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Revenue (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 $ 24,348 $ 23,757  
Revenue from sources other than contracts with customers                 731 764  
Total operating revenues $ 6,103 $ 6,940 $ 5,873 $ 6,163 $ 6,115 $ 6,628 $ 5,643 $ 6,135 25,079 24,521 $ 23,565
Other                      
Disaggregation of Revenue [Line Items]                      
Total operating revenues                 1,037 1,081 1,239
Electric Utilities and Infrastructure                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 22,347 21,729  
Total operating revenues                 22,798 22,242 21,300
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 9,863 9,587  
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 6,431 6,127  
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 3,071 2,974  
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 2,212 2,324  
Electric Utilities and Infrastructure | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 770 717  
Total operating revenues                 855 915 1,050
Gas Utilities and Infrastructure                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 1,754 1,800  
Total operating revenues                 1,770 1,783 1,743
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 976 1,000  
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 508 514  
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 141 147  
Gas Utilities and Infrastructure | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 129 139  
Total operating revenues                 84 64 104
Commercial Renewables                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 223 209  
Total operating revenues                 487 477 460
Commercial Renewables | Other                      
Disaggregation of Revenue [Line Items]                      
Total operating revenues                 98 102 85
Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 24 19  
Total operating revenues                 24 19 62
Duke Energy Carolinas                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 7,241 7,108  
Revenue from sources other than contracts with customers                 154 192  
Total operating revenues 1,776 2,162 1,713 1,744 1,775 2,090 1,672 1,763 7,395 7,300 7,302
Duke Energy Carolinas | Electric Utilities and Infrastructure                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 7,241 7,108  
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 3,044 2,981  
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 2,244 2,119  
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 1,215 1,180  
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 462 508  
Duke Energy Carolinas | Electric Utilities and Infrastructure | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 276 320  
Progress Energy                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 10,883 10,462  
Revenue from sources other than contracts with customers                 319 266  
Total operating revenues 2,644 3,242 2,744 2,572 2,609 3,045 2,498 2,576 11,202 10,728 9,783
Progress Energy | Electric Utilities and Infrastructure                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 10,883 10,462  
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 4,998 4,785  
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 2,935 2,809  
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 934 904  
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 1,468 1,462  
Progress Energy | Electric Utilities and Infrastructure | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 548 502  
Duke Energy Progress                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 5,785 5,564  
Revenue from sources other than contracts with customers                 172 135  
Total operating revenues 1,398 1,688 1,387 1,484 1,366 1,582 1,291 1,460 5,957 5,699 5,129
Duke Energy Progress | Electric Utilities and Infrastructure                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 5,785 5,564  
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 2,144 2,019  
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 1,368 1,280  
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 675 642  
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 1,281 1,303  
Duke Energy Progress | Electric Utilities and Infrastructure | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 317 320  
Duke Energy Florida                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 5,098 4,898  
Revenue from sources other than contracts with customers                 133 123  
Total operating revenues 1,244 1,548 1,353 1,086 1,241 1,462 1,203 1,115 5,231 5,021 4,646
Duke Energy Florida | Electric Utilities and Infrastructure                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 5,098 4,898  
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 2,854 2,766  
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 1,567 1,529  
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 259 262  
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 187 159  
Duke Energy Florida | Electric Utilities and Infrastructure | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 231 182  
Duke Energy Ohio                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 1,940 1,930  
Revenue from sources other than contracts with customers                   27  
Total operating revenues 487 489 433 531 505 469 459 524 1,940 1,957 1,923
Duke Energy Ohio | Electric Utilities and Infrastructure                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 1,457 1,426  
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 733 743  
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 451 422  
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 147 131  
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 46 57  
Duke Energy Ohio | Electric Utilities and Infrastructure | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 80 73  
Duke Energy Ohio | Gas Utilities and Infrastructure                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 483 503  
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 315 331  
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 130 135  
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 19 18  
Duke Energy Ohio | Gas Utilities and Infrastructure | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 19 19  
Duke Energy Ohio | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                   1  
Duke Energy Indiana                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 2,987 3,003  
Revenue from sources other than contracts with customers                 17 56  
Total operating revenues 715 807 714 768 771 819 738 731 3,004 3,059 3,047
Duke Energy Indiana | Electric Utilities and Infrastructure                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 2,987 3,003  
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 1,087 1,076  
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 802 778  
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 774 760  
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 235 298  
Duke Energy Indiana | Electric Utilities and Infrastructure | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 89 91  
Piedmont                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 1,322 1,349  
Revenue from sources other than contracts with customers                 59 26  
Total operating revenues $ 425 $ 168 $ 209 $ 579 $ 435 $ 172 $ 215 $ 553 1,381 1,375 $ 1,328
Piedmont | Gas Utilities and Infrastructure                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 1,322 1,349  
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 661 669  
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 378 378  
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 122 128  
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 51 54  
Piedmont | Gas Utilities and Infrastructure | Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 $ 110 $ 120