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Plant, Property, and Equipment (Schedule Of Estimated Amortization Expense For Intangibles) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Public Utility, Property, Plant and Equipment [Line Items]  
2020 $ 118
2021 112
2022 107
2023 87
2024 70
Consumers Energy Company  
Public Utility, Property, Plant and Equipment [Line Items]  
2020 116
2021 110
2022 106
2023 87
2024 $ 70