Consolidated Statements of Changes in Equity, Parent - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Retained Deficit	Accumulated Other Comprehensive Loss, net	Noncontrolling Interests	Predecessor Member's Equity	[1]
Beginning Balance (in shares) at Dec. 31, 2021		0
Beginning balance at Dec. 31, 2021	$ 11,614	$ 0	$ 0	$ (31)	$ 395	$ 11,250
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	151					151
Separation-related adjustments	(197)			(2,006)	7	1,802
Changes in equity of noncontrolling interests	(7)				(7)
Ending Balance (in shares) at Jan. 31, 2022		326,664
Ending balance at Jan. 31, 2022	0	$ 13,203	0	0	0	(13,203)
Beginning Balance (in shares) at Dec. 31, 2021		0
Beginning balance at Dec. 31, 2021	11,614	$ 0	0	(31)	395	11,250
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	111
Other comprehensive loss, net of income taxes	21
Ending Balance (in shares) at Mar. 31, 2022		326,699
Ending balance at Mar. 31, 2022	11,505	$ 13,212	(91)	(2,016)	400	0
Beginning Balance (in shares) at Jan. 31, 2022		326,664
Beginning balance at Jan. 31, 2022	0	$ 13,203	0	0	0	(13,203)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(40)		(45)		5
Employee incentive plan (in shares)		35
Employee incentive plans	9	$ 9
Common stock dividends	(46)		(46)
Other comprehensive loss, net of income taxes	21			21
Ending Balance (in shares) at Mar. 31, 2022		326,699
Ending balance at Mar. 31, 2022	$ 11,505	$ 13,212	(91)	(2,016)	400	$ 0
Beginning Balance (in shares) at Dec. 31, 2022	327,000	327,130
Beginning balance at Dec. 31, 2022	$ 11,372	$ 13,274	(496)	(1,760)	354
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	102		96		6
Employee incentive plan (in shares)		528
Employee incentive plans	6	$ 6
Changes in equity of noncontrolling interests	(2)				(2)
Common stock dividends	$ (93)		(93)
Common stock repurchased (in shares)	(3,200)	(3,239)
Common stock repurchased	$ (251)	$ (251)
Other comprehensive loss, net of income taxes	$ (48)			(48)
Ending Balance (in shares) at Mar. 31, 2023	324,000	324,419
Ending balance at Mar. 31, 2023	$ 11,086	$ 13,029	$ (493)	$ (1,808)	$ 358

[1] Represents Constellation’s predecessor member's equity prior to the separation transaction. Upon completion of the separation, the predecessor member's equity was transferred to CEG Parent’s Common stock. See Note 1 — Basis of Presentation for additional information on the separation.