Consumers Energy Company Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Stock	Other Paid-in Capital	Accumulated Other Comprehensive Loss	Retirement benefits liability	Retained Earnings (Accumulated Deficit)	Cumulative Preferred Stock	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 Cumulative Preferred Stock
Total Equity at Beginning of Period at Dec. 31, 2018	$ 4,792	$ 3	$ 5,088	$ (65)	$ (63)	$ (271)	$ 0	$ 6,920	$ 841	$ 4,699	$ (21)	$ (21)	$ 1,364	$ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										675
Net gain (loss) arising during the period	(7)				(7)			(8)				(8)
Amortization of net actuarial loss	3				3			1				1
Net Income	682					680		743					743
Dividends declared on common stock						(434)							(592)
Dividends declared on preferred stock						0							(2)
Total Equity at End of Period at Dec. 31, 2019	5,055	3	5,113	(73)	(69)	(25)	0	7,737	841	5,374	(28)	(28)	1,513	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										650
Net gain (loss) arising during the period	(15)				(15)			(9)				(9)
Amortization of net actuarial loss	5				5			1				1
Net Income	752					755		816					816
Dividends declared on common stock						(465)							(637)
Dividends declared on preferred stock						0							(2)
Total Equity at End of Period at Dec. 31, 2020	6,077	3	5,365	(86)	(80)	214	0	8,556	841	6,024	(36)	(36)	1,690	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										575
Net gain (loss) arising during the period	19				19			2				2
Amortization of net actuarial loss	5				5			2				2
Net Income	1,330					1,353		868					868
Dividends declared on common stock						(505)							(722)
Dividends declared on preferred stock						(5)							(2)
Total Equity at End of Period at Dec. 31, 2021	$ 7,188	$ 3	$ 5,406	$ (59)	$ (56)	$ 1,057	$ 224	$ 9,279	$ 841	$ 6,599	$ (32)	$ (32)	$ 1,834	$ 37