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Investments in Debt and Equity Securities (Available-For-Sale Investments) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, realized loss $ 36 $ 12 $ 47 $ 25  
Debt securities, available-for-sale, realized gain 47 5 57 10  
Equity securities, FV-NI, realized loss 63 31 93 44  
Equity securities, FV-NI, realized gain 66 47 101 66  
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 3,209   3,209   $ 2,458
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 40   40   131
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 8,030   8,030   7,075
Debt securities, available-for-sale 2,577   2,577    
Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 3,153   3,153   2,421
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 39   39   126
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 7,603   7,603   6,706
Debt securities, available-for-sale 2,425   2,425   2,231
Equity Securities, FV-NI, Accumulated Unrealized Gain 3,076   3,076   2,402
Equity Securities, FV-NI, Accumulated Unrealized Loss 36   36   95
Cash and cash equivalents 114   114   88
Equity securities, FV-NI 5,178   5,178   4,475
Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 56   56   37
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 1   1   5
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 427   427   369
Debt securities, available-for-sale 315   315   270
Equity Securities, FV-NI, Accumulated Unrealized Gain 49   49   36
Equity Securities, FV-NI, Accumulated Unrealized Loss         1
Cash and cash equivalents 49   49   22
Equity securities, FV-NI 112   112   99
Duke Energy Carolinas [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, realized loss 11 8 21 18  
Debt securities, available-for-sale, realized gain 16 4 25 9  
Equity securities, FV-NI, realized loss 48 17 69 22  
Equity securities, FV-NI, realized gain 44 26 67 36  
Debt securities, available-for-sale 1,120   1,120    
Duke Energy Carolinas [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 1,711   1,711   1,316
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 12   12   74
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 4,044   4,044   3,553
Debt securities, available-for-sale 1,161   1,161   1,069
Equity Securities, FV-NI, Accumulated Unrealized Gain 1,671   1,671   1,309
Equity Securities, FV-NI, Accumulated Unrealized Loss 9   9   54
Cash and cash equivalents 41   41   29
Equity securities, FV-NI 2,883   2,883   2,484
Progress Energy [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, realized loss 25 4 26 7  
Debt securities, available-for-sale, realized gain 30 1 31 1  
Equity securities, FV-NI, realized loss 15 14 24 22  
Equity securities, FV-NI, realized gain 22 21 34 30  
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 1,445   1,445   1,105
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 27   27   52
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 3,656   3,656   3,217
Debt securities, available-for-sale 1,241   1,241    
Progress Energy [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 1,442   1,442   1,105
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 27   27   52
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 3,559   3,559   3,153
Debt securities, available-for-sale 1,264   1,264   1,162
Equity Securities, FV-NI, Accumulated Unrealized Gain 1,405   1,405   1,093
Equity Securities, FV-NI, Accumulated Unrealized Loss 27   27   41
Cash and cash equivalents 73   73   59
Equity securities, FV-NI 2,295   2,295   1,991
Progress Energy [Member] | Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 3   3    
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 97   97   64
Debt securities, available-for-sale 97   97   64
Cash and cash equivalents 47   47   17
Duke Energy Progress [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, realized loss 1 3 2 5  
Debt securities, available-for-sale, realized gain 1 1 2 1  
Equity securities, FV-NI, realized loss 7 12 15 20  
Equity securities, FV-NI, realized gain 7 17 17 25  
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 1,128   1,128   842
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 24   24   39
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 2,836   2,836   2,500
Debt securities, available-for-sale 906   906    
Duke Energy Progress [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 1,128   1,128   842
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 24   24   39
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 2,834   2,834   2,494
Debt securities, available-for-sale 948   948   906
Equity Securities, FV-NI, Accumulated Unrealized Gain 1,092   1,092   833
Equity Securities, FV-NI, Accumulated Unrealized Loss 24   24   30
Cash and cash equivalents 42   42   46
Equity securities, FV-NI 1,886   1,886   1,588
Duke Energy Progress [Member] | Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 2   2   6
Debt securities, available-for-sale 2   2   6
Cash and cash equivalents 2   2   6
Duke Energy Florida [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, realized loss 24 1 24 2  
Debt securities, available-for-sale, realized gain 29   29    
Equity securities, FV-NI, realized loss 8 2 9 2  
Equity securities, FV-NI, realized gain 15 $ 4 17 $ 5  
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 317   317   263
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 3   3   13
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 777   777   707
Debt securities, available-for-sale 335   335    
Duke Energy Florida [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 314   314   263
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 3   3   13
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 725   725   659
Debt securities, available-for-sale 316   316   256
Equity Securities, FV-NI, Accumulated Unrealized Gain 313   313   260
Equity Securities, FV-NI, Accumulated Unrealized Loss 3   3   11
Cash and cash equivalents 31   31   13
Equity securities, FV-NI 409   409   403
Duke Energy Florida [Member] | Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 3   3    
