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Accumulated Other Comprehensive Income
 3 Months Ended
Mar. 31, 2013
Stockholders' Equity Note [Abstract]  
Comprehensive Income (Loss) Note [Text Block]

18. ACCUMULATED OTHER COMPREHENSIVE INCOME

DUKE ENERGY
                   
The following table presents changes in AOCI by component for Duke Energy. All amounts are net of tax.
                   
(in millions)  Foreign Currency Translation Adjustments Net Gains (Losses) on Cash Flow Hedges Net Gains (Losses) on Available for Sale Securities Pension and OPEB Related AdjustmentsTotal
Balance at December 31, 2011 $ (45) $ (71) $ (9) $ (109) $ (234)
OCI before reclassifications   44   13   1   4   62
Amounts reclassified from AOCI   ―   (1)   (1)   ―   (2)
Total other comprehensive income   44   12   ―   4   60
Balance at March 31, 2012 $ (1) $ (59) $ (9) $ (105) $ (174)
                   
                   
Balance at December 31, 2012 $ (116) $ (100) $ ― $ (90) $ (306)
OCI before reclassifications   4   10   ―   3   17
Total other comprehensive income   4   10   ―   3   17
Balance at March 31, 2013 $ (112) $ (90) $ ― $ (87) $ (289)
                   

For the three months ended March 31, 2013 and March 31, 2012 reclassifications out of AOCI for the Subsidiary Registrants were not material. Changes in AOCI for the Subsidiary Registrants are presented in their respective Condensed Consolidated Statements of Equity.