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	Retained Earnings	Cumulative Redeemable Perpetual Preferred Stock, Series C	Noncontrolling Interests
Total Equity at Beginning of Period at Dec. 31, 2022	$ 7,595	$ 3	$ 5,490		$ (52)	$ 1,350	$ 224	$ 580
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			23
Common stock repurchased			(7)
Net gain arising during the period	1				1
Amortization of net actuarial loss	1				1
Amortization of prior service credit	(1)				(1)
Net income (loss)	384					402		(18)
Dividends declared on common stock						(284)
Dividends declared on preferred stock						(5)
Other changes in noncontrolling interests								(1)
Total Equity at End of Period at Jun. 30, 2023	$ 7,706	3	5,506	$ (51)		1,463	224	561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 0.9750
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.5250
Total Equity at Beginning of Period at Mar. 31, 2023	$ 7,652	3	5,494		(51)	1,410		572
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			12
Common stock repurchased			0
Net gain arising during the period	0				0
Amortization of net actuarial loss	1				1
Amortization of prior service credit	(1)				(1)
Net income (loss)	190					198		(8)
Dividends declared on common stock						(142)
Dividends declared on preferred stock						(3)
Other changes in noncontrolling interests								(3)
Total Equity at End of Period at Jun. 30, 2023	$ 7,706	3	5,506	(51)		1,463	224	561
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
Total Equity at Beginning of Period at Dec. 31, 2023	$ 8,125	3	5,705		(46)	1,658	224	581
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			297
Common stock repurchased			(11)
Net gain arising during the period	0				0
Amortization of net actuarial loss	1				1
Amortization of prior service credit	0				0
Net income (loss)	445					485		(40)
Dividends declared on common stock						(308)
Dividends declared on preferred stock						(5)
Other changes in noncontrolling interests								(3)
Total Equity at End of Period at Jun. 30, 2024	$ 8,541	3	5,991	(45)		1,830	224	538
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 1.0300
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.5250
Total Equity at Beginning of Period at Mar. 31, 2024	$ 8,506	3	5,975		(45)	1,789		560
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			16
Common stock repurchased			0
Net gain arising during the period	0				0
Amortization of net actuarial loss	0				0
Amortization of prior service credit	0				$ 0
Net income (loss)	182					198		(16)
Dividends declared on common stock						(154)
Dividends declared on preferred stock						(3)
Other changes in noncontrolling interests								(6)
Total Equity at End of Period at Jun. 30, 2024	$ 8,541	$ 3	$ 5,991	$ (45)		$ 1,830	$ 224	$ 538
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 0.5150
Dividends declared per preferred stock Series C depositary share (in dollars per share)	$ 0.2625