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Plant, Property, and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Plant, property, and equipment, gross | $ 34,932 | $ 33,135 |
Assets under finance leases | 176 | 136 | $ 170
Construction work in progress | 2,098 | 944 |
Accumulated depreciation and amortization | (9,569) | (9,007) |
Total plant, property, and equipment | 27,461 | 25,072 |
Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Plant, property, and equipment, gross | 33,434 | 31,723 |
Assets under finance leases | 131 | 112 | $ 146
Construction work in progress | 1,766 | 845 |
Accumulated depreciation and amortization | (9,310) | (8,796) |
Total plant, property, and equipment | 25,890 | 23,772 |
Plant additions | 2,100 | 3,100 |
Plant retirements | $ 390 | 856 |
Consumers Energy Company | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, consumers | 3 years |  |
Consumers Energy Company | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, consumers | 125 years |  |
Generation | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Generation | $ 6,576 | 6,511 |
Generation | Consumers Energy Company | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, generation | 15 years |  |
Generation | Consumers Energy Company | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, generation | 125 years |  |
Distribution | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Distribution | $ 12,135 | 11,339 |
Distribution | Consumers Energy Company | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, distribution | 15 years |  |
Distribution | Consumers Energy Company | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, distribution | 75 years |  |
Other | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Other | $ 1,307 | 1,355 |
Other | Consumers Energy Company | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, other | 5 years |  |
Other | Consumers Energy Company | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, other | 55 years |  |
Assets under finance leases | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Assets under finance leases | $ 119 | 97 |
Distribution | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Distribution | $ 7,942 | 7,452 |
Distribution | Consumers Energy Company | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, distribution | 20 years |  |
Distribution | Consumers Energy Company | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, distribution | 85 years |  |
Transmission | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Transmission | $ 3,081 | 2,806 |
Transmission | Consumers Energy Company | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, transmission | 17 years |  |
Transmission | Consumers Energy Company | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, transmission | 75 years |  |
Underground storage facilities | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Other | $ 1,405 | 1,295 |
Underground storage facilities | Consumers Energy Company | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, other | 29 years |  |
Underground storage facilities | Consumers Energy Company | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, other | 75 years |  |
Other | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Other | $ 828 | 815 |
Other | Consumers Energy Company | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, other | 5 years |  |
Other | Consumers Energy Company | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, other | 55 years |  |
Finance leases | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Assets under finance leases | $ 12 | 15 |
Other non-utility property | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Other non-utility property | $ 29 | 38 |
Other non-utility property | Consumers Energy Company | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, other | 3 years |  |
Other non-utility property | Consumers Energy Company | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, other | 51 years |  |
Natural Gas | Underground storage facilities | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Other | $ 26 | 26 |
NorthStar Clean Energy |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Assets under finance leases | 45 | 24 |
Independent power production |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Plant, property, and equipment, gross | $ 1,452 | 1,387 |
Independent power production | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, Enterprises | 3 years |  |
Independent power production | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, Enterprises | 40 years |  |
Other |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Plant, property, and equipment, gross | $ 1 | $ 1 |
Other | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, Enterprises | 3 years |  |
Other | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, Enterprises | 5 years |  |

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