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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, 2023 | Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | $ 1,052 | $ 1,114
Accumulated Amortization | 640 | 686
Plant additions | 3,100 | 2,300
Plant retirements | 856 | 290
Software development |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 772 | 846
Accumulated Amortization | 543 | 593
Leasehold improvements |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 11 | 9
Accumulated Amortization | 7 | 6
Intangible plant |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Plant additions | 80 | 116
Plant retirements | 142 | 104
Rights of way |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 229 | 218
Accumulated Amortization | 64 | 61
Franchises and consents |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 16 | 16
Accumulated Amortization | 11 | 10
Other intangible assets |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 24 | 25
Accumulated Amortization | $ 15 | $ 16
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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