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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting Information [Line Items] |
Business Segment Data | Business segment information is presented in the following tables. Segment assets presented exclude intercompany assets.
| Year Ended December 31, 2018
| Electric |  |  | Gas |  |  |  |  | Total |  |  |  |  |  |  |
| Utilities and |  |  | Utilities and |  |  | Commercial |  |  | Reportable |  |  |  |  |  |  |
(in millions) | Infrastructure |  |  | Infrastructure |  |  | Renewables |  |  | Segments |  |  | Other |  |  | Eliminations |  |  | Total |
Unaffiliated Revenues | $ | 22,242 |  |  | $ | 1,783 |  |  | $ | 477 |  |  | $ | 24,502 |  |  | $ | 19 |  |  | $ | — |  |  | $ | 24,521 |
Intersegment Revenues | 31 |  |  | 98 |  |  | — |  |  | 129 |  |  | 70 |  |  | (199 | ) |  | — |
Total Revenues | $ | 22,273 |  |  | $ | 1,881 |  |  | $ | 477 |  |  | $ | 24,631 |  |  | $ | 89 |  |  | $ | (199 | ) |  | $ | 24,521 |
Interest Expense | $ | 1,288 |  |  | $ | 106 |  |  | $ | 88 |  |  | $ | 1,482 |  |  | $ | 657 |  |  | $ | (45 | ) |  | $ | 2,094 |
Depreciation and amortization | 3,523 |  |  | 245 |  |  | 155 |  |  | 3,923 |  |  | 152 |  |  | (1 | ) |  | 4,074 |
Equity in earnings (losses) of unconsolidated affiliates | 5 |  |  | 27 |  |  | (1 | ) |  | 31 |  |  | 52 |  |  | — |  |  | 83 |
Income tax expense (benefit)(a) | 799 |  |  | 78 |  |  | (147 | ) |  | 730 |  |  | (282 | ) |  | — |  |  | 448 |
Segment income (loss)(b)(c)(d)(e) | 3,058 |  |  | 274 |  |  | 9 |  |  | 3,341 |  |  | (694 | ) |  | — |  |  | 2,647 |
Add back noncontrolling interest component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (22 | )
Income from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 2,644 |
Capital investments expenditures and acquisitions | $ | 8,086 |  |  | $ | 1,133 |  |  | $ | 193 |  |  | $ | 9,412 |  |  | $ | 256 |  |  | $ | — |  |  | $ | 9,668 |
Segment assets | 125,364 |  |  | 12,361 |  |  | 4,204 |  |  | 141,929 |  |  | 3,275 |  |  | 188 |  |  | 145,392 |
(a) | All segments include adjustments to the December 31, 2017 estimate of the income tax effects of the Tax Act. Electric Utilities and Infrastructure includes a $24 million expense, Gas Utilities and Infrastructure includes a $1 million expense, Commercial Renewables includes a $3 million benefit and Other includes a $2 million benefit. See Note 23 for additional information.
(b) | Electric Utilities and Infrastructure includes after-tax regulatory and legislative impairment charges of $202 million related to rate case orders, settlements or other actions of regulators or legislative bodies and an after-tax impairment charge of $46 million related to the Citrus County CC at Duke Energy Florida. See Note 4 for additional information.
(c) | Gas Utilities and Infrastructure includes an after-tax impairment charge of $42 million for the investment in Constitution. See Note 12 for additional information.
(d) | Commercial Renewables includes an impairment charge of $91 million, net of $2 million Noncontrolling interests, related to goodwill. See Note 11 for additional information.
(e) | Other includes $65 million of after-tax costs to achieve the Piedmont merger, $144 million of after-tax severance charges related to a companywide initiative and an $82 million after-tax loss on the sale of the retired Beckjord Generating Station described below. For additional information, see Note 2 for the Piedmont Merger and Note 20 for severance charges.
