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Notes Receivable (Narrative) (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Total unsecured consumer installment loans, net of an allowance for loan losses$ 439[1]$ 386[1]
EnerBank's Loans classified as current Notes receivable6270
EnerBank's Loans classified as noncurrent Notes receivable430397
EnerBank USA [Member]
  
Total unsecured consumer installment loans, net of an allowance for loan losses439386
Allowance for loan losses55
EnerBank's Loans classified as current Notes receivable1611
EnerBank's Loans classified as noncurrent Notes receivable$ 423$ 375
[1]1 Includes current portion of notes receivable of $16 million at September 30, 2011 and $11 million at December 31, 2010.