Consumers Energy Company Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Income	$ 837	$ 1,353	$ 755
Retirement Benefits Liability
Net gain (loss) arising during the period	1	19	(15)
Amortization of net actuarial loss, net of tax	4	5	5
Other Comprehensive Income (Loss)	7	27	(13)
Comprehensive Income Attributable to CMS Energy	844	1,380	742
Consumers Energy Company
Net Income	945	868	816
Retirement Benefits Liability
Net gain (loss) arising during the period	15	2	(9)
Amortization of net actuarial loss, net of tax	2	2	1
Other Comprehensive Income (Loss)	17	4	(8)
Comprehensive Income Attributable to CMS Energy	$ 962	$ 872	$ 808