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Fair Value Measurements (Additional Fair Value Disclosure) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 40,307 $ 39,569
Long-term debt, fair value 44,785 42,537
Duke Energy Carolinas [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 9,360 8,367
Long-term debt, fair value 10,567 9,156
Progress Energy [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 14,210 14,464
Long-term debt, fair value 16,245 15,856
Duke Energy Progress [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 6,565 6,518
Long-term debt, fair value 7,134 6,757
Duke Energy Florida [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 4,265 4,266
Long-term debt, fair value 5,109 4,908
Duke Energy Ohio [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 1,642 1,598
Long-term debt, fair value 1,836 1,724
Duke Energy Indiana [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 3,768 3,768
Long-term debt, fair value $ 4,362 $ 4,219