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Plant, Property, and Equipment (Summary of Depreciation and Amortization Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense – plant, property, and equipment | $ 1,041 | $ 1,050 | $ 990
Total depreciation and amortization expense | 1,240 | 1,180 | 1,126
Other regulatory assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 2 | 0 | 0
Securitized regulatory assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 111 | 33 | 28
Software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 81 | 92 | 103
Other intangible assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 5 | 5 | 5
Consumers Energy Company |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense – plant, property, and equipment | 992 | 1,007 | 952
Total depreciation and amortization expense | 1,191 | 1,137 | 1,088
Consumers Energy Company | Other regulatory assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 2 | 0 | 0
Consumers Energy Company | Securitized regulatory assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 111 | 33 | 28
Consumers Energy Company | Software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 81 | 92 | 103
Consumers Energy Company | Other intangible assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | $ 5 | $ 5 | $ 5

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