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Notes Receivable (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Total unsecured consumer installment loans, net of an allowance for loan losses $ 480 [1] $ 386 [1]
EnerBank's Loans classified as current Notes receivable 49 70
EnerBank's Loans classified as noncurrent Notes receivable 462 397
EnerBank USA [Member]
   
Total unsecured consumer installment loans, net of an allowance for loan losses 480 386
Allowance for loan losses 5 5
EnerBank's Loans classified as current Notes receivable 19 11
EnerBank's Loans classified as noncurrent Notes receivable $ 461 $ 375
[1] Includes current portion of notes receivable of $19 million at December 31, 2011 and $11 million at December 31, 2010.