Schedule II - Valuation And Qualifying Accounts

12 Months Ended

Dec. 31, 2019

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, 2019, 2018, AND 2017
(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:
2019	$	18	$	26			$	4	$	31	$	17
2018	19		27				4		32		18
2017	19		26				7		33		19
Deferred tax valuation allowance:
2019	$	5	$	(2	)		$	—	$	—	$	3
2018	5		—				—		—		5
2017	11		(6		)	(c)	—		—		5
Ameren Missouri:
Deducted from assets – allowance for doubtful accounts:
2019	$	7	$	9			$	—	$	9	$	7
2018	7		9				—		9		7
2017	7		9				—		9		7
Ameren Illinois:
Deducted from assets – allowance for doubtful accounts:
2019	$	11	$	17			$	4	$	22	$	10
2018	12		18				4		23		11
2017	12		17				7		24		12

(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.

(c)

Includes an adjustment of $3 million to Ameren (parent)’s valuation allowance for certain deferred tax assets existing at December 31, 2017, for the reduction in the income tax rate.