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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Assets    
Derivative instruments $ 2 $ 1
Liabilities    
Derivative instruments 20 8
Consumers Energy Company    
Assets    
Derivative instruments 2 1
Liabilities    
Derivative instruments 1 0
Fair Value, Inputs, Level 1    
Assets    
Restricted cash equivalents 39 17
Nonqualified deferred compensation plan assets 20 18
Liabilities    
Nonqualified deferred compensation plan liabilities 20 18
Fair Value, Inputs, Level 1 | Consumers Energy Company    
Assets    
Restricted cash equivalents 24 17
Nonqualified deferred compensation plan assets 16 14
Liabilities    
Nonqualified deferred compensation plan liabilities 16 14
Fair Value, Inputs, Level 1 | Common Stock | Consumers Energy Company    
Assets    
CMS Energy common stock 1 1
Fair Value, Inputs, Level 1, 2 and 3    
Assets    
Total 61 36
Liabilities    
Total 40 26
Fair Value, Inputs, Level 1, 2 and 3 | Consumers Energy Company    
Assets    
Total 43 33
Liabilities    
Total $ 17 $ 14