CMS Energy Corporation Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Other Paid-in Capital	Accumulated Other Comprehensive Loss	Retirement benefits liability	Retained Earnings	Cumulative Redeemable Perpetual Preferred Stock, Series C	Noncontrolling Interests
Total Equity at Beginning of Period at Dec. 31, 2023	$ 8,125	$ 3	$ 5,705		$ (46)	$ 1,658	$ 224	$ 581
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			307
Common stock repurchased			(11)
Sale of membership interests in VIEs			0					0
Amortization of net actuarial loss	1				1
Amortization of prior service credit	0				0
Net Income	692					738		(46)
Dividends declared on common stock						(461)
Dividends declared on preferred stock						(7)
Other changes in noncontrolling interests								(5)
Total Equity at End of Period at Sep. 30, 2024	$ 8,641	3	6,001	$ (45)		1,928	224	530
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 1.5450
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.7875
Total Equity at Beginning of Period at Jun. 30, 2024	$ 8,541	3	5,991		(45)	1,830	224	538
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			10
Common stock repurchased			0
Sale of membership interests in VIEs			0					0
Amortization of net actuarial loss	0				0
Amortization of prior service credit	0				0
Net Income	247					253		(6)
Dividends declared on common stock						(153)
Dividends declared on preferred stock						(2)
Other changes in noncontrolling interests								(2)
Total Equity at End of Period at Sep. 30, 2024	$ 8,641	3	6,001	(45)		1,928	224	530
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 0.5150
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.2625
Total Equity at Beginning of Period at Dec. 31, 2024	$ 8,748	3	6,009		(41)	2,035	224	518
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			393
Common stock repurchased			(13)
Sale of membership interests in VIEs			(34)					78
Amortization of net actuarial loss	1				1
Amortization of prior service credit	(1)				(1)
Net Income	760					782		(22)
Dividends declared on common stock						(487)
Dividends declared on preferred stock						(7)
Other changes in noncontrolling interests								(7)
Total Equity at End of Period at Sep. 30, 2025	$ 9,431	3	6,355	(41)		2,323	224	567
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 1.6275
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.7875
Total Equity at Beginning of Period at Jun. 30, 2025	$ 8,971	3	5,998		(41)	2,210	224	577
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			358
Common stock repurchased			(1)
Sale of membership interests in VIEs			0					0
Amortization of net actuarial loss	1				1
Amortization of prior service credit	(1)				$ (1)
Net Income	272					277		(5)
Dividends declared on common stock						(162)
Dividends declared on preferred stock						(2)
Other changes in noncontrolling interests								(5)
Total Equity at End of Period at Sep. 30, 2025	$ 9,431	$ 3	$ 6,355	$ (41)		$ 2,323	$ 224	$ 567
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 0.5425
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.2625