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Plant, Property, and Equipment (Summary of Finite-Lived Intangible Assets by Major Class) (Details) - Consumers Energy Company - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | $ 989 | $ 1,052
Accumulated Amortization | 583 | 640
Plant additions | 2,100 | 3,100
Plant retirements | 390 | 856
Software development |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 679 | 772
Accumulated Amortization | 481 | 543
Leasehold improvements |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 13 | 11
Accumulated Amortization | 7 | 7
Intangible plant |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Plant additions | 90 | 80
Plant retirements | 153 | 142
Rights of way |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 253 | 229
Accumulated Amortization | 68 | 64
Franchises and consents |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 16 | 16
Accumulated Amortization | 11 | 11
Other intangible assets |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 28 | 24
Accumulated Amortization | $ 16 | $ 15
Minimum | Software development |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Amortization Life in Years | 3 years |
Minimum | Rights of way |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Amortization Life in Years | 50 years |
Minimum | Franchises and consents |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Amortization Life in Years | 5 years |
Maximum | Software development |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Amortization Life in Years | 15 years |
Maximum | Rights of way |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Amortization Life in Years | 85 years |
Maximum | Franchises and consents |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Amortization Life in Years | 50 years |

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- Definition Current year acquisitions of long-lived assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, certain intangible assets, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
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