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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020
| Electric |  | Gas |  |  |  | Total |  |  |  |  |  |
| Utilities and |  | Utilities and |  | Commercial |  | Reportable |  |  |  |  |  |
(in millions) | Infrastructure |  | Infrastructure |  | Renewables |  | Segments |  | Other |  | Eliminations |  | Total
Unaffiliated Revenues | $ | 21,687 |  |  | $ | 1,653 |  |  | $ | 502 |  |  | $ | 23,842 |  |  | $ | 26 |  |  | $ | — |  |  | $ | 23,868 |
Intersegment Revenues | 33 |  |  | 95 |  |  | — |  |  | 128 |  |  | 71 |  |  | (199) |  |  | — |
Total Revenues | $ | 21,720 |  |  | $ | 1,748 |  |  | $ | 502 |  |  | $ | 23,970 |  |  | $ | 97 |  |  | $ | (199) |  |  | $ | 23,868 |
Interest Expense | $ | 1,320 |  |  | $ | 135 |  |  | $ | 66 |  |  | $ | 1,521 |  |  | $ | 657 |  |  | $ | (16) |  |  | $ | 2,162 |
Depreciation and amortization | 4,068 |  |  | 258 |  |  | 199 |  |  | 4,525 |  |  | 209 |  |  | (29) |  |  | 4,705 |
Equity in earnings (losses) of unconsolidated affiliates | (1) |  |  | (2,017) |  |  | — |  |  | (2,018) |  |  | 13 |  |  | — |  |  | (2,005) |
Income tax expense (benefit) | 340 |  |  | (349) |  |  | (65) |  |  | (74) |  |  | (162) |  |  | — |  |  | (236) |
Segment income (loss)(a)(b)(c) | 2,669 |  |  | (1,266) |  |  | 286 |  |  | 1,689 |  |  | (426) |  |  | — |  |  | 1,263 |
Less noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | 295 |
Add back preferred stock dividend |  |  |  |  |  |  |  |  |  |  |  |  | 107 |
Income from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 7 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  | $ | 1,082 |
Capital investments expenditures and acquisitions | $ | 7,629 |  |  | $ | 1,309 |  |  | $ | 1,219 |  |  | $ | 10,157 |  |  | $ | 264 |  |  | $ | — |  |  | $ | 10,421 |
Segment assets | 138,225 |  |  | 13,849 |  |  | 6,716 |  |  | 158,790 |  |  | 3,598 |  |  | — |  |  | 162,388 |
(a) Electric Utilities and Infrastructure includes $948 million of Impairment charges and a reversal of $152 million included in Regulated electric operating revenue related to the CCR Settlement Agreement filed with the NCUC. Additionally, Electric Utilities and Infrastructure includes $19 million of Impairment charges related to the Clemson University Combined Heat and Power Plant, $5 million of Impairment charges related to the gas pipeline assets and $16 million of shareholder contributions within Operations, maintenance and other related to Duke Energy Carolinas' and Duke Energy Progress' 2019 North Carolina rate cases. See Note 3 for additional information. (b) Gas Utilities and Infrastructure includes $2.1 billion recorded within Equity in (losses) earnings of unconsolidated affiliates and $7 million of Impairment charges related to gas pipeline investments. See Notes 3 and 12 for additional information. (c) Other includes a $98 million reversal of 2018 severance costs due to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case. See Note 3 and 20 for additional information.
| Year Ended December 31, 2019
| Electric |  | Gas |  |  |  | Total |  |  |  |  |  |
| Utilities and |  | Utilities and |  | Commercial |  | Reportable |  |  |  |  |  |
(in millions) | Infrastructure |  | Infrastructure |  | Renewables |  | Segments |  | Other |  | Eliminations |  | Total
Unaffiliated Revenues | $ | 22,798 |  |  | $ | 1,770 |  |  | $ | 487 |  |  | $ | 25,055 |  |  | $ | 24 |  |  | $ | — |  |  | $ | 25,079 |
Intersegment Revenues | 33 |  |  | 96 |  |  | — |  |  | 129 |  |  | 71 |  |  | (200) |  |  | — |
Total Revenues | $ | 22,831 |  |  | $ | 1,866 |  |  | $ | 487 |  |  | $ | 25,184 |  |  | $ | 95 |  |  | $ | (200) |  |  | $ | 25,079 |
Interest Expense | $ | 1,345 |  |  | $ | 117 |  |  | $ | 95 |  |  | $ | 1,557 |  |  | $ | 705 |  |  | $ | (58) |  |  | $ | 2,204 |
Depreciation and amortization | 3,951 |  |  | 256 |  |  | 168 |  |  | 4,375 |  |  | 178 |  |  | (5) |  |  | 4,548 |
Equity in earnings (losses) of unconsolidated affiliates | 9 |  |  | 114 |  |  | (4) |  |  | 119 |  |  | 43 |  |  | — |  |  | 162 |
Income tax expense (benefit) | 785 |  |  | 22 |  |  | (115) |  |  | 692 |  |  | (173) |  |  | — |  |  | 519 |
Segment income (loss)(a)(b) | 3,536 |  |  | 432 |  |  | 198 |  |  | 4,166 |  |  | (452) |  |  | — |  |  | 3,714 |
Less noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | 177 |
Add back preferred stock dividend |  |  |  |  |  |  |  |  |  |  |  |  | 41 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | (7) |
Net income |  |  |  |  |  |  |  |  |  |  |  |  | $ | 3,571 |
Capital investments expenditures and acquisitions | $ | 8,263 |  |  | $ | 1,539 |  |  | $ | 1,423 |  |  | $ | 11,225 |  |  | $ | 221 |  |  | $ | — |  |  | $ | 11,446 |
Segment assets | 135,561 |  |  | 13,921 |  |  | 6,020 |  |  | 155,502 |  |  | 3,148 |  |  | 188 |  |  | 158,838 |
(a) Electric Utilities and Infrastructure includes a $27 million reduction of a prior year impairment at Citrus County CC related to the plant's cost cap. See Note 3 for additional information. (b) Gas Utilities and Infrastructure includes an after-tax impairment charge of $19 million for the remaining investment in Constitution. See Note 12 for additional information.
