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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Assets    
Restricted cash equivalents $ 17 $ 18
Derivative instruments 5 2
Consumers Energy Company    
Assets    
Restricted cash equivalents 17 17
Derivative instruments 4 2
Level 1    
Assets    
Cash equivalents 188 0
Restricted cash equivalents 17 18
Nonqualified deferred compensation plan assets 28 24
Liabilities    
Nonqualified deferred compensation plan liabilities 28 24
Level 1 | Consumers Energy Company    
Assets    
Cash equivalents 42 0
Restricted cash equivalents 17 17
Nonqualified deferred compensation plan assets 20 18
Liabilities    
Nonqualified deferred compensation plan liabilities 20 18
Fair Value, Inputs, Level 1, 2 and 3    
Assets    
Total assets 238 44
Liabilities    
Total liabilities 28 24
Fair Value, Inputs, Level 1, 2 and 3 | Consumers Energy Company    
Assets    
Total assets 83 37
Liabilities    
Total liabilities $ 20 $ 18