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		$ 581
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			33
Common stock repurchased			(9)
Net gain 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	1					1
Reclassification adjustments included in net income	0					0
Net Income	513						525		(12)
Dividends declared on common stock							(252)
Dividends declared on preferred stock							0
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 Jun. 30, 2021	$ 6,366	3	5,389	(82)	(77)	(5)	487	$ 0	569
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 0.8700
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0
Total Equity at Beginning of Period at Mar. 31, 2021	$ 6,302	3	5,371	(84)	(79)	(5)	437		575
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			18
Common stock repurchased			0
Net gain arising during the period	0				0
Amortization of net actuarial loss	3				3
Amortization of prior service credit	(1)				(1)
Unrealized gain on derivative instruments	0					0
Reclassification adjustments included in net income	0					0
Net Income	171						176		(5)
Dividends declared on common stock							(126)
Dividends declared on preferred stock							0
Sale of membership interest in VIE to tax equity investor									0
Contribution from noncontrolling interest									0
Distributions and other changes in noncontrolling interests									(1)
Total Equity at End of Period at Jun. 30, 2021	$ 6,366	3	5,389	(82)	(77)	(5)	487	0	569
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
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			21
Common stock repurchased			(10)
Net gain arising during the period	2				2
Amortization of net actuarial loss	2				2
Amortization of prior service credit	0				0
Unrealized gain on derivative instruments	2					2
Reclassification adjustments included in net income	(1)					(1)
Net Income	487						501		(14)
Dividends declared on common stock							(267)
Dividends declared on preferred stock							(5)
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 Jun. 30, 2022	$ 7,471	3	5,417	(52)	(52)	0	1,286	224	593
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 0.9200
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.5250
Total Equity at Beginning of Period at Mar. 31, 2022	$ 7,405	3	5,406	(54)	(53)	(1)	1,275		551
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			11
Common stock repurchased			0
Net gain 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	(1)					(1)
Net Income	142						148		(6)
Dividends declared on common stock							(134)
Dividends declared on preferred stock							(3)
Sale of membership interest in VIE to tax equity investor									49
Contribution from noncontrolling interest									0
Distributions and other changes in noncontrolling interests									(1)
Total Equity at End 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]
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