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			15
Common stock repurchased			(9)
Net gain arising during the period	0				0
Amortization of net actuarial loss	1				1
Unrealized gain on derivative instruments	1					1
Contribution from noncontrolling interest									1
Net Income	342						349		(7)
Dividends declared on common stock							(126)
Dividends declared on preferred stock							0
Total Equity at End of Period at Mar. 31, 2021	$ 6,302	3	5,371	(84)	(79)	(5)	437	$ 0	575
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			10
Common stock repurchased			(10)
Net gain arising during the period	2				2
Amortization of net actuarial loss	1				1
Unrealized gain on derivative instruments	2					2
Contribution from noncontrolling interest									2
Net Income	345						353		(8)
Dividends declared on common stock							(133)
Dividends declared on preferred stock							(2)
Total Equity at End of Period at Mar. 31, 2022	$ 7,405	$ 3	$ 5,406	$ (54)	$ (53)	$ (1)	$ 1,275	$ 224	$ 551
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