In February 2018, Duke Energy sold Beckjord, a nonregulated facility retired during 2014, and recorded a pretax loss of $106 million within (Losses) Gains on Sales of Other Assets and Other, net and $1 million within Operation, maintenance and other on Duke Energy's Consolidated Statements of Operations for the year ended December 31, 2018. The sale included the transfer of coal ash basins and other real property and indemnification from any and all potential future claims related to the property, whether arising under environmental laws or otherwise.
| Year Ended December 31, 2017
| Electric |  |  | Gas |  |  |  |  | Total |  |  |  |  |  |  |
| Utilities and |  |  | Utilities and |  |  | Commercial |  |  | Reportable |  |  |  |  |  |  |
(in millions) | Infrastructure |  |  | Infrastructure |  |  | Renewables |  |  | Segments |  |  | Other |  |  | Eliminations |  |  | Total |
Unaffiliated Revenues | $ | 21,300 |  |  | $ | 1,743 |  |  | $ | 460 |  |  | $ | 23,503 |  |  | $ | 62 |  |  | $ | — |  |  | $ | 23,565 |
Intersegment Revenues | 31 |  |  | 93 |  |  | — |  |  | 124 |  |  | 76 |  |  | (200 | ) |  | — |
Total Revenues | $ | 21,331 |  |  | $ | 1,836 |  |  | $ | 460 |  |  | $ | 23,627 |  |  | $ | 138 |  |  | $ | (200 | ) |  | $ | 23,565 |
Interest Expense | $ | 1,240 |  |  | $ | 105 |  |  | $ | 87 |  |  | $ | 1,432 |  |  | $ | 574 |  |  | $ | (20 | ) |  | $ | 1,986 |
Depreciation and amortization | 3,010 |  |  | 231 |  |  | 155 |  |  | 3,396 |  |  | 131 |  |  | — |  |  | 3,527 |
Equity in earnings (losses) of unconsolidated affiliates | 5 |  |  | 62 |  |  | (5 | ) |  | 62 |  |  | 57 |  |  | — |  |  | 119 |
Income tax expense (benefit)(a) | 1,355 |  |  | 116 |  |  | (628 | ) |  | 843 |  |  | 353 |  |  | — |  |  | 1,196 |
Segment income (loss)(b)(c)(d) | 3,210 |  |  | 319 |  |  | 441 |  |  | 3,970 |  |  | (905 | ) |  | — |  |  | 3,065 |
Add back noncontrolling interest component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6 | )
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 3,064 |
Capital investments expenditures and acquisitions | $ | 7,024 |  |  | $ | 907 |  |  | $ | 92 |  |  | $ | 8,023 |  |  | $ | 175 |  |  | $ | — |  |  | $ | 8,198 |
Segment assets | 119,423 |  |  | 11,462 |  |  | 4,156 |  |  | 135,041 |  |  | 2,685 |  |  | 188 |  |  | 137,914 |
(a) | All segments include impacts of the Tax Act. Electric Utilities and Infrastructure includes a $231 million benefit, Gas Utilities and Infrastructure includes a $26 million benefit, Commercial Renewables includes a $442 million benefit and Other includes charges of $597 million.
(b) | Electric Utilities and Infrastructure includes after-tax regulatory settlement charges of $98 million. See Note 4 for additional information.
(c) | Commercial Renewables includes after-tax impairment charges of $74 million related to certain wind projects and the Energy Management Solutions reporting unit. See Notes 10 and 11 for additional information.
(d) | Other includes $64 million of after-tax costs to achieve the Piedmont merger. See Note 2 for additional information.
