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Cash and Cash Equivalents (Schedule Of Cash And Cash Equivalents, Including Restricted Amounts) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 168 $ 452    
Restricted cash and cash equivalents 27 24    
Cash and cash equivalents, including restricted amounts 195 476 $ 236 $ 185
Consumers Energy Company        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 83 22    
Restricted cash and cash equivalents 27 22    
Cash and cash equivalents, including restricted amounts $ 110 $ 44 $ 55 $ 35