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Notes Receivable (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Sale of notes receivable $ 48  
Current notes receivable 119 $ 98
EnerBank notes receivable held for sale 17 41
EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Sale of notes receivable 48  
Current notes receivable 136 138
EnerBank notes receivable held for sale 17 41
Delinquent loans 6 5
Loans modified as troubled debt restructurings $ 1 $ 1