| Year Ended December 31, 2016
| Electric |  |  | Gas |  |  |  |  | Total |  |  |  |  |  |  |
| Utilities and |  |  | Utilities and |  |  | Commercial |  |  | Reportable |  |  |  |  |  |  |
(in millions) | Infrastructure |  |  | Infrastructure |  |  | Renewables |  |  | Segments |  |  | Other |  |  | Eliminations |  |  | Total |
Unaffiliated Revenues | $ | 21,336 |  |  | $ | 875 |  |  | $ | 484 |  |  | $ | 22,695 |  |  | $ | 48 |  |  | $ | — |  |  | $ | 22,743 |
Intersegment Revenues | 30 |  |  | 26 |  |  | — |  |  | 56 |  |  | 69 |  |  | (125 | ) |  | — |
Total Revenues | $ | 21,366 |  |  | $ | 901 |  |  | $ | 484 |  |  | $ | 22,751 |  |  | $ | 117 |  |  | $ | (125 | ) |  | $ | 22,743 |
Interest Expense | $ | 1,136 |  |  | $ | 46 |  |  | $ | 53 |  |  | $ | 1,235 |  |  | $ | 693 |  |  | $ | (12 | ) |  | $ | 1,916 |
Depreciation and amortization | 2,897 |  |  | 115 |  |  | 130 |  |  | 3,142 |  |  | 152 |  |  | — |  |  | 3,294 |
Equity in earnings (losses) of unconsolidated affiliates(a) | 5 |  |  | 19 |  |  | (82 | ) |  | (58 | ) |  | 43 |  |  | — |  |  | (15 | )
Income tax expense (benefit) | 1,672 |  |  | 90 |  |  | (160 | ) |  | 1,602 |  |  | (446 | ) |  | — |  |  | 1,156 |
Segment income (loss)(b)(c) | 3,040 |  |  | 152 |  |  | 23 |  |  | 3,215 |  |  | (645 | ) |  | 1 |  |  | 2,571 |
Add back noncontrolling interest component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |
Loss from discontinued operations, net of tax(d) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (408 | )
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 2,170 |
Capital investments expenditures and acquisitions(e) | $ | 6,649 |  |  | $ | 5,519 |  |  | $ | 857 |  |  | $ | 13,025 |  |  | $ | 190 |  |  | $ | — |  |  | $ | 13,215 |
Segment assets | 114,993 |  |  | 10,760 |  |  | 4,377 |  |  | 130,130 |  |  | 2,443 |  |  | 188 |  |  | 132,761 |
(a) | Commercial Renewables includes a pretax impairment charge of $71 million. See Note 12 for additional information.
(b) | Other includes $329 million of after-tax costs to achieve mergers. See Note 2 for additional information on costs related to the Piedmont merger.
(c) | Other includes after-tax charges of $57 million related to cost savings initiatives. See Note 20 for further information.
(d) | Includes a loss on sale of the International Disposal Group. Refer to Note 2 for further information.
(e) | Other includes $26 million of capital investment expenditures related to the International Disposal Group. Gas Utilities and Infrastructure includes the Piedmont acquisition of $5 billion. See Note 2 for more information on the Piedmont acquisition.
Schedule of Revenue, By Products and Services | Products and Services The following table summarizes revenues of the reportable segments by type.
| Retail |  |  | Wholesale |  |  | Retail |  |  |  |  | Total |
(in millions) | Electric |  |  | Electric |  |  | Natural Gas |  |  | Other |  |  | Revenues |
2018 |  |  |  |  |  |  |  |  |
Electric Utilities and Infrastructure | $ | 19,013 |  |  | $ | 2,345 |  |  | $ | — |  |  | $ | 915 |  |  | $ | 22,273 |
Gas Utilities and Infrastructure | — |  |  | — |  |  | 1,817 |  |  | 64 |  |  | 1,881 |
Commercial Renewables | — |  |  | 375 |  |  | — |  |  | 102 |  |  | 477 |
Total Reportable Segments | $ | 19,013 |  |  | $ | 2,720 |  |  | $ | 1,817 |  |  | $ | 1,081 |  |  | $ | 24,631 |
2017 |  |  |  |  |  |  |  |  |
Electric Utilities and Infrastructure | $ | 18,177 |  |  | $ | 2,104 |  |  | $ | — |  |  | $ | 1,050 |  |  | $ | 21,331 |
Gas Utilities and Infrastructure | — |  |  | — |  |  | 1,732 |  |  | 104 |  |  | 1,836 |
Commercial Renewables | — |  |  | 375 |  |  | — |  |  | 85 |  |  | 460 |
Total Reportable Segments | $ | 18,177 |  |  | $ | 2,479 |  |  | $ | 1,732 |  |  | $ | 1,239 |  |  | $ | 23,627 |
