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Plant, Property, and Equipment (Schedule of Finite-Lived Intangible Assets by Major Class Table) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | $ 1,102 | $ 1,105
Accumulated Amortization | 684 | 658
Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 1,102 | 1,104
Accumulated Amortization | 684 | 658
Plant additions | 2,400 | 2,000
Plant retirements | 361 | 220
Software development |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 840 | 856
Accumulated Amortization | 592 | 568
Software development | Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 840 | 856
Accumulated Amortization | 592 | 568
Leasehold improvements |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 9 | 10
Accumulated Amortization | 6 | 7
Leasehold improvements | Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 9 | 10
Accumulated Amortization | 6 | 7
Intangible Plant | Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Plant additions | 88 | 69
Plant retirements | 91 | 65
Rights of way |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 211 | 197
Accumulated Amortization | 60 | 57
Rights of way | Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 211 | 197
Accumulated Amortization | 60 | 57
Franchises and consents |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 16 | 16
Accumulated Amortization | 10 | 10
Franchises and consents | Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 16 | 16
Accumulated Amortization | 10 | 10
Other intangible assets |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 26 | 26
Accumulated Amortization | 16 | 16
Other intangible assets | Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Gross cost | 26 | 25
Accumulated Amortization | $ 16 | $ 16
Minimum | Software development |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Amortization Life in Years | 3 years |
Minimum | Software development | Consumers Energy Company |  |
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 | Rights of way | Consumers Energy Company |  |
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 |
Minimum | Franchises and consents | Consumers Energy Company |  |
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 | Software development | Consumers Energy Company |  |
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 | Rights of way | Consumers Energy Company |  |
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 |
Maximum | Franchises and consents | Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Amortization Life in Years | 50 years |

X
- 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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