Consumers Energy Company 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 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	Consumers Energy Company Cumulative Preferred Stock
Total Equity at Beginning of Period at Dec. 31, 2020	$ 6,077	$ 3	$ 5,365	$ (86)	$ (80)	$ 214		$ 8,556	$ 841	$ 6,024		$ (36)	$ 1,690	$ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										150
Amortization of net actuarial loss	1				1			0				0
Net Income	342					349		336					336
Dividends declared on common stock						(126)							(276)
Total Equity at End of Period at Mar. 31, 2021	6,302	3	5,371	(84)	(79)	437	$ 0	8,766	841	6,174	$ (36)		1,750	37
Total Equity at Beginning of Period at Dec. 31, 2021	7,188	3	5,406	(59)	(56)	1,057		9,279	841	6,599		(32)	1,834	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										450
Amortization of net actuarial loss	1				1			1				$ 1
Net Income	345					353		383					383
Dividends declared on common stock						(133)							(275)
Total Equity at End of Period at Mar. 31, 2022	$ 7,405	$ 3	$ 5,406	$ (54)	$ (53)	$ 1,275	$ 224	$ 9,838	$ 841	$ 7,049	$ (31)		$ 1,942	$ 37