2016 |  |  |  |  |  |  |  |  |
Electric Utilities and Infrastructure | $ | 18,338 |  |  | $ | 2,095 |  |  | $ | — |  |  | $ | 933 |  |  | $ | 21,366 |
Gas Utilities and Infrastructure | — |  |  | — |  |  | 871 |  |  | 30 |  |  | 901 |
Commercial Renewables | — |  |  | 303 |  |  | — |  |  | 181 |  |  | 484 |
Total Reportable Segments | $ | 18,338 |  |  | $ | 2,398 |  |  | $ | 871 |  |  | $ | 1,144 |  |  | $ | 22,751 |
Duke Energy Ohio [Member] |
Segment Reporting Information [Line Items] |
Business Segment Data |
| Year Ended December 31, 2018
| Electric |  |  | Gas |  |  | Total |  |  |  |  |
| Utilities and |  |  | Utilities and |  |  | Reportable |  |  |  |  |
(in millions) | Infrastructure |  |  | Infrastructure |  |  | Segments |  |  | Other |  |  | Total |
Total revenues | $ | 1,450 |  |  | $ | 506 |  |  | $ | 1,956 |  |  | $ | 1 |  |  | $ | 1,957 |
Interest expense | $ | 67 |  |  | $ | 24 |  |  | $ | 91 |  |  | $ | 1 |  |  | $ | 92 |
Depreciation and amortization | 183 |  |  | 85 |  |  | 268 |  |  | — |  |  | 268 |
Income tax expense (benefit) | 47 |  |  | 24 |  |  | 71 |  |  | (28 | ) |  | 43 |
Segment income (loss)/Net income(a) | 186 |  |  | 93 |  |  | 279 |  |  | (103 | ) |  | 176 |
Capital expenditures | $ | 655 |  |  | $ | 172 |  |  | $ | 827 |  |  | $ | — |  |  | $ | 827 |
Segment assets | 5,643 |  |  | 2,874 |  |  | 8,517 |  |  | 38 |  |  | 8,555 |
(a) Other includes the loss on the sale of Beckjord, see discussion above.
| Year Ended December 31, 2017
| Electric |  |  | Gas |  |  | Total |  |  |  |  |  |  |
| Utilities and |  |  | Utilities and |  |  | Reportable |  |  |  |  |  |  |
(in millions) | Infrastructure |  |  | Infrastructure |  |  | Segments |  |  | Other |  |  | Eliminations |  |  | Total |
Total revenues | $ | 1,373 |  |  | $ | 508 |  |  | $ | 1,881 |  |  | $ | 42 |  |  | $ | — |  |  | $ | 1,923 |
Interest expense | $ | 62 |  |  | $ | 28 |  |  | $ | 90 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 91 |
Depreciation and amortization | 178 |  |  | 83 |  |  | 261 |  |  | — |  |  | — |  |  | 261 |
Income tax expense (benefit) | 40 |  |  | 39 |  |  | 79 |  |  | (20 | ) |  | — |  |  | 59 |
Segment income (loss) | 138 |  |  | 85 |  |  | 223 |  |  | (30 | ) |  | — |  |  | 193 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | (1 | )
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 192 |
Capital expenditures | $ | 491 |  |  | $ | 195 |  |  | $ | 686 |  |  | $ | — |  |  | $ | — |  |  | $ | 686 |
Segment assets | 5,066 |  |  | 2,758 |  |  | 7,824 |  |  | 66 |  |  | (15 | ) |  | 7,875 |
| Year Ended December 31, 2016
| Electric |  |  | Gas |  |  | Total |  |  |  |  |  |  |
| Utilities and |  |  | Utilities and |  |  | Reportable |  |  |  |  |  |  |
(in millions) | Infrastructure |  |  | Infrastructure |  |  | Segments |  |  | Other |  |  | Eliminations |  |  | Total |
Total revenues | $ | 1,410 |  |  | $ | 503 |  |  | $ | 1,913 |  |  | $ | 31 |  |  | $ | — |  |  | $ | 1,944 |
Interest expense | $ | 58 |  |  | $ | 27 |  |  | $ | 85 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 86 |
Depreciation and amortization | 151 |  |  | 80 |  |  | 231 |  |  | 2 |  |  | — |  |  | 233 |
Income tax expense (benefit) | 55 |  |  | 44 |  |  | 99 |  |  | (21 | ) |  | — |  |  | 78 |
Segment income (loss) | 154 |  |  | 77 |  |  | 231 |  |  | (39 | ) |  | — |  |  | 192 |
Income from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | 36 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 228 |
Capital expenditures | $ | 322 |  |  | $ | 154 |  |  | $ | 476 |  |  | $ | — |  |  | $ | — |  |  | $ | 476 |
Segment assets | 4,782 |  |  | 2,696 |  |  | 7,478 |  |  | 62 |  |  | (12 | ) |  | 7,528 |

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