CMS Energy Corporation Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 813	$ 1,330	$ 752
Retirement Benefits Liability
Net gain (loss) arising during the period	1	19	(15)
Settlement arising during the period	0	1	1
Prior service credit adjustment	0	0	(1)
Amortization of net actuarial loss, net of tax	4	5	5
Amortization of prior service credit	(1)	(1)	(1)
Derivatives
Unrealized gain on derivative instruments, net of tax	2	2	(4)
Reclassification adjustments included in net income	1	1	2
Other Comprehensive Income (Loss)	7	27	(13)
Comprehensive Income	820	1,357	739
Comprehensive Loss Attributable to Noncontrolling Interests	(24)	(23)	(3)
Comprehensive Income Attributable to CMS Energy	$ 844	$ 1,380	$ 742