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Plant, Property, and Equipment (Schedule Of Estimated Amortization Expense For Intangibles) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Public Utility, Property, Plant and Equipment [Line Items]  
2022 $ 108
2023 94
2024 84
2025 86
2026 84
Consumers Energy Company  
Public Utility, Property, Plant and Equipment [Line Items]  
2022 108
2023 94
2024 84
2025 86
2026 $ 84