The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

+ Details

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- References

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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+ Details

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Stock-based Compensation (Schedule of Restricted Stock Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Number of Shares
Granted (in shares)	521,121
Consumers Energy Company
Number of Shares
Granted (in shares)	493,232
Restricted Stock and Restricted Stock Units
Number of Shares
Nonvested, at beginning of period (in shares)	1,029,523
Nonvested, at end of period (in shares)	1,158,102	1,029,523
Weighted-Average Grant Date Fair Value per Share
Weighted-average grant date fair value per share, at beginning of period (in dollars per share)	$ 60.13
Weighted-average grant date fair value per share, at end of period (in dollars per share)	$ 59.50	$ 60.13
Restricted Stock and Restricted Stock Units \| Consumers Energy Company
Number of Shares
Nonvested, at beginning of period (in shares)	978,146
Nonvested, at end of period (in shares)	1,094,366	978,146
Weighted-Average Grant Date Fair Value per Share
Weighted-average grant date fair value per share, at beginning of period (in dollars per share)	$ 60.15
Weighted-average grant date fair value per share, at end of period (in dollars per share)	$ 59.50	$ 60.15
Restricted stock
Number of Shares
Granted (in shares)	502,039
Vested (in shares)	(313,344)
Forfeited (in shares)	(63,987)
Weighted-Average Grant Date Fair Value per Share
Granted (in dollars per share)	$ 52.62	48.69	$ 43.52
Vested (in dollars per share)	51.54
Forfeitured (in dollars per share)	$ 53.57
Restricted stock \| Consumers Energy Company
Number of Shares
Granted (in shares)	474,917
Vested (in shares)	(302,177)
Forfeited (in shares)	(60,312)
Weighted-Average Grant Date Fair Value per Share
Granted (in dollars per share)	$ 52.42	48.57	42.85
Vested (in dollars per share)	51.48
Forfeitured (in dollars per share)	$ 53.45
Restricted stock units
Number of Shares
Granted (in shares)	19,082
Vested (in shares)	(15,211)
Forfeited (in shares)	0
Weighted-Average Grant Date Fair Value per Share
Granted (in dollars per share)	$ 50.32	56.13	54.11
Vested (in dollars per share)	$ 52.60
Restricted stock units \| Consumers Energy Company
Number of Shares
Granted (in shares)	18,315
Vested (in shares)	(14,523)
Forfeited (in shares)	0
Weighted-Average Grant Date Fair Value per Share
Granted (in dollars per share)	$ 50.34	$ 56.07	$ 53.93
Vested (in dollars per share)	$ 52.55