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Investments in Debt and Equity Securities (Available-For-Sale Investments) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, realized loss $ 36 $ 7 $ 83 $ 32  
Debt securities, available-for-sale, realized gain 53 4 110 14  
Equity securities, FV-NI, realized loss 43 16 136 60  
Equity securities, FV-NI, realized gain 60 19 161 85  
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 3,274   3,274   $ 2,458
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 64   64   131
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 8,134   8,134   7,075
Debt securities, available-for-sale 2,633   2,633    
Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 3,215   3,215   2,421
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 64   64   126
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 7,698   7,698   6,706
Debt securities, available-for-sale 2,476   2,476   2,231
Equity Securities, FV-NI, Accumulated Unrealized Gain 3,118   3,118   2,402
Equity Securities, FV-NI, Accumulated Unrealized Loss 63   63   95
Cash and cash equivalents 114   114   88
Equity securities, FV-NI 5,222   5,222   4,475
Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 59   59   37
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss         5
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 436   436   369
Debt securities, available-for-sale 324   324   270
Equity Securities, FV-NI, Accumulated Unrealized Gain 48   48   36
Equity Securities, FV-NI, Accumulated Unrealized Loss         1
Cash and cash equivalents 53   53   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 13 6 34 24  
Debt securities, available-for-sale, realized gain 21 4 46 13  
Equity securities, FV-NI, realized loss 26 8 95 30  
Equity securities, FV-NI, realized gain 34 11 101 47  
Debt securities, available-for-sale 1,159   1,159    
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 1,731   1,731   1,316
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 16   16   74
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 4,096   4,096   3,553
Debt securities, available-for-sale 1,195   1,195   1,069
Equity Securities, FV-NI, Accumulated Unrealized Gain 1,680   1,680   1,309
Equity Securities, FV-NI, Accumulated Unrealized Loss 15   15   54
Cash and cash equivalents 36   36   29
Equity securities, FV-NI 2,901   2,901   2,484
Progress Energy [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, realized loss 23 1 49 8  
Debt securities, available-for-sale, realized gain 31   62 1  
Equity securities, FV-NI, realized loss 17 8 41 30  
Equity securities, FV-NI, realized gain 26 8 60 38  
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 1,488   1,488   1,105
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 48   48   52
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 3,703   3,703   3,217
Debt securities, available-for-sale 1,255   1,255    
Progress Energy [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 1,484   1,484   1,105
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 48   48   52
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 3,602   3,602   3,153
Debt securities, available-for-sale 1,281   1,281   1,162
Equity Securities, FV-NI, Accumulated Unrealized Gain 1,438   1,438   1,093
Equity Securities, FV-NI, Accumulated Unrealized Loss 48   48   41
Cash and cash equivalents 78   78   59
Equity securities, FV-NI 2,321   2,321   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 4   4    
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 101   101   64
Debt securities, available-for-sale 101   101   64
Cash and cash equivalents 49   49   17
Duke Energy Progress [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, realized loss   1 2 6  
Debt securities, available-for-sale, realized gain 2   4 1  
Equity securities, FV-NI, realized loss 9 7 24 27  
Equity securities, FV-NI, realized gain 10 7 27 32  
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 1,152   1,152   842
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 30   30   39
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 2,884   2,884   2,500
Debt securities, available-for-sale 923   923    
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 1,152   1,152   842
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 30   30   39
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 2,882   2,882   2,494
Debt securities, available-for-sale 975   975   906
Equity Securities, FV-NI, Accumulated Unrealized Gain 1,107   1,107   833
Equity Securities, FV-NI, Accumulated Unrealized Loss 30   30   30
Cash and cash equivalents 52   52   46
Equity securities, FV-NI 1,907   1,907   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 23   47 2  
Debt securities, available-for-sale, realized gain 29   58    
Equity securities, FV-NI, realized loss 8 1 17 3  
Equity securities, FV-NI, realized gain 16 $ 1 33 $ 6  
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 336   336   263
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 18   18   13
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 776   776   707
Debt securities, available-for-sale 332   332    
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 332   332   263
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss 18   18   13
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 720   720   659
Debt securities, available-for-sale 306   306   256
Equity Securities, FV-NI, Accumulated Unrealized Gain 331   331   260
Equity Securities, FV-NI, Accumulated Unrealized Loss 18   18   11
Cash and cash equivalents 26   26   13
Equity securities, FV-NI 414   414   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 4   4    
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 56   56   48
Debt securities, available-for-sale 56   56   48
Cash and cash equivalents 4   4   1
Duke Energy Indiana [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain 38   38   29
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss         1
Debt Securities, Available-for-sale, and Equity Securities, FV-NI 117   117   108
Debt securities, available-for-sale 43   43    
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 40   40   4
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 1   1   13
Debt securities, available-for-sale 633   633   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 72   72   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 24   24   2
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 1   1   9
Debt securities, available-for-sale 409   409   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 16   16   2
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         4
Debt securities, available-for-sale 224   224   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 16   16   2
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         3
Debt securities, available-for-sale 224   224   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 6   6   8
Municipal bonds [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 14   14   1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         4
Debt securities, available-for-sale 370   370   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 5   5    
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         1
Debt securities, available-for-sale 94   94   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 4   4    
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         1
Debt securities, available-for-sale 96   96   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 10   10   1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         3
Debt securities, available-for-sale 274   274   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 4   4    
Debt securities, available-for-sale 52   52   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 10   10   1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         3
Debt securities, available-for-sale 274   274   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 4   4    
Debt securities, available-for-sale 52   52   47
Municipal bonds [Member] | Duke Energy Indiana [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 1   1    
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         1
Debt securities, available-for-sale 36   36   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 39   39   14
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         12
Debt securities, available-for-sale 1,217   1,217   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 3   3   1
Debt securities, available-for-sale 40   40   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 19   19   5
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         8
Debt securities, available-for-sale 517   517   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 20   20   9
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         4
Debt securities, available-for-sale 700   700   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 19   19   6
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         3
Debt securities, available-for-sale 420   420   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 280   280   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 4   4    
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         2
Debt securities, available-for-sale 142   142   148
Other debt obligations [Member] | Other Classification [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 1   1    
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 4   4    
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax         2
Debt securities, available-for-sale 137   137   143
Other debt obligations [Member] | Progress Energy [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale 5   5   5
Other debt obligations [Member] | Duke Energy Progress [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale $ 5   $ 5   3
Other debt obligations [Member] | Duke Energy Florida [Member] | Ndtf [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, available-for-sale         $ 2