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Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | $ 6,628 | $ 6,482 | $ 18,406 | $ 17,766 |
Segment income (loss) | 1,078 | 956 | 2,203 | 2,360 |
Add back noncontrolling interests | (16) | 1 | (12) | 5 |
Income (Loss) From Discontinued Operations, net of tax | 4 | (2) | (1) | (4) |
Net Income | 1,066 | 955 | 2,190 | 2,361 |
Net income (attributable to parent) | 1,082 | 954 | 2,202 | 2,356 |
Segment assets | 143,165 |  | 143,165 |  | $ 137,914
Electric Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 6,253 | 6,122 | 16,783 | 16,211 |
Gas Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 232 | 249 | 1,229 | 1,175 |
Commercial Renewables [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 127 | 95 | 347 | 333 |
Total Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 6,612 | 6,466 | 18,359 | 17,719 |
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 16 | 16 | 47 | 47 |
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment income (loss) | 1,122 | 990 | 2,649 | 2,565 |
Segment assets | 139,865 |  | 139,865 |  |
Operating Segments [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 6,260 | 6,129 | 16,806 | 16,234 |
Segment income (loss) | 1,167 | 1,020 | 2,492 | 2,384 |
Segment assets | 123,847 |  | 123,847 |  |
Operating Segments [Member] | Gas Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 256 | 272 | 1,301 | 1,243 |
Segment income (loss) | 17 | 19 | 161 | 179 |
Segment assets | 11,806 |  | 11,806 |  |
Operating Segments [Member] | Commercial Renewables [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 127 | 95 | 347 | 333 |
Segment income (loss) | (62) | (49) | (4) | 2 |
Segment assets | 4,212 |  | 4,212 |  |
Operating Segments [Member] | Total Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 6,643 | 6,496 | 18,454 | 17,810 |
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | (49) | (49) | (149) | (147) |
Segment assets | 185 |  | 185 |  |
Intersegment Eliminations [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 7 | 7 | 23 | 23 |
Intersegment Eliminations [Member] | Gas Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 24 | 23 | 72 | 68 |
Intersegment Eliminations [Member] | Total Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 31 | 30 | 95 | 91 |
Intersegment Eliminations [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 18 | 19 | 54 | 56 |
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment income (loss) | (44) | (34) | (446) | (205) |
Segment assets | 3,115 |  | 3,115 |  |
Corporate, Non-Segment [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 34 | 35 | 101 | 103 |
Duke Energy Ohio [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 469 | 471 | 1,452 | 1,426 |
Segment income (loss) | 100 | 56 | 121 | 128 |
Income (Loss) From Discontinued Operations, net of tax |  | (1) |  | (1) |
Net Income |  |  |  | 127 |
Net income (attributable to parent) | 100 | 55 | 121 | 127 |
Segment assets | 8,296 |  | 8,296 |  | $ 7,875
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 373 | 371 | 1,055 | 1,036 |
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 84 | 90 | 361 | 360 |
Duke Energy Ohio [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 457 | 461 | 1,416 | 1,396 |
Segment income (loss) | 97 | 64 | 221 | 152 |
Segment assets | 8,259 |  | 8,259 |  |
Duke Energy Ohio [Member] | Operating Segments [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment income (loss) | 85 | 50 | 157 | 96 |
Segment assets | 5,484 |  | 5,484 |  |
Duke Energy Ohio [Member] | Operating Segments [Member] | Gas Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment income (loss) | 12 | 14 | 64 | 56 |
Segment assets | 2,775 |  | 2,775 |  |
Duke Energy Ohio [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment assets | (2) |  | (2) |  |
Duke Energy Ohio [Member] | Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 12 | 10 | 36 | 30 |
Segment income (loss) | 3 | $ (8) | (100) | $ (24) |
Segment assets | $ 39 |  | $ 39 |  |

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