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Notes Receivable (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Sale of notes receivable $ 48  
Current notes receivable 128 $ 98
EnerBank notes receivable held for sale 16 41
EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Sale of notes receivable 48  
Current notes receivable 144 138
Delinquent loans 8 5
Loans modified as troubled debt restructurings 1 1
Receivables Held For Sale [Member] | EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable $ 16 $ 41