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Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | $ 5,643 | $ 5,555 | $ 11,778 | $ 11,284 |
Segment income (loss) | 505 | 688 | 1,125 | 1,404 |
Net Income (Loss) Attributable to Noncontrolling Interest | 2 | 3 | 4 | 4 |
Loss From Discontinued Operations, net of tax | (5) | (2) | (5) | (2) |
Net income | 502 | 689 | 1,124 | 1,406 |
Segment assets | 140,259 |  | 140,259 |  | $ 137,914
Electric Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 5,215 | 5,150 | 10,530 | 10,090 |
Gas Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 294 | 279 | 997 | 927 |
Commercial Renewables [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 119 | 110 | 220 | 238 |
Total Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 5,628 | 5,539 | 11,747 | 11,255 |
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 15 | 16 | 31 | 29 |
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment income (loss) | 641 | 782 | 1,527 | 1,575 |
Segment assets | 137,617 |  | 137,617 |  |
Operating Segments [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 5,223 | 5,158 | 10,546 | 10,105 |
Segment income (loss) | 575 | 729 | 1,325 | 1,364 |
Segment assets | 121,947 |  | 121,947 |  |
Operating Segments [Member] | Gas Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 318 | 301 | 1,045 | 971 |
Segment income (loss) | 28 | 27 | 144 | 160 |
Segment assets | 11,437 |  | 11,437 |  |
Operating Segments [Member] | Commercial Renewables [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 119 | 110 | 220 | 238 |
Segment income (loss) | 38 | 26 | 58 | 51 |
Segment assets | 4,233 |  | 4,233 |  |
Operating Segments [Member] | Total Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 5,660 | 5,569 | 11,811 | 11,314 |
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | (49) | (49) | (100) | (98) |
Segment assets | 181 |  | 181 |  |
Intersegment Eliminations [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 8 | 8 | 16 | 15 |
Intersegment Eliminations [Member] | Gas Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 24 | 22 | 48 | 44 |
Intersegment Eliminations [Member] | Total Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 32 | 30 | 64 | 59 |
Intersegment Eliminations [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 17 | 19 | 36 | 39 |
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment income (loss) | (136) | (94) | (402) | (171) |
Segment assets | 2,461 |  | 2,461 |  |
Corporate, Non-Segment [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 32 | 35 | 67 | 68 |
Duke Energy Ohio [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 459 | 437 | 983 | 955 |
Segment income (loss) | 46 | 30 | 21 | 72 |
Segment assets | 8,101 |  | 8,101 |  | $ 7,875
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 346 | 329 | 682 | 665 |
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 103 | 100 | 277 | 270 |
Duke Energy Ohio [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 449 | 429 | 959 | 935 |
Segment income (loss) | 57 | 39 | 124 | 88 |
Segment assets | 8,063 |  | 8,063 |  |
Duke Energy Ohio [Member] | Operating Segments [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment income (loss) | 39 | 22 | 72 | 46 |
Segment assets | 5,336 |  | 5,336 |  |
Duke Energy Ohio [Member] | Operating Segments [Member] | Gas Utilities and Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment income (loss) | 18 | 17 | 52 | 42 |
Segment assets | 2,727 |  | 2,727 |  |
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 | 10 | 8 | 24 | 20 |
Segment income (loss) | (11) | $ (9) | (103) | $ (16) |
Segment assets | $ 40 |  | $ 40 |  |

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