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Supplemental Information (Tables)

12 Months Ended

Dec. 31, 2022

Schedule of Cash and Cash Equivalents Including Restricted Cash

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets and the statements of cash flows as of December 31, 2022 and 2021:


	December 31, 2022						December 31, 2021
	Ameren		Ameren Missouri		Ameren Illinois		Ameren		Ameren Missouri		Ameren Illinois
Cash and cash equivalents	$	10	$	—	$	—	$	8	$	—	$	—
Restricted cash included in “Other current assets”	13		5		6		16		4		6
Restricted cash included in “Other assets”	185		—		185		127		—		127
Restricted cash included in “Nuclear decommissioning trust fund”	8		8		—		4		4		—
Total cash, cash equivalents, and restricted cash	$	216	$	13	$	191	$	155	$	8	$	133

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheet and the statement of cash flows as of December 31, 2022 and 2021:


(In millions)	2022		2021
Cash and cash equivalents	$	—	$	—
Restricted cash included in “Other current assets”	—		4
Total cash, cash equivalents, and restricted cash	$	—	$	4

Schedule of Accounts, Notes, Loans and Financing Receivable

The following table provides a reconciliation of the beginning and ending amount of the allowance for doubtful accounts for the years ended December 31, 2022 and 2021:


	December 31, 2022						December 31, 2021
	Ameren Missouri		Ameren Illinois(a)		Ameren			Ameren Missouri		Ameren Illinois(a)			Ameren
Beginning balance at January 1	$	13	$	16	$	29		$	16	$	34		$	50
Bad debt expense	9		29		38			5		4		(b)	9
Net write-offs	(9)		(27)		(36)			(8)		(22)			(30)
Ending balance at December 31	$	13	$	18	$	31		$	13	$	16		$	29

(a)Ameren Illinois has rate-adjustment mechanisms that allow it to recover the difference between its actual net bad debt write-offs under GAAP, including those associated with receivables purchased from alternative retail electric suppliers, and the amount of net bad debt write-offs included in its base rates.

(b)In 2021, Ameren Illinois’ bad debt expense was reduced as a result of state funding received for customer bill assistance.

Schedule of Inventories

The following table presents the components of inventories for each of the Ameren Companies at December 31, 2022 and 2021:


	December 31, 2022						December 31, 2021
	Ameren Missouri		Ameren Illinois		Ameren		Ameren Missouri		Ameren Illinois		Ameren
Fuel(a)	$	79	$	—	$	79	$	118	$	—	$	118
Natural gas stored underground	10		120		130		9		90		99
Materials, supplies, and other	345		113		458		292		83		375
Total inventories	$	434	$	233	$	667	$	419	$	173	$	592

(a)Consists of coal, oil, and propane.

Schedule of Asset Retirement Obligations

The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the years ended December 31, 2022 and 2021:


	December 31, 2022									December 31, 2021
	Ameren Missouri			Ameren Illinois			Ameren			Ameren Missouri			Ameren Illinois			Ameren
Beginning balance at January 1	$	760	(a)	$	4	(b)	$	764	(a)	$	751		$	5		$	756
Liabilities incurred	1			—			1			18		(c)	—			18		(c)
Liabilities settled	(4)			—			(4)			(36)			(1)			(37)
Accretion(d)	32			—			32			31			—			31
Change in estimates	(7)			—			(7)			(4)			—			(4)
Ending balance at December 31	$	782	(a)(e)	$	4	(b)	$	786	(a)(e)	$	760	(a)	$	4	(b)	$	764	(a)

(a)Balance included $23 million and $7 million in “Other current liabilities” on the balance sheet as of December 31, 2022 and 2021, respectively.

(b)Included in “Other deferred credits and liabilities” on the balance sheet.

(c)Ameren Missouri recorded an ARO related to the decommissioning of the Atchison Renewable Energy Center in 2021.

(d)Accretion expense attributable to Ameren Missouri was recorded as a decrease to regulatory liabilities.

(e)The balance as of December 31, 2022, included an ARO related to the decommissioning of the Callaway Enter Center of $601 million.

Schedule of Excise Taxes

The following table presents the excise taxes recorded on a gross basis in “Operating Revenues – Electric,” “Operating Revenues – Natural gas” and “Operating Expenses – Taxes other than income taxes” on the statements of income for the years ended December 31, 2022, 2021, and 2020:


	2022		2021		2020
Ameren Missouri	$	162	$	150	$	139
Ameren Illinois	133		125		115
Ameren	$	295	$	275	$	254

Schedule of Rates and Amounts For Allowance for Funds Used During Construction

The following table presents the average rate that was applied to eligible construction work in progress and the amounts of allowance for funds used during construction capitalized in 2022, 2021, and 2020:


	2022			2021			2020
Average rate:
Ameren Missouri	5		%	6		%	5		%
Ameren Illinois	5		%	5		%	5		%
Ameren:
Allowance for equity funds used during construction	$	43		$	43		$	32
Allowance for borrowed funds used during construction	26			17			16
Total Ameren	$	69		$	60		$	48
Ameren Missouri:
Allowance for equity funds used during construction	$	24		$	26		$	19
Allowance for borrowed funds used during construction	13			10			10
Total Ameren Missouri	$	37		$	36		$	29
Ameren Illinois:
Allowance for equity funds used during construction	$	18		$	17		$	13
Allowance for borrowed funds used during construction	12			7			6
Total Ameren Illinois	$	30		$	24		$	19

Schedule of Earnings Per Share, Basic and Diluted

The following table reconciles the weighted-average number of common shares outstanding to the diluted weighted-average number of common shares outstanding for the years ended December 31, 2022, 2021, and 2020:


	2022	2021	2020


Weighted-average Common Shares Outstanding – Basic	258.4	256.3	247.0
Assumed settlement of performance share units and restricted stock units	1.0	1.3	1.2
Dilutive effect of forward sale agreements	0.1	—	0.5
Weighted-average Common Shares Outstanding – Diluted(a)	259.5	257.6	248.7

(a)There was an immaterial number of anti-dilutive securities excluded from the earnings per diluted share calculations for the years ended December 31, 2022 and 2021. There were no potentially dilutive securities excluded from the earnings per diluted share calculations for the year ended December 31, 2020.

Schedule of Cash Flow, Supplemental Disclosures

The following table provides noncash financing and investing activity excluded from the statements of cash flows for the years ended December 31, 2022, 2021, and 2020:


	December 31, 2022						December 31, 2021							December 31, 2020
	Ameren		Ameren Missouri		Ameren Illinois			Ameren		Ameren Missouri		Ameren Illinois			Ameren		Ameren Missouri		Ameren Illinois
Investing
Accrued capital expenditures, including nuclear fuel expenditures	$	441	$	243	$	181		$	524	$	301	$	215		$	446	$	229	$	218


Net realized and unrealized gain (loss) – nuclear decommissioning trust fund	(218)		(218)		—			163		163		—			116		116		—
Financing
Issuance of common stock for stock-based compensation	$	31	$	—	$	—		$	33	$	—	$	—		$	38	$	—	$	—
Issuance of common stock under the DRPlus	8		—		—			—		—		—			—		—		—