Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2022, and December 31, 2021. As of March 31, 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)
	March 31, 2022			December 31, 2021
Commodity	Ameren Missouri	Ameren Illinois	Ameren	Ameren Missouri	Ameren Illinois	Ameren
Fuel oils (in gallons)	25	—	25	30	—	30
Natural gas (in mmbtu)	36	146	182	35	144	179
Power (in MWhs)	4	6	10	6	6	12
Uranium (pounds in thousands)	496	—	496	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 March 31, 2022, and December 31, 2021:

			March 31, 2022					December 31, 2021
	Balance Sheet Location		Ameren Missouri		Ameren Illinois		Ameren			Ameren Missouri		Ameren Illinois		Ameren
Fuel oils	Mark-to-market derivative assets	$	(a)	$	—	$	18		$	(a)	$	—	$	8
	Other current assets		18		—		—			8		—		—
	Other assets		8		—		8			5		—		5
Natural gas	Mark-to-market derivative assets		(a)		74		90			(a)		28		35
	Other current assets		16		—		—			7		—		—
	Other assets		10		23		33			5		13		18
Power	Mark-to-market derivative assets		(a)		5		24			(a)		—		23
	Other current assets		19		—		—			23		—		—
	Other assets		—		—		—			—		—		—
Uranium	Mark-to-market derivative assets		(a)		—		5			(a)		—		—
	Other current assets		5		—		—			—		—		—
	Other assets		2		—		2			1		—		1
	Total assets	$	78	$	102	$	180		$	49	$	41	$	90
Natural gas	Mark-to-market derivative liabilities		—		(a)		(a)			2		(a)		(a)
	Other current liabilities		—		2		2			—		6		8
	Other deferred credits and liabilities		1		1		2			1		2		3
Power	Mark-to-market derivative liabilities		109		(a)		(a)			50		(a)		(a)
	Other current liabilities		—		1		110			—		9		59
	Other deferred credits and liabilities		26		78		104			23		108		131
Uranium	Mark-to-market derivative liabilities		—		(a)		(a)			1		(a)		(a)
	Other current liabilities		—		—		—			—		—		1
	Total liabilities	$	136	$	82	$	218		$	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 March 31, 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
2022
Assets:
Ameren Missouri	$	78	$	19	$	5	$	54
Ameren Illinois	102		6		9		87
Ameren	$	180	$	25	$	14	$	141
Liabilities:
Ameren Missouri	$	136	$	19	$	92	$	25
Ameren Illinois	82		6		—		76
Ameren	$	218	$	25	$	92	$	101
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 “Other current assets” and “Other assets” on the balance sheet.

Derivative Instruments With Credit Risk-Related Contingent Features

The following table presents, as of March 31, 2022, the aggregate fair value of all derivative instruments with credit risk-related contingent features in a gross liability position, the cash collateral posted, and the aggregate amount of additional collateral that counterparties could require.

	Aggregate Fair Value of Derivative Liabilities(a)		Cash Collateral Posted		Potential Aggregate Amount of Additional Collateral Required(b)
Ameren Missouri	$	36	$	18	$	7
Ameren Illinois	4		—		4
Ameren	$	40	$	18	$	11

(a)Before consideration of master netting arrangements or similar agreements.

(b)As collateral requirements with certain counterparties are based on master netting arrangements or similar agreements, the aggregate amount of additional collateral required to be posted is determined after consideration of the effects of such arrangements.