Schedule II - Valuation And Qualifying Accounts

12 Months Ended

Dec. 31, 2022

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Valuation And Qualifying Accounts

SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS FOR THE YEARS ENDED DECEMBER 31, 2022, 2021, AND 2020
(In millions)
Column A	Column B		Column C				Column D		Column E
Description	Balance at Beginning of Period		(1) Charged to Costs and Expenses		(2) Charged to Other Accounts(a)		Deductions(b)		Balance at End of Period
Ameren:
Deducted from assets – allowance for doubtful accounts:
2022	$	29	$	34	$	4	$	36	$	31
2021	50		9		—		30		29
2020	17		42		6		15		50
Ameren Missouri:
Deducted from assets – allowance for doubtful accounts:
2022	$	13	$	9	$	—	$	9	$	13
2021	16		5		—		8		13
2020	7		15		—		6		16
Ameren Illinois:
Deducted from assets – allowance for doubtful accounts:
2022	$	16	$	25	$	4	$	27	$	18
2021	34		4		—		22		16
2020	10		27		6		9		34

(a)Amounts associated with the allowance for doubtful accounts relate to the uncollectible account reserve associated with receivables purchased by Ameren Illinois from alternative retail electric suppliers, as required by the Illinois Public Utilities Act.

(b)Uncollectible accounts charged off, less recoveries.