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Notes Receivable (Narrative) (Details) - USD ($)
$ in Millions
Jul. 26, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable   $ 1,437 $ 1,371
EnerBank      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unearned income   85 84
Delinquent loans   13 14
Loans modified as troubled debt restructurings   $ 1 $ 1
Retail Installment Contracts | Subsequent Event | EnerBank      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable $ 81