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Revenue (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer $ 5,467   $ 11,394  
Revenue from Sources other than Contracts with Customers 176   384  
Operating revenues 5,643 $ 5,555 11,778 $ 11,284
Electric Utilities and Infrastructure [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 5,111   10,272  
Operating revenues 5,215 5,150 10,530 10,090
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 2,185   4,535  
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 1,481   2,856  
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 736   1,400  
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 515   1,148  
Electric Utilities and Infrastructure [Member] | Other Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 194   333  
Gas Utilities and Infrastructure [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 294   1,011  
Operating revenues 294 279 997 927
Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 153   566  
Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 87   288  
Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 31   79  
Gas Utilities and Infrastructure [Member] | Other Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 23   78  
Commercial Renewables [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 47   80  
Operating revenues 119 110 220 238
Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 15   31  
Operating revenues 15 16 31 29
Duke Energy Carolinas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 1,646   3,340  
Revenue from Sources other than Contracts with Customers 26   95  
Operating revenues 1,672 1,729 3,435 3,445
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 1,646   3,340  
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 659   1,440  
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 501   973  
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 286   541  
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 115   234  
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 85   152  
Progress Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 2,419   4,945  
Revenue from Sources other than Contracts with Customers 79   129  
Operating revenues 2,498 2,392 5,074 4,571
Progress Energy [Member] | Electric Utilities and Infrastructure [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 2,419   4,945  
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 1,099   2,211  
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 678   1,309  
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 224   432  
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 322   768  
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 96   225  
Duke Energy Progress [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 1,245   2,687  
Revenue from Sources other than Contracts with Customers 46   64  
Operating revenues 1,291 1,199 2,751 2,418
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 1,245   2,687  
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 452   968  
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 300   599  
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 159   304  
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 287   684  
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 47   132  
Duke Energy Florida [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 1,175   2,258  
Revenue from Sources other than Contracts with Customers 28   60  
Operating revenues 1,203 1,191 2,318 2,150
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 1,175   2,258  
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 648   1,243  
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 377   710  
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 66   128  
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 34   84  
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 50   93  
Duke Energy Ohio [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 462   969  
Revenue from Sources other than Contracts with Customers (3)   14  
Operating revenues 459 437 983 955
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 349   669  
Operating revenues 346 329 682 665
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 181   361  
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 110   206  
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 33   63  
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 2   2  
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 23   37  
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 103   276  
Operating revenues 103 100 277 270
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 66   177  
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 28   77  
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 3   10  
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] | Other Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 6   12  
Duke Energy Ohio [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 10   24  
Duke Energy Indiana [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 722   1,436  
Revenue from Sources other than Contracts with Customers 16   33  
Operating revenues 738 742 1,469 1,500
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 722   1,436  
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 245   523  
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 188   366  
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 192   365  
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 77   145  
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 20   37  
Piedmont Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 205   762  
Revenue from Sources other than Contracts with Customers 10   6  
Operating revenues 215 $ 201 768 $ 701
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 205   762  
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 87   389  
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 59   211  
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 28   69  
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Power Generation [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 14   27  
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure [Member] | Other Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer $ 17   $ 66