| 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 |
Less noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | 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 3 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 Beckjord described below. For additional information, see Note 1 for the Piedmont merger and Note 20 for severance charges.
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
2020 |  |  |  |  |  |  |  |  |  |  |
Electric Utilities and Infrastructure | $ | 18,898 |  |  | $ | 1,878 |  |  | $ | — |  |  |  |  | $ | 944 |  |  | $ | 21,720 |
Gas Utilities and Infrastructure | — |  |  | — |  |  | 1,691 |  |  |  |  | 57 |  |  | 1,748 |
Commercial Renewables | — |  |  | 434 |  |  | — |  |  |  |  | 68 |  |  | 502 |
Total Reportable Segments | $ | 18,898 |  |  | $ | 2,312 |  |  | $ | 1,691 |  |  |  |  | $ | 1,069 |  |  | $ | 23,970 |
2019 |  |  |  |  |  |  |  |  |  |  |
Electric Utilities and Infrastructure | $ | 19,745 |  |  | $ | 2,231 |  |  | $ | — |  |  |  |  | $ | 855 |  |  | $ | 22,831 |
Gas Utilities and Infrastructure | — |  |  | — |  |  | 1,782 |  |  |  |  | 84 |  |  | 1,866 |
Commercial Renewables | — |  |  | 389 |  |  | — |  |  |  |  | 98 |  |  | 487 |
Total Reportable Segments | $ | 19,745 |  |  | $ | 2,620 |  |  | $ | 1,782 |  |  |  |  | $ | 1,037 |  |  | $ | 25,184 |
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 |
Duke Energy Ohio |
Segment Reporting Information [Line Items] |
Business Segment Data |
| Year Ended December 31, 2020
| Electric |  | Gas |  | Total |  |  |  |  |  |
| Utilities and |  | Utilities and |  | Reportable |  |  |  |  |  |
(in millions) | Infrastructure |  | Infrastructure |  | Segments |  | Other |  | Eliminations |  | Total
Total revenues | $ | 1,405 |  |  | $ | 453 |  |  | $ | 1,858 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,858 |
Interest expense | $ | 85 |  |  | $ | 17 |  |  | $ | 102 |  |  | $ | — |  |  | $ | — |  |  | $ | 102 |
Depreciation and amortization | 200 |  |  | 78 |  |  | 278 |  |  | — |  |  | — |  |  | 278 |
Income tax expense (benefit) | 19 |  |  | 26 |  |  | 45 |  |  | (2) |  |  | — |  |  | 43 |
Segment income (loss)/Net income | 162 |  |  | 96 |  |  | 258 |  |  | (6) |  |  | — |  |  | 252 |
Capital expenditures | $ | 548 |  |  | $ | 286 |  |  | $ | 834 |  |  | $ | — |  |  | $ | — |  |  | $ | 834 |
Segment assets | 6,615 |  |  | 3,380 |  |  | 9,995 |  |  | 32 |  |  | (2) |  |  | 10,025 |
| Year Ended December 31, 2019
| Electric |  | Gas |  | Total |  |  |  |  |  |
| Utilities and |  | Utilities and |  | Reportable |  |  |  |  |  |
(in millions) | Infrastructure |  | Infrastructure |  | Segments |  | Other |  | Eliminations |  | Total
Total revenues | $ | 1,456 |  |  | $ | 484 |  |  | $ | 1,940 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,940 |
Interest expense | $ | 80 |  |  | $ | 29 |  |  | $ | 109 |  |  | $ | — |  |  | $ | — |  |  | $ | 109 |
Depreciation and amortization | 182 |  |  | 83 |  |  | 265 |  |  | — |  |  | — |  |  | 265 |
Income tax expense (benefit) | 20 |  |  | 21 |  |  | 41 |  |  | (1) |  |  | — |  |  | 40 |
Segment income (loss) | 159 |  |  | 85 |  |  | 244 |  |  | (5) |  |  | — |  |  | 239 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | (1) |
Net income |  |  |  |  |  |  |  |  |  |  | $ | 238 |
Capital expenditures | $ | 680 |  |  | $ | 272 |  |  | $ | 952 |  |  | $ | — |  |  | $ | — |  |  | $ | 952 |
Segment assets | 6,188 |  |  | 3,116 |  |  | 9,304 |  |  | 34 |  |  | — |  |  | 9,338 |
| Year Ended December 31, 2018
| Electric |  | Gas |  | Total |  |  |  |  |  |
| Utilities and |  | Utilities and |  | Reportable |  |  |  |  |  |
(in millions) | Infrastructure |  | Infrastructure |  | Segments |  | Other |  | Eliminations |  | 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.

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