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Plant, Property, and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Plant, property, and equipment, gross | $ 33,135 | $ 30,491 |  | $ 29,893
Assets under finance leases | 136 | 170 |  | 332
Construction work in progress | 944 | 1,182 |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | (9,007) | (8,960) |  |
Total plant, property, and equipment | 25,072 | 22,713 |  |
Regulatory assets | 3,683 | 3,595 |  |
Consumers Energy Company |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Plant, property, and equipment, gross | 31,723 | 29,342 |  | 28,771
Assets under finance leases | 112 | 146 |  | $ 332
Construction work in progress | 845 | 994 |  |
Accumulated depreciation and amortization | (8,796) | (8,791) |  |
Total plant, property, and equipment | 23,772 | 21,545 |  |
Plant additions | 3,100 | 2,300 |  |
Plant retirements | 856 | 290 |  |
Regulatory assets | $ 3,683 | 3,595 |  |
Consumers Energy Company | J.H. Campbell Generating Units |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Regulatory assets |  |  | $ 1,300 |
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 | $ 6,511 | 5,780 |  |
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 | $ 11,339 | 10,590 |  |
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 | $ 1,355 | 1,374 |  |
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 | $ 97 | 126 |  |
Distribution | Consumers Energy Company |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Distribution | $ 7,452 | 6,951 |  |
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 | $ 2,806 | 2,440 |  |
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 | $ 1,295 | 1,197 |  |
Underground storage facilities | Consumers Energy Company | Minimum |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Estimated depreciable life in years, other | 27 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 | $ 815 | 835 |  |
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 | $ 15 | 20 |  |
Other non-utility property | Consumers Energy Company |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Other non-utility property | $ 38 | 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 | $ 26 |  |  |
NorthStar Clean Energy |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Assets under finance leases | 24 | 24 |  |
Independent power production |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Plant, property, and equipment, gross | $ 1,387 | 1,124 |  |
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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