Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2023

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

Valuation and Qualifying Accounts

Constellation Energy Corporation and Subsidiary Companies

Constellation Energy Generation, LLC and Subsidiary Companies

Schedule II – Valuation and Qualifying Accounts

			Additions and adjustments
Description	Balance at Beginning of Period		Charged to Costs and Expenses			Charged to Other Accounts		Deductions			Balance at End of Period
(In millions)
For the year ended December 31, 2023
Allowance for credit losses	$	51	$	25		$	—	$	(15)	(a)	$	61
Deferred tax valuation allowance	11		—			(1)		—			10
Reserve for obsolete materials	238		8			9		(9)			246
For the year ended December 31, 2022
Allowance for credit losses	$	59	$	10		$	—	$	(18)	(a)	$	51
Deferred tax valuation allowance	22		—			(11)		—			11
Reserve for obsolete materials	250		11			(6)		(17)			238
For the year ended December 31, 2021
Allowance for credit losses	$	32	$	34		$	—	$	(7)	(a)	$	59
Deferred tax valuation allowance	23		—			(1)		—			22
Reserve for obsolete materials	265		(6)		(b)	(2)		(7)			250

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(a)Write-offs, net of recoveries of individual accounts receivable.

(b)Primarily reflects expense resulting from materials and supplies inventory reserve adjustments as a result of the decision to early retire Byron, Dresden, and Mystic 8 and 9. See Note 7—Early Plant Retirements of the Combined Notes to Consolidated Financial Statements for additional information.