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Supplemental Information (Tables)

12 Months Ended

Dec. 31, 2021

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, 2021 and 2020:


	December 31, 2021						December 31, 2020
	Ameren		Ameren Missouri		Ameren Illinois		Ameren		Ameren Missouri		Ameren Illinois
Cash and cash equivalents	$	8	$	—	$	—	$	139	$	136	$	—
Restricted cash included in “Other current assets”	16		4		6		17		5		6
Restricted cash included in “Other assets”	127		—		127		141		—		141
Restricted cash included in “Nuclear decommissioning trust fund”	4		4		—		4		4		—
Total cash, cash equivalents, and restricted cash	$	155	$	8	$	133	$	301	$	145	$	147

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, 2021 and 2020:


(In millions)	2021		2020
Cash and cash equivalents	$	—	$	—
Restricted cash included in “Other current assets”	4		4
Total cash, cash equivalents, and restricted cash	$	4	$	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, 2021 and 2020:


	December 31, 2021							December 31, 2020
	Ameren Missouri		Ameren Illinois(a)			Ameren		Ameren Missouri		Ameren Illinois(a)		Ameren
Beginning of period	$	16	$	34		$	50	$	7	$	10	$	17
Bad debt expense	5		4		(b)	9		15		33		48

Net write-offs	(8)		(22)			(30)		(6)		(9)		(15)
End of period	$	13	$	16		$	29	$	16	$	34	$	50

(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 incremental state funding received for customer bill assistance. The incremental state funding granted relief to low-income customers at risk of service disconnection resulting from the impacts of the COVID-19 pandemic.

Schedule of Inventories

The following table presents the components of inventories for each of the Ameren Companies at December 31, 2021 and 2020:


	December 31, 2021						December 31, 2020
	Ameren Missouri		Ameren Illinois		Ameren		Ameren Missouri		Ameren Illinois		Ameren
Fuel(a)	$	118	$	—	$	118	$	115	$	—	$	115
Natural gas stored underground	9		90		99		5		52		57
Materials, supplies, and other	292		83		375		266		83		349
Total inventories	$	419	$	173	$	592	$	386	$	135	$	521

(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, 2021 and 2020:


	December 31, 2021									December 31, 2020
	Ameren Missouri			Ameren Illinois			Ameren				Ameren Missouri			Ameren Illinois			Ameren
Beginning balance at January 1	$	751		$	5	(a)	$	756	(b)		$	687		$	4		$	691
Liabilities incurred	18		(c)	—			18		(c)		36		(c)	—			36		(c)
Liabilities settled	(36)			(1)			(37)				(58)			—			(58)
Accretion(d)	31			—			31				29			1			30
Change in estimates	(4)		(e)	—			(4)		(e)		57		(f)	—			57		(f)
Ending balance at December 31	$	760	(g)	$	4	(a)	$	764	(b)(g)		$	751		$	5	(a)	$	756	(b)

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

(b)Balance included $7 million and $60 million in “Other current liabilities” on the balance sheet as of December 31, 2021 and 2020, respectively.

(c)Ameren Missouri recorded AROs related to the decommissioning of the Atchison Renewable and High Prairie Renewable energy centers in 2021 and 2020, respectively.

(d)Accretion expense attributable to Ameren Missouri and Ameren Illinois was recorded as a decrease to regulatory liabilities and an increase to regulatory assets, respectively.

(e)Ameren Missouri changed its fair value estimate primarily due to a decrease in the cost estimate for closure of certain CCR storage facilities, partially offset by an increase due to the planned accelerated retirement of the Rush Island Energy Center.

(f)Ameren Missouri changed its fair value estimate primarily due to an update to the decommissioning of the Callaway Energy Center to reflect the cost study and funding analysis filed with the MoPSC in November 2020 and an increase in the cost estimate for closure of certain CCR storage facilities.

(g)The balance as of December 31, 2021, included an ARO related to the decommissioning of the Callaway Enter Center of $574 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, 2021, 2020, and 2019:


	2021		2020		2019
Ameren Missouri	$	150	$	139	$	147
Ameren Illinois	125		115		117
Ameren	$	275	$	254	$	264

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 2021, 2020, and 2019:


	2021			2020			2019
Average rate:
Ameren Missouri	6		%	5		%	6		%
Ameren Illinois	5		%	5		%	5		%
Ameren:
Allowance for equity funds used during construction	$	43		$	32		$	28
Allowance for borrowed funds used during construction	17			16			20
Total Ameren	$	60		$	48		$	48
Ameren Missouri:
Allowance for equity funds used during construction	$	26		$	19		$	19
Allowance for borrowed funds used during construction	10			10			12
Total Ameren Missouri	$	36		$	29		$	31
Ameren Illinois:
Allowance for equity funds used during construction	$	17		$	13		$	9
Allowance for borrowed funds used during construction	7			6			8
Total Ameren Illinois	$	24		$	19		$	17

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, 2021, 2020, and 2019:


	2021	2020	2019


Weighted-average Common Shares Outstanding – Basic	256.3	247.0	245.6
Assumed settlement of performance share units and restricted stock units	1.3	1.2	1.4
Dilutive effect of forward sale agreements	—	0.5	0.1
Weighted-average Common Shares Outstanding – Diluted(a)	257.6	248.7	247.1

(a)There was an immaterial number of anti-dilutive securities excluded from the earnings per diluted share calculations for the year ended December 31, 2021. There were no potentially dilutive securities excluded from the earnings per diluted share calculations for the years ended December 31, 2020 and 2019.

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, 2021, 2020, and 2019:


	December 31, 2021						December 31, 2020							December 31, 2019
	Ameren		Ameren Missouri		Ameren Illinois			Ameren		Ameren Missouri		Ameren Illinois			Ameren		Ameren Missouri		Ameren Illinois
Investing
Accrued capital expenditures, including wind generation expenditures	$	508	$	285	$	215		$	446	$	229	$	218		$	333	$	140	$	163
Accrued nuclear fuel expenditures	16		16		—			—		—		—			19		19		—

Net realized and unrealized gain – nuclear decommissioning trust fund	163		163		—			116		116		—			143		143		—
Exchange of bond investments for the extinguishment of senior unsecured notes(a)	—		—		—			—		—		—			17		—		17
Financing
Issuance of common stock for stock-based compensation	$	33	$	—	$	—		$	38	$	—	$	—		$	54	$	—	$	—
Exchange of bond investments for the extinguishment of senior unsecured notes(a)	—		—		—			—		—		—			(17)		—		(17)

(a)In 2006, Ameren Illinois purchased all $17 million of the 1993 Series B-1 bonds due 2028 issued by the Illinois Finance Authority on behalf of Ameren Illinois pursuant to a mandatory tender. Ameren Illinois’ 1993 Series B-1 senior unsecured notes due 2028 were not extinguished and remained as “Long-term debt, net” on Ameren’s and Ameren Illinois’ balance sheets. In September 2019, Ameren Illinois exchanged its bond investments for the extinguishment of its senior unsecured notes.