Consolidated Statement of Changes in Equity - USD ($) $ in Millions	Total	Undistributed Earnings	Accumulated Other Comprehensive Income (Loss), net	Noncontrolling Interests	Constellation Energy Generation, LLC	Constellation Energy Generation, LLC Membership Interest	Constellation Energy Generation, LLC Undistributed Earnings	Constellation Energy Generation, LLC Accumulated Other Comprehensive Income (Loss), net	Constellation Energy Generation, LLC Noncontrolling Interests
Beginning Balance at Dec. 31, 2022					$ 11,414	$ 12,408	$ 412	$ (1,760)	$ 354
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 102	$ 96		$ 6	102		96		6
Changes in equity of noncontrolling interests	(2)			(2)	(2)				(2)
Distributions to member					(249)	(152)	(97)
Other comprehensive income (loss), net of income taxes	(48)		$ (48)		(48)			(48)
Ending Balance at Mar. 31, 2023					11,217	12,256	411	(1,808)	358
Beginning Balance at Dec. 31, 2023					11,374	11,537	1,667	(2,191)	361
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	883	$ 883		$ 0	883		883		0
Distributions to member					(610)	(499)	(111)
Other comprehensive income (loss), net of income taxes	$ 11		$ 11		11			11
Ending Balance at Mar. 31, 2024					$ 11,658	$ 11,038	$ 2,439	$ (2,180)	$ 361