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Notes Receivable (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable $ 1,640 $ 1,371
EnerBank notes receivable held for sale 26 2
EnerBank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unearned income 82 84
Delinquent loans 15 14
Loans modified as troubled debt restructurings 1 $ 1
EnerBank notes receivable held for sale 26  
Receivable Held For Sale | EnerBank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unearned income 6  
Retail Installment Contracts | EnerBank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable $ 77