CMS Energy Corporation Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 345	$ 342
Retirement Benefits Liability
Net gain arising during the period	2	0
Amortization of net actuarial loss, net of tax	1	1
Derivatives
Unrealized gain on derivative instruments, net of tax of $1 and $—	2	1
Other Comprehensive Income	5	2
Comprehensive Income	350	344
Comprehensive Loss Attributable to Noncontrolling Interests	(8)	(7)
Comprehensive Income Attributable to CMS Energy	$ 358	$ 351