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Plant, Property, and Equipment (Schedule Of Plant, Property, and Equipment) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Plant, property, and equipment, gross | $ 29,893 | $ 27,870 | $ 25,368
Construction work in progress | 961 | 1,085 |
Accumulated depreciation and amortization | (8,502) | (7,938) |
Total plant, property, and equipment | 22,352 | 21,017 |
Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Plant, property, and equipment, gross | 28,771 | 26,757 | 24,963
Assets under finance leases and other financing | 332 | 336 | $ 340
Construction work in progress | 915 | 1,058 |
Accumulated depreciation and amortization | (8,371) | (7,844) |
Total plant, property, and equipment | 21,315 | 19,971 |
Plant additions | 2,400 | 2,000 |
Plant retirements | $ 361 | 220 |
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 | $ 6,704 | 6,376 |
Generation | Consumers Energy Company | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, generation | 22 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 | $ 9,815 | 9,130 |
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 | 75 years |  |
Other | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Other | $ 1,309 | 1,326 |
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 | 50 years |  |
Assets under finance leases and other financing | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Assets under finance leases and other financing | $ 319 | 323 |
Distribution | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Distribution | $ 6,338 | 5,702 |
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 | $ 2,319 | 2,003 |
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 | $ 1,117 | 1,046 |
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 | $ 814 | 817 |
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 | 50 years |  |
Finance leases | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Assets under finance leases and other financing | $ 13 | 13 |
Other non-utility property | Consumers Energy Company |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Other non-utility property | $ 23 | 21 |
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 |
Enterprises independent power production |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Plant, property, and equipment, gross | $ 1,121 | 1,112 |
Enterprises independent power production | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, Enterprises | 2 years |  |
Enterprises independent power production | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, Enterprises | 40 years |  |
Enterprises Other |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Plant, property, and equipment, gross | $ 1 | $ 1 |
Enterprises Other | Minimum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, Enterprises | 3 years |  |
Enterprises Other | Maximum |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated depreciable life in years, Enterprises | 5 years |  |

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