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Acquisitions and Dispositions (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Jun. 30, 2015
Significant Acquisitions and Disposals [Abstract]      
Payments to acquire businesses   $ 29  
Piedmont Natural Gas [Member]      
Significant Acquisitions and Disposals [Abstract]      
Payments to acquire businesses $ 4,900    
Long-term debt assumed 2,000    
Forward starting interest rate swaps, notional $ 1,400    
Shares offered 10.6    
Bridge Facility $ 4,900    
Bridge Facility, Remaining Borrowing Capacity 4,200    
Acquirer Termination Fee 250    
Acquiree Termination Fee 125    
Duke Energy Progress [Member] | NCEMPA Generating Assets [Member]      
Significant Acquisitions and Disposals [Abstract]      
Payments to acquire businesses 1,250    
Acquisition adjustment, recorded within property, plant and equipment 350    
Duke Energy Ohio [Member] | Midwest Generation Business [Member]      
Significant Acquisitions and Disposals [Abstract]      
Proceeds from sale of business     $ 2,800
International Energy [Member]      
Significant Acquisitions and Disposals [Abstract]      
Segment Carrying Value 2,600    
Currency Translation Adjustment $ 644