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Plant, Property, and Equipment (Schedule Of Estimated Amortization Expense For Intangibles) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
2017 $ 115
2018 120
2019 112
2020 95
2021 77
Consumers Energy Company [Member]  
2017 114
2018 119
2019 111
2020 94
2021 $ 77