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Regulatory Matters (Schedule of Net Carrying Value Of Facilities and Megawatt Capacity) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
MW
Dec. 31, 2016
USD ($)
Public Utilities, General Disclosures [Line Items]    
Public Utilities, Property, Plant and Equipment, Net $ 83,516 $ 82,520
Duke Energy Carolinas [Member]    
Public Utilities, General Disclosures [Line Items]    
Public Utilities, Property, Plant and Equipment, Net 26,951 26,762
Progress Energy [Member]    
Public Utilities, General Disclosures [Line Items]    
Public Utilities, Property, Plant and Equipment, Net 30,792 30,181
Duke Energy Florida [Member]    
Public Utilities, General Disclosures [Line Items]    
Public Utilities, Property, Plant and Equipment, Net 12,228 11,790
Duke Energy Indiana [Member]    
Public Utilities, General Disclosures [Line Items]    
Public Utilities, Property, Plant and Equipment, Net $ 9,985 $ 9,924
Generation Facilities To Be Retired [Member]    
Public Utilities, General Disclosures [Line Items]    
Capacity (in MW) | MW 1,738  
Public Utilities, Property, Plant and Equipment, Net $ 419  
Allen Steam Station Units 1-3 [Member] | Generation Facilities To Be Retired [Member] | Duke Energy Carolinas [Member]    
Public Utilities, General Disclosures [Line Items]    
Capacity (in MW) | MW 585  
Public Utilities, Property, Plant and Equipment, Net $ 167  
Crystal River Units 1 and 2 [Member] | Generation Facilities To Be Retired [Member] | Progress Energy [Member]    
Public Utilities, General Disclosures [Line Items]    
Capacity (in MW) | MW 873  
Public Utilities, Property, Plant and Equipment, Net $ 117  
Crystal River Units 1 and 2 [Member] | Generation Facilities To Be Retired [Member] | Duke Energy Florida [Member]    
Public Utilities, General Disclosures [Line Items]    
Capacity (in MW) | MW 873  
Public Utilities, Property, Plant and Equipment, Net $ 117  
Gallagher Units 2 and 4 [Member] | Generation Facilities To Be Retired [Member] | Duke Energy Indiana [Member]    
Public Utilities, General Disclosures [Line Items]    
Capacity (in MW) | MW 280  
Public Utilities, Property, Plant and Equipment, Net $ 135