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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Assets    
Restricted cash equivalents $ 27 $ 24
Derivative instruments 3 2
Liabilities    
Derivative instruments 0 7
Consumers Energy Company    
Assets    
Restricted cash equivalents 27 22
Derivative instruments 3 2
Liabilities    
Derivative instruments 0 0
Fair Value, Inputs, Level 1    
Assets    
Restricted cash equivalents 27 24
Nonqualified deferred compensation plan assets 22 27
Liabilities    
Nonqualified deferred compensation plan liabilities 22 27
Fair Value, Inputs, Level 1 | Consumers Energy Company    
Assets    
Restricted cash equivalents 27 22
Nonqualified deferred compensation plan assets 17 21
Liabilities    
Nonqualified deferred compensation plan liabilities 17 21
Fair Value, Inputs, Level 1, 2 and 3    
Assets    
Total assets 52 53
Liabilities    
Total liabilities 22 34
Fair Value, Inputs, Level 1, 2 and 3 | Consumers Energy Company    
Assets    
Total assets 47 45
Liabilities    
Total liabilities $ 17 $ 21