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Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended
Dec. 31, 2021
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, 2021, September 30, 2021 and December 31, 2020, and the final settlement dates of the Company's open derivative contracts as of December 31, 2021, excluding those derivatives that qualified for the NPNS exception:
Notional Amounts
(in millions)
TypeUnitsSettlements Extending ThroughDecember 31, 2021September 30, 2021December 31, 2020
Commodity Price Risk:
Regulated Utility Operations
PA Gas Utility NYMEX natural gas futures and option contractsDekathermsSeptember 202214 20 16 
Non-utility Operations
LPG swapsGallonsSeptember 2024732 708 719 
Natural gas futures, forward, basis swap, options and pipeline contractsDekathermsSeptember 2026382 355 342 
Electricity forward and futures contractsKilowatt hoursJanuary 20264,261 4,302 4,816 
Interest Rate Risk:
Interest rate swapsEuroOctober 2022€300 €300 €300 
Interest rate swapsUSDSeptember 2024$1,418 $1,421 $1,306 
Foreign Currency Exchange Rate Risk:
Forward foreign currency exchange contractsUSDSeptember 2024$415 $509 $457 
Net investment hedge forward foreign exchange contractsEuroDecember 2026€486 €173 €173 
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,
2021		September 30,
2021		December 31,
2020
Derivative assets:
Derivatives designated as hedging instruments:  
Foreign currency contracts$10 $20 $8 
Interest rate contracts5 — — 
15 20 8 
Derivatives subject to PGC and DS mechanisms:
Commodity contracts10 58 1 
Derivatives not designated as hedging instruments:  
Commodity contracts1,112 1,591 170 
Foreign currency contracts19 18 6 
1,131 1,609 176 
Total derivative assets — gross1,156 1,687 185 
Gross amounts offset in the balance sheet(116)(216)(48)
Cash collateral received(205)(468)(6)
Total derivative assets — net$835 $1,003 $131 
Derivative liabilities:
Derivatives designated as hedging instruments:
Foreign currency contracts$(3)$— $— 
Interest rate contracts(17)(29)(50)
(20)(29)(50)
Derivatives subject to PGC and DS mechanisms:
Commodity contracts(7)(23)(2)
Derivatives not designated as hedging instruments:
Commodity contracts(171)(257)(70)
Foreign currency contracts(4)(8)(25)
(175)(265)(95)
Total derivative liabilities — gross(202)(317)(147)
Gross amounts offset in the balance sheet116 216 48 
Cash collateral pledged— 3 — 
Total derivative liabilities — net$(86)$(98)$(99)
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		Loss
Reclassified from
AOCI into Income		Location of Loss Reclassified from
AOCI into Income
Cash Flow Hedges:2021202020212020
Interest rate contracts$12 $— $(6)$(7)Interest expense
Net Investment Hedges:
Foreign currency contracts$— $(8)
Gain (Loss)
Recognized in Income
Derivatives Not Designated as Hedging Instruments:20212020Location of Gain (Loss) Recognized in Income
Commodity contracts$8 $3 Revenues
Commodity contracts(273)103 Cost of sales
Commodity contracts— 2 Operating and administrative expenses
Commodity contracts— 5 Other operating income, net
Foreign currency contracts8 (20)Other non-operating income (expense), net
Total$(257)$93