CMS Energy Corporation Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income	$ 182	$ 190	$ 445	$ 384
Retirement Benefits Liability
Net gain arising during the period	0	0	0	1
Amortization of net actuarial loss	0	1	1	1
Amortization of prior service credit	0	(1)	0	(1)
Other Comprehensive Income	0	0	1	1
Comprehensive Income	182	190	446	385
Comprehensive Loss Attributable to Noncontrolling Interests	(16)	(8)	(40)	(18)
Comprehensive Income Attributable to CMS Energy	$ 198	$ 198	$ 486	$ 403