CMS Energy Corporation Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 190	$ 142	$ 384	$ 487
Retirement Benefits Liability
Net gain arising during the period	0	0	1	2
Amortization of net actuarial loss, net of tax	1	1	1	2
Amortization of prior service credit	(1)	0	(1)	0
Derivatives
Unrealized gain on derivative instruments, net of tax	0	0	0	2
Reclassification adjustments included in net income	0	(1)	0	(1)
Other Comprehensive Income	0	2	1	7
Comprehensive Income	190	144	385	494
Comprehensive Loss Attributable to Noncontrolling Interests	(8)	(6)	(18)	(14)
Comprehensive Income Attributable to CMS Energy	$ 198	$ 150	$ 403	$ 508