Supplemental Information (Tables)

9 Months Ended

Sep. 30, 2022

Supplemental Information [Abstract]

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 September 30, 2022, and December 31, 2021:

	September 30, 2022						December 31, 2021
	Ameren		Ameren Missouri		Ameren Illinois		Ameren		Ameren Missouri		Ameren Illinois
“Cash and cash equivalents”	$	7	$	—	$	—	$	8	$	—	$	—
Restricted cash included in “Other current assets”	7		3		4		16		4		6
Restricted cash included in “Other assets”	162		—		162		127		—		127
Restricted cash included in “Nuclear decommissioning trust fund”	4		4		—		4		4		—
Total cash, cash equivalents, and restricted cash	$	180	$	7	$	166	$	155	$	8	$	133

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 and nine months ended September 30, 2022 and 2021:

	Three Months				Nine Months
	2022		2021		2022		2021
Ameren:
Beginning of period	$	30	$	42	$	29	$	50
Bad debt expense	15		7		26		8
Net write-offs	(14)		(13)		(24)		(22)
End of period	$	31	$	36	$	31	$	36
Ameren Missouri:
Beginning of period	$	12	$	16	$	13	$	16
Bad debt expense	3		2		6		5
Net write-offs	(3)		(4)		(7)		(7)
End of period	$	12	$	14	$	12	$	14
Ameren Illinois:(a)
Beginning of period	$	18	$	26	$	16	$	34
Bad debt expense	12		5		20		3		(b)
Net write-offs	(11)		(9)		(17)		(15)
End of period	$	19	$	22	$	19	$	22

(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 the nine months ended September 30, 2021, Ameren Illinois’ bad debt expense was reduced as a result of state funding received for customer bill assistance.

Schedule of Cash Flow, Supplemental Disclosures

The following table provides noncash financing and investing activity excluded from the statements of cash flows for the nine months ended September 30, 2022 and 2021:

	September 30, 2022						September 30, 2021
	Ameren		Ameren Missouri		Ameren Illinois		Ameren		Ameren Missouri		Ameren Illinois
Investing
Accrued capital expenditures	$	367	$	187	$	180	$	396	$	209	$	182
Net realized and unrealized gain/(loss) – nuclear decommissioning trust fund	(262)		(262)		—		85		85		—
Financing
Issuance of common stock for stock-based compensation	$	31	$	—	$	—	$	33	$	—	$	—
Issuance of common stock under the DRPlus	8		—		—		—		—		—

Asset Retirement Obligation Disclosure

The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the nine months ended September 30, 2022:

	Ameren Missouri			Ameren Illinois			Ameren
Balance at December 31, 2021	$	760	(a)	$	4	(b)	$	764	(a)
Liabilities incurred	1			—			1
Liabilities settled	(3)			—			(3)
Accretion	23		(c)	—			23		(c)
Change in estimates	(7)			—			(7)
Balance at September 30, 2022	$	774	(a)	$	4	(b)	$	778	(a)

(a)Balance included $7 million in “Other current liabilities” on the balance sheet as of both September 30, 2022, and December 31, 2021.

(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 and nine months ended September 30, 2022 and 2021:

	Three Months				Nine Months
	2022		2021		2022		2021
Ameren Missouri	$	55	$	54	$	128	$	120
Ameren Illinois	28		27		101		93
Ameren	$	83	$	81	$	229	$	213

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 and nine months ended September 30, 2022 and 2021:

	Three Months		Nine Months
	2022	2021	2022	2021
Weighted-average Common Shares Outstanding – Basic	258.4	257.3	258.2	255.9
Assumed settlement of performance share units and restricted stock units	0.9	1.3	1.0	1.3
Dilutive effect of forward sale agreements	0.2	—	0.1	—
Weighted-average Common Shares Outstanding – Diluted(a)	259.5	258.6	259.3	257.2

(a)There was an immaterial number of anti-dilutive securities excluded from the earnings per diluted share calculations for the three and nine months ended September 30, 2022 and 2021.