CMS Energy Corporation Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 142	$ 171	$ 487	$ 513
Retirement Benefits Liability
Net gain arising during the period	0	0	2	0
Amortization of net actuarial loss, net of tax	1	3	2	4
Amortization of prior service credit	0	(1)	0	(1)
Derivatives
Unrealized gain on derivative instruments, net of tax	0	0	2	1
Reclassification adjustments included in net income	(1)	0	(1)	0
Other Comprehensive Income	2	2	7	4
Comprehensive Income	144	173	494	517
Comprehensive Loss Attributable to Noncontrolling Interests	(6)	(5)	(14)	(12)
Comprehensive Income Attributable to CMS Energy	$ 150	$ 178	$ 508	$ 529