Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Mar. 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 March 31, 2021, September 30, 2020 and March 31, 2020, and the final settlement dates of the Company's open derivative contracts as of March 31, 2021, excluding those derivatives that qualified for the NPNS exception:

			Notional Amounts (in millions)
Type	Units	Settlements Extending Through	March 31, 2021		September 30, 2020		March 31, 2020
Commodity Price Risk:
Regulated Utility Operations
Gas Utility NYMEX natural gas futures and option contracts	Dekatherms	February 2022	12		22		11
Non-utility Operations
LPG swaps	Gallons	September 2023	557		846		816
Natural gas futures, forward, basis swap, options and pipeline contracts	Dekatherms	September 2025	338		339		343
Electricity forward and futures contracts	Kilowatt hours	December 2024	4,773		4,705		3,663
Interest Rate Risk:
Interest rate swaps	Euro	October 2022	€	300	€	300	€	300
Interest rate swaps	USD	July 2024	$	1,302	$	1,344	$	1,351
Foreign Currency Exchange Rate Risk:
Forward foreign currency exchange contracts	USD	January 2024	$	384	$	511	$	460
Net investment hedge forward foreign exchange contracts	Euro	October 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:

	March 31, 2021		September 30, 2020		March 31, 2020
Derivative assets:
Derivatives designated as hedging instruments:
Foreign currency contracts	$	16	$	17	$	28
Derivatives subject to PGC and DS mechanisms:
Commodity contracts	2		7		1
Derivatives not designated as hedging instruments:
Commodity contracts	233		100		47
Foreign currency contracts	9		15		31
	242		115		78
Total derivative assets — gross	260		139		107
Gross amounts offset in the balance sheet	(35)		(57)		(26)
Cash collateral received	(37)		—		—
Total derivative assets — net	$	188	$	82	$	81
Derivative liabilities:
Derivatives designated as hedging instruments:
Interest rate contracts	$	(39)	$	(55)	$	(54)
Derivatives subject to PGC and DS mechanisms:
Commodity contracts	(1)		—		(2)
Derivatives not designated as hedging instruments:
Commodity contracts	(71)		(118)		(312)
Foreign currency contracts	(12)		(14)		(7)
	(83)		(132)		(319)
Total derivative liabilities — gross	(123)		(187)		(375)
Gross amounts offset in the balance sheet	35		57		26
Cash collateral pledged	—		7		58
Total derivative liabilities — net	$	(88)	$	(123)	$	(291)

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:

Three Months Ended March 31,:
	Gain (Loss) Recognized in AOCI				Loss Reclassified from AOCI into Income				Location of Loss Reclassified from AOCI into Income
Cash Flow Hedges:	2021		2020		2021		2020
Interest rate contracts	6		(50)		(6)		(1)		Interest expense
Net Investment Hedges:
Foreign currency contracts	$	7	$	14
	Gain (Loss) Recognized in Income
Derivatives Not Designated as Hedging Instruments:	2021		2020		Location of Gain (Loss) Recognized in Income
Commodity contracts	$	(2)	$	6	Revenues
Commodity contracts	135		(206)		Cost of sales
Commodity contracts	(2)		—		Operating and administrative expenses
Foreign currency contracts	17		11		Other non-operating income (expense), net
Total	$	148	$	(189)
Six Months Ended March 31,:
	Gain (Loss) Recognized in AOCI				Loss Reclassified from AOCI into Income				Location of Loss Reclassified from AOCI into Income
Cash Flow Hedges:	2021		2020		2021		2020
Interest rate contracts	$	6	$	(42)	$	(13)	$	(2)	Interest expense
Net Investment Hedges:
Foreign currency contracts	$	(1)	$	10
	Gain (Loss) Recognized in Income
Derivatives Not Designated as Hedging Instruments:	2021		2020		Location of Gain (Loss) Recognized in Income
Commodity contracts	$	1	$	8	Revenues
Commodity contracts	238		(239)		Cost of sales
Commodity contracts	5		—		Other operating income, net
Foreign currency contracts	(3)		—		Other non-operating income (expense), net
Total	$	241	$	(231)