CMS Energy Corporation Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 173	$ 163	$ 557	$ 650
Retirement Benefits Liability
Net gain (loss) arising during the period	0	(1)	1	1
Amortization of net actuarial loss, net of tax	0	1	1	3
Amortization of prior service credit	0	0	(1)	0
Derivatives
Unrealized gain on derivative instruments, net of tax	0	0	0	2
Reclassification adjustments included in net income	0	0	0	(1)
Other Comprehensive Income	0	0	1	7
Comprehensive Income	173	163	558	657
Comprehensive Loss Attributable to Noncontrolling Interests	(3)	(2)	(21)	(16)
Comprehensive Income Attributable to CMS Energy	$ 176	$ 165	$ 579	$ 673