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	$ 0	$ 8,556	$ 841	$ 6,024	$ (36)	$ (36)	$ 1,690	$ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										575
Amortization of net actuarial loss	5				5			2				2
Net Income	714							712					712
Dividends declared on common stock						(378)							(570)
Dividends declared on preferred stock						(3)							(1)
Total Equity at End of Period at Sep. 30, 2021	6,653	3	5,397	(81)	(76)	547	224	9,274	841	6,599	(34)	(34)	1,831	37
Total Equity at Beginning of Period at Jun. 30, 2021	6,366	3	5,389	(82)	(77)	487	0	8,977	841	6,299	(35)	(35)	1,835	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										300
Amortization of net actuarial loss	1				1			1				1
Net Income	189							186					186
Dividends declared on common stock						(126)							(190)
Dividends declared on preferred stock						(3)							0
Total Equity at End of Period at Sep. 30, 2021	6,653	3	5,397	(81)	(76)	547	224	9,274	841	6,599	(34)	(34)	1,831	37
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)	(32)	1,834	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										685
Amortization of net actuarial loss	3				3			2				2
Net Income	666							745					745
Dividends declared on common stock						(401)							(593)
Dividends declared on preferred stock						(7)							(1)
Total Equity at End of Period at Sep. 30, 2022	7,504	3	5,423	(52)	(52)	1,315	224	10,117	841	7,284	(30)	(30)	1,985	37
Total Equity at Beginning of Period at Jun. 30, 2022	7,471	3	5,417	(52)	(52)	1,286	224	10,087	841	7,284	(31)	(31)	1,956	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholder contribution										0
Amortization of net actuarial loss	1				1			1				1
Net Income	165							189					189
Dividends declared on common stock						(134)							(160)
Dividends declared on preferred stock						(2)							0
Total Equity at End of Period at Sep. 30, 2022	$ 7,504	$ 3	$ 5,423	$ (52)	$ (52)	$ 1,315	$ 224	$ 10,117	$ 841	$ 7,284	$ (30)	$ (30)	$ 1,985	$ 37