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, 2022	$ 7,595	$ 3	$ 5,490		$ (52)	$ 1,350	$ 224	$ 580
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			32
Common stock repurchased			(7)
Net gain arising during the period	1				1
Amortization of net actuarial loss	1				1
Amortization of prior service credit	(1)				(1)
Net income (loss)	557					578		(21)
Dividends declared on common stock						(426)
Dividends declared on preferred stock						(7)
Sale of membership interest in VIE to tax equity investor								17
Other changes in noncontrolling interests								(4)
Total Equity at End of Period at Sep. 30, 2023	$ 7,758	3	5,515	$ (51)		1,495	224	572
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 1.4625
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.7875
Total Equity at Beginning of Period at Jun. 30, 2023	$ 7,706	3	5,506		(51)	1,463		561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			9
Common stock repurchased			0
Net gain arising during the period	0				0
Amortization of net actuarial loss	0				0
Amortization of prior service credit	0				0
Net income (loss)	173					176		(3)
Dividends declared on common stock						(142)
Dividends declared on preferred stock						(2)
Sale of membership interest in VIE to tax equity investor								17
Other changes in noncontrolling interests								(3)
Total Equity at End of Period at Sep. 30, 2023	$ 7,758	3	5,515	(51)		1,495	224	572
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 0.4875
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.2625
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)
Net gain arising during the period	0				0
Amortization of net actuarial loss	1				1
Amortization of prior service credit	0				0
Net income (loss)	692					738		(46)
Dividends declared on common stock						(461)
Dividends declared on preferred stock						(7)
Sale of membership interest in VIE to tax equity investor								0
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		538
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			10
Common stock repurchased			0
Net gain arising during the period	0				0
Amortization of net actuarial loss	0				0
Amortization of prior service credit	0				$ 0
Net income (loss)	247					253		(6)
Dividends declared on common stock						(153)
Dividends declared on preferred stock						(2)
Sale of membership interest in VIE to tax equity investor								0
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