CMS Energy Corporation Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 947	$ 808	$ 813
Retirement Benefits Liability
Net gain arising during the period	2	5	1
Prior service credit adjustment	1	0	0
Amortization of net actuarial loss	2	2	4
Amortization of prior service credit	0	(1)	(1)
Derivatives
Unrealized gain on investments	0	0	2
Reclassification adjustments included in net income	0	0	1
Other Comprehensive Income	5	6	7
Comprehensive Income	952	814	820
Comprehensive Loss Attributable to Noncontrolling Interests	(56)	(79)	(24)
Comprehensive Income	$ 1,008	$ 893	$ 844