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	Derivative instruments	Retained Earnings	Cumulative Preferred Stock	Noncontrolling Interests
Total Equity at Beginning of Period at Dec. 31, 2021	$ 7,188	$ 3	$ 5,406	$ (59)	$ (56)	$ (3)	$ 1,057		$ 557
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			27
Common stock repurchased			(10)
Net gain (loss) arising during the period	1				1
Amortization of net actuarial loss	3				3
Amortization of prior service credit	0				0
Unrealized gain on derivative instruments	2					2
Reclassification adjustments included in net income	1					1
Net Income	650						666		(16)
Dividends declared on common stock							(401)
Dividends declared on preferred stock							(7)
Sale of membership interest in VIE to tax equity investor									49
Contribution from noncontrolling interest									2
Distributions and other changes in noncontrolling interests									(1)
Total Equity at End of Period at Sep. 30, 2022	$ 7,504	3	5,423	(52)	(52)	0	1,315	$ 224	591
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 1.3800
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.7875
Total Equity at Beginning of Period at Jun. 30, 2022	$ 7,471	3	5,417	(52)	(52)	0	1,286		593
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			6
Common stock repurchased			0
Net gain (loss) arising during the period	(1)				(1)
Amortization of net actuarial loss	1				1
Amortization of prior service credit	0				0
Unrealized gain on derivative instruments	0					0
Reclassification adjustments included in net income	0					0
Net Income	163						165		(2)
Dividends declared on common stock							(134)
Dividends declared on preferred stock							(2)
Sale of membership interest in VIE to tax equity investor									0
Contribution from noncontrolling interest									0
Distributions and other changes in noncontrolling interests									0
Total Equity at End of Period at Sep. 30, 2022	$ 7,504	3	5,423	(52)	(52)	0	1,315	224	591
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 0.4600
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.2625
Total Equity at Beginning of Period at Dec. 31, 2022	$ 7,595	3	5,490	(52)	(52)	0	1,350		580
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			32
Common stock repurchased			(7)
Net gain (loss) arising during the period	1				1
Amortization of net actuarial loss	1				1
Amortization of prior service credit	(1)				(1)
Unrealized gain on derivative instruments	0					0
Reclassification adjustments included in net income	0					0
Net Income	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
Contribution from noncontrolling interest									6
Distributions and other changes in noncontrolling interests									(10)
Total Equity at End of Period at Sep. 30, 2023	$ 7,758	3	5,515	(51)	(51)	0	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)	(51)	0	1,463		561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			9
Common stock repurchased			0
Net gain (loss) arising during the period	0				0
Amortization of net actuarial loss	0				0
Amortization of prior service credit	0				0
Unrealized gain on derivative instruments	0					0
Reclassification adjustments included in net income	0					0
Net Income	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
Contribution from noncontrolling interest									0
Distributions and other changes in noncontrolling interests									(3)
Total Equity at End of Period at Sep. 30, 2023	$ 7,758	$ 3	$ 5,515	$ (51)	$ (51)	$ 0	$ 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