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Notes Receivable (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable $ 135 $ 128
EnerBank notes receivable held for sale 16 16
EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
EnerBank notes receivable held for sale 16 16
Unearned income 83 82
Delinquent loans 8 8
Loans modified as troubled debt restructurings $ 1 $ 1