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Plant, Property, and Equipment (Summary of Accumulated Depreciation and Amortization) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | $ 9,007 | $ 8,960
Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Consumers accumulated depreciation and amortization | 8,796 | 8,791
Non-utility plant assets |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | 217 | 175
Non-utility plant assets | Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Consumers accumulated depreciation and amortization | 6 | 6
Utility plant assets |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | 8,790 | 8,785
Utility plant assets | Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Consumers accumulated depreciation and amortization | $ 8,790 | $ 8,785

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