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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 5,695 | $ 5,467 | $ 11,693 | $ 11,394
Revenue from sources other than contracts with customers | 178 | 176 | 343 | 384
Total operating revenues | 5,873 | 5,643 | 12,036 | 11,778
Electric Utilities and Infrastructure [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 5,361 | 5,111 | 10,582 | 10,272
Total operating revenues | 5,467 | 5,215 | 10,788 | 10,530
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Residential [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,304 | 2,185 | 4,674 | 4,535
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | General [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,584 | 1,481 | 3,011 | 2,856
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Industrial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 759 | 736 | 1,470 | 1,400
Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 527 | 515 | 1,068 | 1,148
Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 187 | 194 | 359 | 333
Gas Utilities and Infrastructure [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 282 | 294 | 1,013 | 1,011
Total operating revenues | 282 | 294 | 1,014 | 997
Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Residential [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 146 | 153 | 560 | 566
Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Commercial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 85 | 87 | 291 | 288
Gas Utilities and Infrastructure [Member] | Natural Gas, US Regulated [Member] | Industrial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 29 | 31 | 77 | 79
Gas Utilities and Infrastructure [Member] | Other Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 22 | 23 | 85 | 78
Commercial Renewables [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 46 | 47 | 88 | 80
Total operating revenues | 118 | 119 | 224 | 220
Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 6 | 15 | 10 | 31
Total operating revenues | 6 | 15 | 10 | 31
Duke Energy Carolinas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,676 | 1,646 | 3,395 | 3,340
Revenue from sources other than contracts with customers | 37 | 26 | 62 | 95
Total operating revenues | 1,713 | 1,672 | 3,457 | 3,435
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,676 | 1,646 | 3,395 | 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 customers | 679 | 659 | 1,439 | 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 customers | 531 | 501 | 1,027 | 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 customers | 289 | 286 | 555 | 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 customers | 109 | 115 | 228 | 234
Duke Energy Carolinas [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 68 | 85 | 146 | 152
Progress Energy [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,674 | 2,419 | 5,167 | 4,945
Revenue from sources other than contracts with customers | 70 | 79 | 149 | 129
Total operating revenues | 2,744 | 2,498 | 5,316 | 5,074
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,674 | 2,419 | 5,167 | 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 customers | 1,243 | 1,099 | 2,357 | 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 customers | 750 | 678 | 1,382 | 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 customers | 231 | 224 | 453 | 432
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Electricity, US Regulated [Member] | Wholesale [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 351 | 322 | 704 | 768
Progress Energy [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 99 | 96 | 271 | 225
Duke Energy Progress [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,352 | 1,245 | 2,795 | 2,687
Revenue from sources other than contracts with customers | 35 | 46 | 76 | 64
Total operating revenues | 1,387 | 1,291 | 2,871 | 2,751
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,352 | 1,245 | 2,795 | 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 customers | 496 | 452 | 1,032 | 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 customers | 339 | 300 | 645 | 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 customers | 164 | 159 | 325 | 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 customers | 309 | 287 | 624 | 684
Duke Energy Progress [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 44 | 47 | 169 | 132
Duke Energy Florida [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,322 | 1,175 | 2,372 | 2,258
Revenue from sources other than contracts with customers | 31 | 28 | 67 | 60
Total operating revenues | 1,353 | 1,203 | 2,439 | 2,318
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,322 | 1,175 | 2,372 | 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 customers | 747 | 648 | 1,325 | 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 customers | 411 | 377 | 737 | 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 customers | 67 | 66 | 128 | 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 customers | 42 | 34 | 80 | 84
Duke Energy Florida [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 55 | 50 | 102 | 93
Duke Energy Ohio [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 429 | 462 | 960 | 969
Revenue from sources other than contracts with customers | 4 | (3) | 4 | 14
Total operating revenues | 433 | 459 | 964 | 983
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 334 | 349 | 689 | 669
Total operating revenues | 336 | 346 | 691 | 682
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 | 159 | 181 | 348 | 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 customers | 105 | 110 | 208 | 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 customers | 36 | 33 | 69 | 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 customers | 9 | 2 | 23 | 2
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 25 | 23 | 41 | 37
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 95 | 103 | 271 | 276
Total operating revenues | 97 | 103 | 273 | 277
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 | 64 | 66 | 176 | 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 customers | 26 | 28 | 75 | 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 customers | 3 | 3 | 10 | 10
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] | Other Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2 | 6 | 10 | 12
Duke Energy Ohio [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 10 |  | 24
Duke Energy Indiana [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 709 | 722 | 1,473 | 1,436
Revenue from sources other than contracts with customers | 5 | 16 | 9 | 33
Total operating revenues | 714 | 738 | 1,482 | 1,469
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 709 | 722 | 1,473 | 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 customers | 225 | 245 | 531 | 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 customers | 197 | 188 | 394 | 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 customers | 201 | 192 | 391 | 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 customers | 59 | 77 | 113 | 145
Duke Energy Indiana [Member] | Electric Utilities and Infrastructure [Member] | Other Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 27 | 20 | 44 | 37
Piedmont Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 197 | 205 | 767 | 762
Revenue from sources other than contracts with customers | 12 | 10 | 21 | 6
Total operating revenues | 209 | 215 | 788 | 768
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 197 | 205 | 767 | 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 customers | 82 | 87 | 384 | 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 customers | 59 | 59 | 216 | 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 customers | 24 | 28 | 66 | 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 customers | 13 | 14 | 26 | 27
Piedmont Natural Gas [Member] | Gas Utilities and Infrastructure [Member] | Other Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 19 | $ 17 | $ 75 | $ 66

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