CMS Energy Corporation Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net Income	$ 1,002	$ 947	$ 808
Retirement Benefits Liability
Net gain arising during the period	4	2	5
Prior service credit adjustment	0	1	0
Amortization of net actuarial loss	2	2	2
Amortization of prior service credit	(1)	0	(1)
Other Comprehensive Income	5	5	6
Comprehensive Income	1,007	952	814
Comprehensive Loss Attributable to Noncontrolling Interests	(69)	(56)	(79)
Comprehensive Income	$ 1,076	$ 1,008	$ 893