Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2022

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Open Gross Derivative Volumes By Commodity Type

The following table presents open gross commodity contract volumes by commodity type for derivative assets and liabilities as of September 30, 2022, and December 31, 2021. As of September 30, 2022, these contracts extended through October 2024, October 2027, May 2032 and March 2024 for fuel oils, natural gas, power and uranium, respectively:

	Quantity (in millions)
	September 30, 2022			December 31, 2021
Commodity	Ameren Missouri	Ameren Illinois	Ameren	Ameren Missouri	Ameren Illinois	Ameren
Fuel oils (in gallons)	19	—	19	30	—	30
Natural gas (in mmbtu)	43	144	187	35	144	179
Power (in MWhs)	2	6	8	6	6	12
Uranium (pounds in thousands)	406	—	406	586	—	586

Derivative Instruments Carrying Value

The following table presents the carrying value and balance sheet location of all derivative commodity contracts, none of which were designated as hedging instruments, as of September 30, 2022, and December 31, 2021:

			September 30, 2022					December 31, 2021
	Balance Sheet Location		Ameren Missouri		Ameren Illinois		Ameren			Ameren Missouri		Ameren Illinois		Ameren
Fuel oils	Other current assets		12		—		12			8		—		8
	Other assets		3		—		3			5		—		5
Natural gas	Mark-to-market derivative assets		(a)		57		(a)			(a)		28		(a)
	Other current assets		14		—		71			7		—		35
	Other assets		13		21		34			5		13		18
Power	Mark-to-market derivative assets		(a)		11		(a)			(a)		—		(a)
	Other current assets		28		—		39			23		—		23
	Other assets		—		5		5			—		—		—
Uranium	Other current assets		2		—		2			—		—		—
	Other assets		1		—		1			1		—		1
	Total assets	$	73	$	94	$	167		$	49	$	41	$	90
Fuel oils	Other deferred credits and liabilities		1		—		1			—		—		—
Natural gas	Mark-to-market derivative liabilities		2		(a)		(a)			2		(a)		(a)
	Other current liabilities		—		9		11			—		6		8
	Other deferred credits and liabilities		1		3		4			1		2		3
Power	Mark-to-market derivative liabilities		111		(a)		(a)			50		(a)		(a)
	Other current liabilities		—		—		111			—		9		59
	Other deferred credits and liabilities		14		36		50			23		108		131
Uranium	Mark-to-market derivative liabilities		—		(a)		(a)			1		(a)		(a)
	Other current liabilities		—		—		—			—		—		1
	Total liabilities	$	129	$	48	$	177		$	77	$	125	$	202

(a)Balance sheet line item not applicable to registrant.

Offsetting Assets and Liabilities

The following table provides the recognized gross derivative balances and the net amounts of those derivatives subject to an enforceable master netting arrangement or similar agreement as of September 30, 2022, and December 31, 2021:

			Gross Amounts Not Offset in the Balance Sheet
Commodity Contracts Eligible to be Offset	Gross Amounts Recognized in the Balance Sheet		Derivative Instruments		Cash Collateral Received/Posted(a)		Net Amount
September 30, 2022
Assets:
Ameren Missouri	$	73	$	18	$	2	$	53
Ameren Illinois	94		13		1		80
Ameren	$	167	$	31	$	3	$	133
Liabilities:
Ameren Missouri	$	129	$	18	$	99	$	12
Ameren Illinois	48		13		—		35
Ameren	$	177	$	31	$	99	$	47
December 31, 2021
Assets:
Ameren Missouri	$	49	$	15	$	—	$	34
Ameren Illinois	41		4		—		37
Ameren	$	90	$	19	$	—	$	71
Liabilities:
Ameren Missouri	$	77	$	15	$	47	$	15
Ameren Illinois	125		4		—		121
Ameren	$	202	$	19	$	47	$	136

(a)Cash collateral received reduces gross asset balances and is included in “Other current liabilities” and “Other deferred credits and liabilities” on the balance sheet. Cash collateral posted reduces gross liability balances and is included in “Current collateral assets” and “Other assets” on the balance sheet for Ameren and Ameren Missouri and “Other current assets” and “Other assets” for Ameren Illinois.