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Revenue (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 2 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2016
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   $ 23,757      
Revenue from sources other than contracts with customers                   764      
Total operating revenues   $ 6,115 $ 6,628 $ 5,643 $ 6,135 $ 5,799 $ 6,482 $ 5,555 $ 5,729 24,521 $ 23,565 $ 22,743  
Other Revenues [Member]                          
Disaggregation of Revenue [Line Items]                          
Total operating revenues                   1,081 1,239 1,144  
Electric Utilities and Infrastructure [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   21,729      
Total operating revenues                   22,242 21,300 21,336  
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   9,587      
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   6,127      
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   2,974      
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   2,324      
Electric Utilities and Infrastructure [Member] | Other Revenues [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   717      
Total operating revenues                   915 1,050 933  
Gas Utilities and Infrastructure [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1,800      
Total operating revenues                   1,783 1,743 875  
Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Residential [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1,000      
Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Commercial [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   514      
Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Industrial [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   147      
Gas Utilities and Infrastructure [Member] | Other Revenues [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   139      
Total operating revenues                   64 104 30  
Commercial Renewables [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   209      
Total operating revenues                   477 460 484  
Commercial Renewables [Member] | Other Revenues [Member]                          
Disaggregation of Revenue [Line Items]                          
Total operating revenues                   102 85 181  
Other [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   19      
Total operating revenues                   19 62 48  
Duke Energy Carolinas [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   7,108      
Revenue from sources other than contracts with customers                   192      
Total operating revenues   1,775 2,090 1,672 1,763 1,721 2,136 1,729 1,716 7,300 7,302 7,322  
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   7,108      
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   2,981      
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   2,119      
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1,180      
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   508      
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   320      
Progress Energy [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   10,462      
Revenue from sources other than contracts with customers                   266      
Total operating revenues   2,609 3,045 2,498 2,576 2,348 2,864 2,392 2,179 10,728 9,783 9,853  
Progress Energy [Member] | Electric Utilities and Infrastructure [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   10,462      
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   4,785      
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   2,809      
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   904      
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1,462      
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   502      
Duke Energy Progress [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   5,564      
Revenue from sources other than contracts with customers                   135      
Total operating revenues   1,366 1,582 1,291 1,460 1,251 1,460 1,199 1,219 5,699 5,129 5,277  
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   5,564      
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   2,019      
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1,280      
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   642      
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1,303      
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   320      
Duke Energy Florida [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   4,898      
Revenue from sources other than contracts with customers                   123      
Total operating revenues   1,241 1,462 1,203 1,115 1,095 1,401 1,191 959 5,021 4,646 4,568  
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   4,898      
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   2,766      
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1,529      
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   262      
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   159      
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   182      
Duke Energy Ohio [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1,930      
Revenue from sources other than contracts with customers                   27      
Total operating revenues   505 469 459 524 497 471 437 518 1,957 1,923 1,944  
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1,426      
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   743      
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   422      
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   131      
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   57      
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   73      
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   503      
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 customers                   331      
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 customers                   135      
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 customers                   18      
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] | Other Revenues [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   19      
Duke Energy Ohio [Member] | Other [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1      
Duke Energy Indiana [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   3,003      
Revenue from sources other than contracts with customers                   56      
Total operating revenues   771 819 738 731 745 802 742 758 3,059 3,047 $ 2,958  
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   3,003      
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1,076      
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   778      
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   760      
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   298      
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   91      
Piedmont Natural Gas [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1,349      
Revenue from sources other than contracts with customers                   26      
Total operating revenues $ 322 $ 435 $ 172 $ 215 $ 553 $ 444 $ 183 $ 201 $ 500 1,375 $ 1,328   $ 1,149
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   1,349      
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 customers                   669      
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 customers                   378      
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 customers                   128      
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 customers                   54      
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure [Member] | Other Revenues [Member]                          
Disaggregation of Revenue [Line Items]                          
Revenue from contracts with customers                   $ 120