v3.25.4

Plant, Property, and Equipment (Summary of Depreciation and Amortization Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense – plant, property, and equipment | $ 1,099 | $ 1,041 | $ 1,050
Total depreciation and amortization expense | 1,306 | 1,240 | 1,180
Other regulatory assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 8 | 2 | 0
Securitized regulatory assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 117 | 111 | 33
Software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 75 | 81 | 92
Other intangible assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 7 | 5 | 5
Consumers Energy Company |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense – plant, property, and equipment | 1,047 | 992 | 1,007
Total depreciation and amortization expense | 1,254 | 1,191 | 1,137
Consumers Energy Company | Other regulatory assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 8 | 2 | 0
Consumers Energy Company | Securitized regulatory assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 117 | 111 | 33
Consumers Energy Company | Software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 75 | 81 | 92
Consumers Energy Company | Other intangible assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | $ 7 | $ 5 | $ 5

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