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Plant, Property, and Equipment (Summary of Average Capitalization Rates) (Details) - Consumers Energy Company | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Electric Utility |  |  |
Property, Plant and Equipment [Line Items] |  |  |
AFUDC capitalization rate | 6.50% | 6.20% | 6.20%
Gas Utility |  |  |
Property, Plant and Equipment [Line Items] |  |  |
AFUDC capitalization rate | 5.80% | 5.60% | 5.60%

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- Definition Effective rate, including composite rate, of cost of financing additions to qualifying regulated assets, commonly called allowance for funds used during construction. + References 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//1943274/2147481668/980-835-25-1 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//1943274/2147482064/980-835-45-1 + Details
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