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	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, 2021	$ 7,188	$ 3	$ 5,406	$ (59)	$ (56)	$ 1,057	$ 224	$ 9,279	$ 841	$ 6,599		$ (32)	$ 1,834	$ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										685
Return of stockholder contribution										0
Net gain arising during the period	1				1			15				15
Amortization of net actuarial loss	4				4			2				2
Net Income	837							945					945
Dividends declared on common stock						(534)							(769)
Dividends declared on preferred stock						(10)							(2)
Total Equity at End of Period at Dec. 31, 2022	7,595	3	5,490	(52)	(52)	1,350	224	10,155	841	7,284	$ (15)	(15)	2,008	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										475
Return of stockholder contribution										0
Net gain arising during the period	5				5			(1)				(1)
Amortization of net actuarial loss	2				2			1				1
Net Income	887							867					867
Dividends declared on common stock						(569)							(695)
Dividends declared on preferred stock						(10)							(2)
Total Equity at End of Period at Dec. 31, 2023	8,125	3	5,705	(46)	(46)	1,658	224	10,800	841	7,759	(15)	(15)	2,178	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										735
Return of stockholder contribution										(320)
Net gain arising during the period	2				2			3				3
Amortization of net actuarial loss	2				2			1				$ 1
Net Income	1,003							1,009					1,009
Dividends declared on common stock						(616)							(795)
Dividends declared on preferred stock						(10)							(2)
Total Equity at End of Period at Dec. 31, 2024	$ 8,748	$ 3	$ 6,009	$ (41)	$ (41)	$ 2,035	$ 224	$ 11,431	$ 841	$ 8,174	$ (11)		$ 2,390	$ 37