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Acquisitions and Sales of Other Assets (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2013
Jul. 02, 2012
Jun. 30, 2013
Purchase Price Allocation Adjustments [Member]
Jan. 12, 2012
Wabash Valley Power Association [Member]
Jun. 30, 2013
Ibener [Member]
Apr. 30, 2013
Ibener [Member]
Jan. 12, 2012
Duke Energy Ohio [Member]
Jun. 30, 2013
Duke Energy Ohio [Member]
Jun. 30, 2012
Duke Energy Ohio [Member]
Jan. 12, 2012
Duke Energy Indiana [Member]
Jun. 30, 2013
Duke Energy Indiana [Member]
Jun. 30, 2012
Duke Energy Indiana [Member]
Significant Acquisitions and Disposals [Line Items]                            
Adjusted conversion ratio, after reverse stock split adjustment       87.083%                    
Fair value of outstanding earned stock compensation awards       $ 62                    
Total estimated purchase price       18,071                    
Costs to achieve the merger 19 29                        
Transfer of Vermillion Generating Station                   0 28   0 26
Proceeds from sale of interest in jointly owned utility plant           14     82     68    
Sale of ownership interest in Vermillion Generating Station                 75.00%          
Equity ownership interest rate           37.50%           62.50%    
Cash collateral returned               192            
Cash paid             415              
Property, plant and equipment     23,141   (138)   383              
Intangibles             30              
Deferred tax             57              
Working capital             6              
Bridge loan             190              
Goodwill     $ 12,469   $ 2   $ 54