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 52   52   48
Debt securities, available-for-sale 52   52   48
Cash and cash equivalents 2   2   1
Duke Energy Indiana [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 37   37   29
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 1   1   1
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 116   116   108
Debt securities, available-for-sale 42   42    
Equity Securities, FV-NI, Accumulated Unrealized Gain 37   37   29
Equity securities, FV-NI 74   74   67
Duke Energy Indiana [Member] | Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Equity securities, FV-NI 74   74   67
Corporate debt securities [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 30   30   4
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 1   1   13
Debt securities, available-for-sale 571   571   566
Corporate debt securities [Member] | Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 2   2    
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         2
Debt securities, available-for-sale 60   60   60
Corporate debt securities [Member] | Duke Energy Carolinas [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 18   18   2
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 1   1   9
Debt securities, available-for-sale 360   360   341
Corporate debt securities [Member] | Progress Energy [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 12   12   2
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         4
Debt securities, available-for-sale 211   211   225
Corporate debt securities [Member] | Duke Energy Progress [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 12   12   2
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         3
Debt securities, available-for-sale 211   211   171
Corporate debt securities [Member] | Duke Energy Florida [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         1
Debt securities, available-for-sale         54
Corporate debt securities [Member] | Duke Energy Indiana [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale 7   7   8
Municipal bonds [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 10   10   1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         4
Debt securities, available-for-sale 318   318   353
Municipal bonds [Member] | Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 3   3   0
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 1   1   1
Debt securities, available-for-sale 90   90   85
Municipal bonds [Member] | Duke Energy Carolinas [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 2   2    
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         1
Debt securities, available-for-sale 63   63   81
Municipal bonds [Member] | Progress Energy [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 8   8   1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         3
Debt securities, available-for-sale 255   255   272
Municipal bonds [Member] | Progress Energy [Member] | Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 3   3    
Debt securities, available-for-sale 50   50   47
Municipal bonds [Member] | Duke Energy Progress [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 8   8   1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         3
Debt securities, available-for-sale 255   255   271
Municipal bonds [Member] | Duke Energy Florida [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale         1
Municipal bonds [Member] | Duke Energy Florida [Member] | Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 3   3    
Debt securities, available-for-sale 50   50   47
Municipal bonds [Member] | Duke Energy Indiana [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 1   1   1
Debt securities, available-for-sale 34   34   33
US treasury and government [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 34   34   14
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 1   1   12
Debt securities, available-for-sale 1,270   1,270   1,076
US treasury and government [Member] | Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 2   2   1
Debt securities, available-for-sale 51   51   45
US treasury and government [Member] | Duke Energy Carolinas [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 17   17   5
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 1   1   8
Debt securities, available-for-sale 556   556   475
US treasury and government [Member] | Progress Energy [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 17   17   9
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         4
Debt securities, available-for-sale 714   714   601
US treasury and government [Member] | Duke Energy Progress [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 16   16   6
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         3
Debt securities, available-for-sale 429   429   415
US treasury and government [Member] | Duke Energy Florida [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 1   1   3
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         1
Debt securities, available-for-sale 285   285   186
US treasury and government [Member] | Duke Energy Indiana [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale 1   1    
Other debt obligations [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 3   3    
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 1   1   2
Debt securities, available-for-sale 152   152   148
Other debt obligations [Member] | Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         1
Debt securities, available-for-sale 65   65   58
Other debt obligations [Member] | Duke Energy Carolinas [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 3   3    
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 1   1   2
Debt securities, available-for-sale 141   141   143
Other debt obligations [Member] | Progress Energy [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale 11   11   5
Other debt obligations [Member] | Duke Energy Progress [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale $ 11   $ 11   3
Other debt obligations [Member] | Duke Energy Florida [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale         $ 2