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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 5,998 | $ 5,928
Revenue from sources other than contracts with customers | 165 | 207
Total operating revenues | 6,163 | 6,135
Electric Utilities and Infrastructure [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 5,221 | 5,161
Total operating revenues | 5,321 | 5,315
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,370 | 2,350
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,427 | 1,375
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 711 | 664
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 541 | 633
Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 172 | 139
Gas Utilities and Infrastructure [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 731 | 717
Total operating revenues | 732 | 702
Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Residential [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 414 | 413
Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Commercial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 206 | 201
Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Industrial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 48 | 48
Gas Utilities and Infrastructure [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 63 | 55
Commercial Renewables [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 42 | 33
Total operating revenues | 106 | 101
Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 4 | 17
Total operating revenues | 4 | 17
Duke Energy Carolinas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,719 | 1,694
Revenue from sources other than contracts with customers | 25 | 69
Total operating revenues | 1,744 | 1,763
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,719 | 1,694
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 | 760 | 781
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 | 496 | 472
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 | 266 | 255
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 | 119 | 119
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 78 | 67
Progress Energy [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,493 | 2,526
Revenue from sources other than contracts with customers | 79 | 50
Total operating revenues | 2,572 | 2,576
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,493 | 2,526
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,114 | 1,112
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 632 | 631
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 222 | 208
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 353 | 446
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 172 | 129
Duke Energy Progress [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,443 | 1,442
Revenue from sources other than contracts with customers | 41 | 18
Total operating revenues | 1,484 | 1,460
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,443 | 1,442
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 | 536 | 516
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 | 306 | 299
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 | 161 | 145
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 | 315 | 397
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 125 | 85
Duke Energy Florida [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,050 | 1,083
Revenue from sources other than contracts with customers | 36 | 32
Total operating revenues | 1,086 | 1,115
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,050 | 1,083
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 | 578 | 595
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 | 326 | 333
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 | 61 | 62
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 | 38 | 50
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 47 | 43
Duke Energy Ohio [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 531 | 507
Revenue from sources other than contracts with customers |  | 17
Total operating revenues | 531 | 524
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 355 | 320
Total operating revenues | 355 | 336
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 | 189 | 180
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 | 103 | 96
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 | 33 | 30
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 | 14 |
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 16 | 14
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 176 | 173
Total operating revenues | 176 | 174
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 | 112 | 111
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 | 49 | 49
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 | 7 | 7
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 8 | 6
Duke Energy Ohio [Member] | Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers |  | 14
Duke Energy Indiana [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 764 | 714
Revenue from sources other than contracts with customers | 4 | 17
Total operating revenues | 768 | 731
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 764 | 714
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 | 306 | 278
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 | 197 | 178
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 | 190 | 173
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 | 54 | 68
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 17 | 17
Piedmont Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 570 | 557
Revenue from sources other than contracts with customers | 9 | (4)
Total operating revenues | 579 | 553
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 570 | 557
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 | 302 | 302
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 | 157 | 152
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 | 42 | 41
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 | 13 | 13
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 56 | $ 49

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