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 (Accumulated Deficit)	Noncontrolling Interests	Consumers Energy Company	Consumers Energy Company Common Stock	Consumers Energy Company Other Paid-in Capital	Consumers Energy Company Accumulated Other Comprehensive Loss	Consumers Energy Company Retirement benefits liability	Consumers Energy Company Retained Earnings (Accumulated Deficit)	Consumers Energy Company Preferred Stock
Total Equity at Beginning of Period at Dec. 31, 2018	$ 4,792	$ 3	$ 5,088	$ (65)	$ (63)	$ (2)	$ (271)	$ 37	$ 6,920	$ 841	$ 4,699	$ (21)	$ (21)	$ 1,364	$ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			7
Common stock repurchased			(8)
Stockholder contribution											350
Amortization of net actuarial loss	1				1				0
Amortization of prior service credit	(1)				(1)
Unrealized loss on derivative instruments	(1)					(1)
Net income	213						213		226					226
Dividends declared on common stock							(108)							(172)
Total Equity at End of Period at Mar. 31, 2019	$ 4,895	3	5,087	(66)	(63)	(3)	(166)	37	7,324	841	5,049	(21)	(21)	1,418	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 0.3825
Total Equity at Beginning of Period at Dec. 31, 2019	$ 5,055	3	5,113	(73)	(69)	(4)	(25)	37	7,737	841	5,374	(28)	(28)	1,513	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued			106
Common stock repurchased			(12)
Stockholder contribution											350
Amortization of net actuarial loss	1				1				0
Amortization of prior service credit	0				0
Unrealized loss on derivative instruments	(4)					(4)
Net income	243						243		235					235
Dividends declared on common stock							(116)							(219)
Total Equity at End of Period at Mar. 31, 2020	$ 5,222	$ 3	$ 5,207	$ (76)	$ (68)	$ (8)	$ 51	$ 37	$ 8,103	$ 841	$ 5,724	$ (28)	$ (28)	$ 1,529	$ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (in dollars per share)	$ 0.4075