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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 |

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