Schedule II - Valuation And Qualifying Accounts

12 Months Ended

Dec. 31, 2024

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, 2024, 2023, AND 2022
(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:
2024	$	30	$	39	$	8	$	47	$	30
2023	31		51		5		57		30
2022	29		34		4		36		31
Ameren Missouri:
Deducted from assets – allowance for doubtful accounts:
2024	$	12	$	11	$	—	$	11	$	12
2023	13		11		—		12		12
2022	13		9		—		9		13
Ameren Illinois:
Deducted from assets – allowance for doubtful accounts:
2024	$	18	$	28	$	8	$	36	$	18
2023	18		40		5		45		18
2022	16		25		4		27		18

(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.