v3.25.4

Plant, Property, and Equipment (Schedule of Property, Plant and Equipment) (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 facility | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Plant, property, and equipment, gross |  | $ 37,763 | $ 34,932 |
Assets under finance leases |  | 193 | 176 | $ 136
Construction work in progress |  | 3,052 | 2,098 |
Accumulated depreciation and amortization |  | (10,135) | (9,569) |
Total plant, property, and equipment |  | 30,680 | 27,461 |
Facilities agreed to sell | facility | 13 |  |  |
Consumers Energy Company |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Plant, property, and equipment, gross |  | 36,120 | 33,434 |
Assets under finance leases |  | 138 | 131 | $ 112
Construction work in progress |  | 2,354 | 1,766 |
Accumulated depreciation and amortization |  | (9,842) | (9,310) |
Total plant, property, and equipment |  | 28,632 | 25,890 |
Plant additions |  | 3,100 | 2,100 |
Plant retirements |  | 387 | 390 |
Impairment of assets |  | 20 |  |
Consumers Energy Company | Renewable Natural Gas Development Projects |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Impairment of assets |  | $ 15 |  |
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 |  | $ 7,171 | 6,576 |
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 |  | $ 13,360 | 12,135 |
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 |  | $ 1,209 | 1,307 |
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 |  | $ 131 | 119 |
Distribution | Consumers Energy Company |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Distribution |  | $ 8,553 | 7,942 |
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 |  | $ 3,236 | 3,081 |
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 |  | $ 1,535 | 1,405 |
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 |  | $ 886 | 828 |
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 |  | $ 8 | 12 |
Other non-utility property | Consumers Energy Company |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Other non-utility property |  | $ 31 | 29 |
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 |  | $ 24 | 26 |
NorthStar Clean Energy |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Assets under finance leases |  | 55 | 45 |
Independent power production |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Plant, property, and equipment, gross |  | $ 1,585 | 1,452 |
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 |  | $ 3 | $ 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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