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Financings and Capitalization Financings and Capitalization (Debt Retirements) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
Debt Instrument [Line Items]  
Redemption of debt $ 725
Consumers Energy Company  
Debt Instrument [Line Items]  
Redemption of debt 725
Consumers Energy Company | First Mortgage Bonds due October 2020  
Debt Instrument [Line Items]  
Redemption of debt $ 100
Interest Rate 3.77%
Consumers Energy Company | First Mortgage Bonds Due September 2022  
Debt Instrument [Line Items]  
Redemption of debt $ 250
Interest Rate 5.30%
Consumers Energy Company | First Mortgage Bonds Due May 2022  
Debt Instrument [Line Items]  
Redemption of debt $ 375
Interest Rate 2.85%