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Notes Receivable (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
EnerBank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable $ 2,464 $ 1,857
Unearned income 133 102
Delinquent loans 27 $ 21
Retail Installment Contracts | EnerBank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable $ 333  
CMS Energy Note Payable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Rate 4.10%