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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense – plant, property, and equipment | $ 1,050 | $ 990 | $ 975
Total depreciation and amortization expense | 1,180 | 1,126 | 1,114
Securitized regulatory assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 33 | 28 | 27
Software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 92 | 103 | 108
Other intangible assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 5 | 5 | 4
Consumers Energy Company |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense – plant, property, and equipment | 1,007 | 952 | 938
Total depreciation and amortization expense | 1,137 | 1,088 | 1,077
Consumers Energy Company | Securitized regulatory assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 33 | 28 | 27
Consumers Energy Company | Software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 92 | 103 | 108
Consumers Energy Company | Other intangible assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | $ 5 | $ 5 | $ 4

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