Consumers Energy Company Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Other Paid-in Capital	Accumulated Other Comprehensive Income (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 Income (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, 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	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
Total Equity at Beginning of Period at Dec. 31, 2022	7,595	3	5,490	(52)	(52)	1,350		10,155	841	7,284		(15)	2,008	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										75
Amortization of net actuarial loss	0				0			0				$ 0
Net Income	204							232					232
Dividends declared on common stock						(142)							(287)
Total Equity at End of Period at Mar. 31, 2023	$ 7,652	$ 3	$ 5,494	$ (51)	$ (51)	$ 1,410	$ 224	$ 10,175	$ 841	$ 7,359	$ (15)		$ 1,953	$ 37