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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Assets    
Restricted cash and cash equivalents $ 27 $ 17
Derivative instruments 0 1
Liabilities    
Derivative instruments 19 8
Consumers Energy Company    
Assets    
Restricted cash and cash equivalents 24 17
Derivative instruments 0 1
Liabilities    
Derivative instruments 0 0
Fair Value, Inputs, Level 1    
Assets    
Cash equivalents 91 0
Restricted cash and cash equivalents 27 17
Nonqualified deferred compensation plan assets 17 18
Liabilities    
Nonqualified deferred compensation plan liabilities 17 18
Fair Value, Inputs, Level 1 | Consumers Energy Company    
Assets    
Cash equivalents 0 0
Restricted cash and cash equivalents 24 17
Nonqualified deferred compensation plan assets 13 14
Liabilities    
Nonqualified deferred compensation plan liabilities 13 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 135 36
Liabilities    
Total 36 26
Fair Value, Inputs, Level 1, 2 and 3 | Consumers Energy Company    
Assets    
Total 38 33
Liabilities    
Total $ 13 $ 14