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Supplemental Information (Tables)

3 Months Ended

Mar. 31, 2023

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 at March 31, 2023, and December 31, 2022:


	March 31, 2023						December 31, 2022
	Ameren		Ameren Missouri		Ameren Illinois		Ameren		Ameren Missouri		Ameren Illinois
“Cash and cash equivalents”	$	10	$	3	$	—	$	10	$	—	$	—

Restricted cash included in “Other current assets”	13		5		6		13		5		6
Restricted cash included in “Other assets”	211		—		211		185		—		185
Restricted cash included in “Nuclear decommissioning trust fund”	3		3		—		8		8		—
Total cash, cash equivalents, and restricted cash	$	237	$	11	$	217	$	216	$	13	$	191

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 three months ended March 31, 2023 and 2022:


	Three Months
		2023		2022
Ameren:
Beginning of period		$	31	$	29
Bad debt expense		10		4
Net write-offs		(7)		(5)
End of period		$	34	$	28
Ameren Missouri:
Beginning of period		$	13	$	13
Bad debt expense		2		1
Net write-offs		(3)		(3)
End of period		$	12	$	11
Ameren Illinois:(a)
Beginning of period		$	18	$	16
Bad debt expense		8		3
Net write-offs		(4)		(2)
End of period		$	22	$	17

(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.

Schedule of Cash Flow, Supplemental Disclosures

The following table provides noncash financing and investing activity excluded from the statements of cash flows for the three months ended March 31, 2023 and 2022:


	March 31, 2023						March 31, 2022
	Ameren		Ameren Missouri				Ameren Illinois	Ameren		Ameren Missouri		Ameren Illinois
Investing:
Accrued capital expenditures	$	298	$	153	$	138		$	345	$	194	$	147

Net realized and unrealized gain/(loss) – nuclear decommissioning trust fund	54		54		—			(71)		(71)		—
Return of investment in industrial development revenue bonds(a)	240		240		—			—		—		—
Financing:
Issuance of common stock for stock-based compensation	$	37	$	—	$	—		$	31	$	—	$	—
Issuance of common stock under the DRPlus	7		—		—			8		—		—
Termination of a financing obligation(a)	240		240		—			—		—		—

(a)In January 2023, Ameren Missouri and Audrain County mutually agreed to terminate a financing obligation agreement related to the CT energy center in Audrain County, which was scheduled to expire in December 2023. No cash was exchanged in connection with the termination of the agreement as the $240 million principal amount of the financing obligation due from Ameren Missouri was equal to the amount of bond service payments due to Ameren Missouri.

Asset Retirement Obligation Disclosure

The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the three months ended March 31, 2023:


	Ameren Missouri			Ameren Illinois			Ameren
Balance at December 31, 2022	$	782	(a)	$	4	(b)	$	786	(a)

Liabilities settled	(2)			—			(2)
Accretion	8		(c)	—			8		(c)

Balance at March 31, 2023	$	788	(a)	$	4	(b)	$	792	(a)

(a)Balance included $23 million in “Other current liabilities” on the balance sheet as of both March 31, 2023, and December 31, 2022.

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

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

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 three months ended March 31, 2023 and 2022:


	Three Months
		2023		2022
Ameren Missouri		$	34	$	34
Ameren Illinois		37		45
Ameren		$	71	$	79

Schedule of Earnings Per Share, Basic and Diluted

The following table reconciles the basic weighted-average number of common shares outstanding to the diluted weighted-average number of common shares outstanding for the three months ended March 31, 2023 and 2022:


	Three Months
		2023	2022


Weighted-average Common Shares Outstanding – Basic		262.2	257.9
Assumed settlement of performance share units and restricted stock units		0.9	1.1

Weighted-average Common Shares Outstanding – Diluted(a)		263.1	259.0

(a)There was an immaterial number of anti-dilutive performance share units excluded from the earnings per diluted share calculations for the three months ended March 31, 2023 and 2022. The outstanding forward sale agreements as of March 31, 2023, were anti-dilutive and excluded from the earnings per diluted share calculation as calculated using the treasury stock method.