CMS Energy Corporation Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ 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
Beginning of period (in shares) at Dec. 31, 2020		288,940
Total Equity at Beginning of Period at Dec. 31, 2020	$ 6,077	$ 3	$ 5,365	$ (86)	$ (80)	$ (6)	$ 214	$ 0	$ 581
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (in shares)		997
Common stock issued			50					224
Common stock repurchased (in shares)		(157)
Common stock repurchased			(9)
Common stock reacquired (in shares)		(22)
Common stock reacquired			0
Net gain arising during the period	19				19
Settlement arising during the period	1				1
Amortization of net actuarial loss	5				5
Amortization of prior service credit	(1)				(1)
Unrealized gain on derivative instruments	2					2
Reclassification adjustments included in net income	1					1
Net Income	1,330						1,353		(23)
Dividends declared on common stock							(505)
Dividends declared on preferred stock							(5)
Sale of membership interest in VIE to tax equity investor									0
Contribution from noncontrolling interest									1
Distributions and other changes in noncontrolling interests									(2)
Total Equity at End of Period at Dec. 31, 2021	$ 7,188	$ 3	5,406	(59)	(56)	(3)	1,057	224	557
End of period (in shares) at Dec. 31, 2021		289,758
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 1.7400
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.5688
Common stock issued (in shares)		1,704
Common stock issued			93					0
Common stock repurchased (in shares)		(151)
Common stock repurchased			(9)
Common stock reacquired (in shares)		(43)
Common stock reacquired			0
Net gain arising during the period	$ 1				1
Settlement arising during the period	0				0
Amortization of net actuarial loss	4				4
Amortization of prior service credit	(1)				(1)
Unrealized gain on derivative instruments	2					2
Reclassification adjustments included in net income	1					1
Net Income	813						837		(24)
Dividends declared on common stock							(534)
Dividends declared on preferred stock							(10)
Sale of membership interest in VIE to tax equity investor									49
Contribution from noncontrolling interest									2
Distributions and other changes in noncontrolling interests									(4)
Total Equity at End of Period at Dec. 31, 2022	$ 7,595	$ 3	5,490	(52)	(52)	0	1,350	224	580
End of period (in shares) at Dec. 31, 2022	291,300	291,268
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 1.8400
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 1.0500
Common stock issued (in shares)		3,355
Common stock issued			222					0
Common stock repurchased (in shares)		(119)
Common stock repurchased			(7)
Common stock reacquired (in shares)		(64)
Common stock reacquired			0
Net gain arising during the period	$ 5				5
Settlement arising during the period	0				0
Amortization of net actuarial loss	2				2
Amortization of prior service credit	(1)				(1)
Unrealized gain on derivative instruments	0					0
Reclassification adjustments included in net income	0					0
Net Income	808						887		(79)
Dividends declared on common stock							(569)
Dividends declared on preferred stock							(10)
Sale of membership interest in VIE to tax equity investor									86
Contribution from noncontrolling interest									6
Distributions and other changes in noncontrolling interests									(12)
Total Equity at End of Period at Dec. 31, 2023	$ 8,125	$ 3	$ 5,705	$ (46)	$ (46)	$ 0	$ 1,658	$ 224	$ 581
End of period (in shares) at Dec. 31, 2023	294,400	294,440
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 1.9500
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 1.0500