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Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended
Dec. 31, 2020
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, 2020, September 30, 2020 and December 31, 2019, and the final settlement dates of the Company's open derivative contracts as of December 31, 2020, excluding those derivatives that qualified for the NPNS exception:
Notional Amounts
(in millions)
TypeUnitsSettlements Extending ThroughDecember 31, 2020September 30, 2020December 31, 2019
Commodity Price Risk:
Regulated Utility Operations
Gas Utility NYMEX natural gas futures and option contractsDekathermsOctober 202116 22 15 
Non-utility Operations
LPG swapsGallonsSeptember 2023719 846 772 
Natural gas futures, forward, basis swap, options and pipeline contractsDekathermsMay 2025342 339 358 
Electricity long forward and futures contractsKilowatt hoursDecember 20244,719 4,517 4,145 
Electricity short forward and futures contractsKilowatt hoursDecember 202497 188 556 
Interest Rate Risk:
Interest rate swapsEuroOctober 2022€300 €300 €300 
Interest rate swapsUSDJuly 2024$1,306 $1,344 $1,354 
Foreign Currency Exchange Rate Risk:
Forward foreign currency exchange contractsUSDSeptember 2023$457 $511 $431 
Net investment hedge forward foreign exchange contractsEuroOctober 2024€173 €173 €173 
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:
December 31,
2020		September 30,
2020		December 31,
2019
Derivative assets:
Derivatives designated as hedging instruments:  
Foreign currency contracts$8 $17 $14 
Interest rate contracts— — 3 
8 17 17 
Derivatives subject to PGC and DS mechanisms:
Commodity contracts1 7 — 
Derivatives not designated as hedging instruments:  
Commodity contracts170 100 46 
Foreign currency contracts6 15 26 
176 115 72 
Total derivative assets — gross185 139 89 
Gross amounts offset in the balance sheet(48)(57)(27)
Cash collateral received(6)— (2)
Total derivative assets — net$131 $82 $60 
Derivative liabilities:
Derivatives designated as hedging instruments:
Interest rate contracts$(50)$(55)$(7)
Derivatives subject to PGC and DS mechanisms:
Commodity contracts(2)— (3)
Derivatives not designated as hedging instruments:
Commodity contracts(70)(118)(184)
Foreign currency contracts(25)(14)(4)
(95)(132)(188)
Total derivative liabilities — gross(147)(187)(198)
Gross amounts offset in the balance sheet48 57 27 
Cash collateral pledged— 7 11 
Total derivative liabilities — net$(99)$(123)$(160)
Effects of Derivative Instruments on Condensed Consolidated Statements of Income and Changes in AOCI and Noncontrolling Interest
The following tables provide information on the effects of derivative instruments on the Condensed Consolidated Statements of Income and changes in AOCI for the three months ended December 31, 2020 and 2019:
Three Months Ended December 31,:
Gain (Loss)
Recognized in
AOCI		Loss
Reclassified from
AOCI into Income		Location of Loss Reclassified from
AOCI into Income
Cash Flow Hedges:2020201920202019
Interest rate contracts$— $8 $(7)$(1)Interest expense
Net Investment Hedges:
Foreign currency contracts$(8)$(4)
Gain (Loss)
Recognized in Income
Derivatives Not Designated as Hedging Instruments:20202019Location of Gain (Loss) Recognized in Income
Commodity contracts$3 $2 Revenues
Commodity contracts103 (33)Cost of sales
Commodity contracts2 — Operating and administrative expenses
Commodity contracts5 — Other operating income, net
Foreign currency contracts(20)(11)Other non-operating expense, net
Total$93 $(42)