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Notes Receivable (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
EnerBank's Loans classified as current Notes receivable $ 25 $ 49
EnerBank's Loans classified as noncurrent Notes receivable 454 462
EnerBank USA [Member]
   
Total unsecured consumer installment loans, net of an allowance for loan losses 477 [1] 480 [1]
Allowance for loan losses 5 5
EnerBank's Loans classified as current Notes receivable 24 19
EnerBank's Loans classified as noncurrent Notes receivable $ 453 $ 461
[1] Includes current portion of notes receivable of $24 million at March 31, 2012 and $19 million at December 31, 2011.