CMS Energy Corporation Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 163	$ 183	$ 650	$ 696
Retirement Benefits Liability
Net gain (loss) arising during the period	(1)	0	1	0
Amortization of net actuarial loss, net of tax	1	1	3	5
Amortization of prior service credit	0	0	0	(1)
Derivatives
Unrealized gain on derivative instruments, net of tax	0	0	2	1
Reclassification adjustments included in net income	0	0	1	0
Other Comprehensive Income	0	1	7	5
Comprehensive Income	163	184	657	701
Comprehensive Loss Attributable to Noncontrolling Interests	(2)	(6)	(16)	(18)
Comprehensive Income Attributable to CMS Energy	$ 165	$ 190	$ 673	$ 719