CMS Energy Corporation Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (91)	$ 272	$ 282	$ 760
Retirement Benefits Liability
Amortization of net actuarial loss	0	1	1	1
Amortization of prior service credit	0	(1)	0	(1)
Other Comprehensive Income	0	0	1	0
Comprehensive Income (Loss)	(91)	272	283	760
Comprehensive Loss Attributable to Noncontrolling Interests	(214)	(5)	(301)	(22)
Comprehensive Income Attributable to CMS Energy	$ 123	$ 277	$ 584	$ 782

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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