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, 2020	$ 6,077	$ 3	$ 5,365	$ (86)	$ (80)	$ (6)	$ 214	$ 0	$ 581
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			41					224
Common stock repurchased			(9)
Net gain (loss) arising during the period	0				0
Amortization of net actuarial loss	5				5
Amortization of prior service credit	(1)				(1)
Unrealized gain on derivative instruments	1					1
Reclassification adjustments included in net income	0					0
Net Income	696						714		(18)
Dividends declared on common stock							(378)
Dividends declared on preferred stock							(3)
Sale of membership interest in VIE to tax equity investor									0
Contribution from noncontrolling interest									1
Distributions and other changes in noncontrolling interests									(1)
Total Equity at End of Period at Sep. 30, 2021	$ 6,653	3	5,397	(81)	(76)	(5)	547	224	563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 1.3050
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.3063
Total Equity at Beginning of Period at Jun. 30, 2021	$ 6,366	3	5,389	(82)	(77)	(5)	487	0	569
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			8					224
Common stock repurchased			0
Net gain (loss) arising during the period	0				0
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	183						189		(6)
Dividends declared on common stock							(126)
Dividends declared on preferred stock							(3)
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, 2021	$ 6,653	3	5,397	(81)	(76)	(5)	547	224	563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 0.4350
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.3063
Total Equity at Beginning of Period at Dec. 31, 2021	$ 7,188	3	5,406	(59)	(56)	(3)	1,057	224	557
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			27					0
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	224	593
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			6					0
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