CMS Energy Corporation Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net Income	$ 272	$ 247	$ 760	$ 692
Retirement Benefits Liability
Amortization of net actuarial loss	1	0	1	1
Amortization of prior service credit	(1)	0	(1)	0
Other Comprehensive Income	0	0	0	1
Comprehensive Income	272	247	760	693
Comprehensive Loss Attributable to Noncontrolling Interests	(5)	(6)	(22)	(46)
Comprehensive Income	$ 277	$ 253	$ 782	$ 739