Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net income	$ 137	$ 94	$ 380	$ 307
Retirement Benefits Liability
Amortization of net actuarial loss, net of tax	1	1	2	2
Amortization of prior service credit	(1)	0	(1)	(1)
Derivatives
Unrealized loss on derivative instruments, net of tax of $-, $(1), $(1), and $(1)	0	(2)	(4)	(3)
Other Comprehensive Loss	0	(1)	(3)	(2)
Comprehensive Income	137	93	377	305
Comprehensive Income Attributable to Noncontrolling Interests	1	1	1	1
Comprehensive Income Attributable to CMS Energy	136	92	376	304
Consumers Energy Company
Net income	160	98	395	324
Retirement Benefits Liability
Amortization of net actuarial loss, net of tax	0	1	0	1
Derivatives
Other Comprehensive Loss	0	1	0	1
Comprehensive Income	$ 160	$ 99	$ 395	$ 325