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)	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 Retained Earnings	Consumers Energy Company Cumulative Preferred Stock
Total Equity at Beginning of Period at Dec. 31, 2023	$ 8,125	$ 3	$ 5,705		$ 1,658	$ 224	$ 10,800	$ 841	$ 7,759	$ (15)	$ 2,178	$ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution									320
Return of stockholder contribution									(320)
Net Income	287						275				275
Dividends declared on common stock					(154)						(265)
Total Equity at End of Period at Mar. 31, 2024	8,506	3	5,975	$ (45)	1,789	224	10,810	841	7,759	(15)	2,188	37
Total Equity at Beginning of Period at Dec. 31, 2024	8,748	3	6,009		2,035	224	11,431	841	8,174	(11)	2,390	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution									150
Return of stockholder contribution									0
Net Income	304						346				346
Dividends declared on common stock					(163)						(271)
Total Equity at End of Period at Mar. 31, 2025	$ 8,923	$ 3	$ 5,975	$ (41)	$ 2,174	$ 224	$ 11,656	$ 841	$ 8,324	$ (11)	$ 2,465	$ 37