202522 26 16 
Non-utility Operations
LPG swapsGallonsSeptember 2027410 458 638 
Natural gas futures, forward, basis swap, options and pipeline contractsDekathermsDecember 2028310 325 331 
Electricity forward and futures contracts Kilowatt hoursDecember 20271,031 1,113 634 
Interest Rate Risk:
Interest rate swapsEuroMarch 2026€300 €300 €300 
Interest rate swapsUSDSeptember 2027$1,228 $1,231 $1,267 
Foreign Currency Exchange Rate Risk:
Forward foreign currency exchange contractsUSDSeptember 2027$299 $389 $348 
Net investment hedge forward foreign exchange contractsEuroDecember 2026€181 €181 €256 
Schedule of Derivative Assets, Liabilities and Effects of Offsetting
The following table presents the Company’s derivative assets and liabilities by type, as well as the effects of offsetting:
December 31,
2024		September 30,
2024		December 31,
2023
Derivative assets:
Derivatives designated as hedging instruments:  
Foreign currency contracts$19 $6 $5 
Interest rate contracts5 1 15 
24 7 20 
Derivatives subject to PGC and DS mechanisms:
Commodity contracts6 4 11 
Derivatives not designated as hedging instruments:  
Commodity contracts157 129 151 
Foreign currency contracts14 — 7 
171 129 158 
Total derivative assets — gross201 140 189 
Gross amounts offset in the balance sheet(83)(88)(116)
Cash collateral received(31)(14)(17)
Total derivative assets — net$87 $38 $56 
Derivative liabilities:
Derivatives designated as hedging instruments:
Foreign currency contracts$— $— $(1)
Interest rate contracts(9)(22)(16)
(9)(22)(17)
Derivatives subject to PGC and DS mechanisms:
Commodity contracts— (1)(22)
Derivatives not designated as hedging instruments:
Commodity contracts(112)(151)(309)
Foreign currency contracts(1)(9)(5)
(113)(160)(314)
Total derivative liabilities — gross(122)(183)(353)
Gross amounts offset in the balance sheet83 88 116 
Cash collateral pledged4 36 64 
Total derivative liabilities — net$(35)$(59)$(173)
Schedule of Effects of Derivative Instruments on Condensed Consolidated Statements of Income and Changes in AOCI
The following tables provide information on the effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI:
Three Months Ended December 31,:
Gain (Loss)
Recognized in
AOCI		Gain (Loss)
Reclassified from
AOCI into Income		Location of Gain (Loss) Reclassified from
AOCI into Income
Cash Flow Hedges:2024202320242023
Interest rate contracts$20 $(22)$2 $13 Interest expense
Net Investment Hedges:
Foreign currency contracts$13 $(10)
Gain (Loss)
Recognized in Income
Derivatives Not Designated as Hedging Instruments:20242023Location of Gain (Loss) Recognized in Income
Commodity contracts$(1)$2 Revenues
Commodity contracts69 (155)Cost of sales
Commodity contracts(1)3 Other operating expense (income), net
Foreign currency contracts25 (16)Other non-operating income (expense), net
Total$92 $(166)