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Notes Receivable (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Jul. 31, 2018
EnerBank      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable $ 2,018 $ 1,857  
Unearned income 111 102  
Delinquent loans 20 21  
Loans modified as troubled debt restructurings 1 1  
Consumers Energy Company      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable 105 106  
Current portion notes receivable related party 7 $ 7  
Retail Installment Contracts | EnerBank      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable 131    
Interest Rate Swap Notes Receivable | EnerBank      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest rate swap $ 36    
CMS Energy Note Payable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest Rate     4.10%