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Plant, Property, and Equipment (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Property, Plant and Equipment [Line Items] |  |
Finance lease accumulated amortization | $ 57 | $ 65
Consumers Energy Company |  |
Property, Plant and Equipment [Line Items] |  |
Finance lease accumulated amortization | $ 55 | $ 64

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