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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Receivables, allowance for doubtful accounts $ 35 $ 34
Restricted receivables, allowance for doubtful accounts 40 34
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 2,000,000,000 2,000,000,000
Common stock, shares outstanding 1,336,000,000 1,329,000,000
Duke Energy Carolinas [Member]
   
Receivables, allowance for doubtful accounts 3 3
Restricted receivables, allowance for doubtful accounts 6 6
Duke Energy Ohio [Member]
   
Receivables, allowance for doubtful accounts 16 18
Common stock, par value $ 8.5 $ 8.5
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares outstanding 89,663,086 89,663,086
Duke Energy Indiana [Member]
   
Receivables, allowance for doubtful accounts $ 1 $ 1
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 60,000,000 60,000,000
Common stock, shares outstanding 53,913,701 53,913,701