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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (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
Total notes receivable 1,175 1,161
EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
EnerBank notes receivable held for sale 16 16
Noncurrent notes receivable 1,024 1,017
Receivables, Net Of Allowance For Loan Losses [Member] | EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable $ 135 $ 128