CMS Energy Corporation Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 808	$ 813	$ 1,330
Retirement Benefits Liability
Net gain arising during the period	5	1	19
Settlement arising during the period	0	0	1
Amortization of net actuarial loss, net of tax	2	4	5
Amortization of prior service credit	(1)	(1)	(1)
Derivatives
Unrealized gain on derivative instruments, net of tax	0	2	2
Reclassification adjustments included in net income	0	(1)	(1)
Other Comprehensive Income	6	7	27
Comprehensive Income	814	820	1,357
Comprehensive Loss Attributable to Noncontrolling Interests	(79)	(24)	(23)
Comprehensive Income Attributable to CMS Energy	$ 893	$ 844	$ 1,380