Plant, Property, and Equipment (Summary of Average Capitalization Rates) (Details) - Consumers Energy Company	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Electric Utility
Property, Plant and Equipment [Line Items]
AFUDC capitalization rate	6.90%	6.90%	6.50%
Gas Utility
Property, Plant and Equipment [Line Items]
AFUDC capitalization rate	5.90%	5.80%	5.80%

Effective rate, including composite rate, of cost of financing additions to qualifying regulated assets, commonly called allowance for funds used during construction.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 980
-SubTopic 835
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478698/980-835-25-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 980
-SubTopic 835
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479123/980-835-45-1

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration