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Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | $ 23,868 | $ 25,079 | $ 24,521 |
Interest expense | 2,162 | 2,204 | 2,094 |
Depreciation and amortization | 4,705 | 4,548 | 4,074 |
Equity in (losses) earnings of unconsolidated affiliates | (2,005) | 162 | 83 |
Income tax expense (benefit) from continuing operations | (236) | 519 | 448 |
Segment income (loss) | 1,263 | 3,714 | 2,647 |
Add back noncontrolling interests component | 295 | 177 | 22 |
Add back preferred stock dividend | 107 | 41 |  |
Loss from discontinued operations, net of tax | 7 | (7) | 19 |
Net income (loss) | 1,377 | 3,748 | 2,666 |
Capital expenditures | 10,421 | 11,446 | 9,668 |
Segment assets | 162,388 | 158,838 | 145,392 |
Segment Reporting Information Assets [Abstract] |  |  |  |
After-tax severance charges | (85) | 16 | 187 |
Duke Energy Ohio |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 1,858 | 1,940 | 1,957 |
Interest expense | 102 | 109 | 92 |
Depreciation and amortization | 278 | 265 | 268 |
Income tax expense (benefit) from continuing operations | 43 | 40 | 43 |
Segment income (loss) | 252 | 239 | 176 |
Loss from discontinued operations, net of tax |  | (1) |  |
Net income (loss) | 252 | 238 | 176 |
Capital expenditures | 834 | 952 | 827 |
Segment assets | 10,025 | 9,338 | 8,555 |
Segment Reporting Information Assets [Abstract] |  |  |  |
After-tax severance charges |  |  | 6 |
Eliminations |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | (199) | (200) | (199) |
Interest expense | (16) | (58) | (45) |
Depreciation and amortization | (29) | (5) | (1) |
Segment assets |  | 188 | 188 |
Eliminations | Duke Energy Ohio |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Segment assets | (2) |  |  |
Electric Utilities and Infrastructure |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 21,687 | 22,798 | 22,242 |
Equity in (losses) earnings of unconsolidated affiliates | (1) | 9 | 6 |
Segment Reporting Information Assets [Abstract] |  |  |  |
After tax impairment charge | 948 |  |  |
Reduction of prior year impairment | 152 |  |  |
Tax Act |  |  |  | $ 24
Shareholder Contribution expense | 16 |  |  |
Electric Utilities and Infrastructure | After-tax impairment charge |  |  |  |
Segment Reporting Information Assets [Abstract] |  |  |  |
After tax impairment charge |  |  | 46 |
Electric Utilities and Infrastructure | Regulatory settlements |  |  |  |
Segment Reporting Information Assets [Abstract] |  |  |  |
Regulatory settlement charges |  |  | 202 |
Electric Utilities and Infrastructure | Clemson University Combined Heat and Power Plant |  |  |  |
Segment Reporting Information Assets [Abstract] |  |  |  |
After tax impairment charge | 19 |  |  |
Electric Utilities and Infrastructure | Gas Pipeline Assets |  |  |  |
Segment Reporting Information Assets [Abstract] |  |  |  |
After tax impairment charge | 5 |  |  |
Electric Utilities and Infrastructure | Operating Segments |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 21,720 | 22,831 | 22,273 |
Interest expense | 1,320 | 1,345 | 1,288 |
Depreciation and amortization | 4,068 | 3,951 | 3,523 |
Equity in (losses) earnings of unconsolidated affiliates | (1) | 9 | 5 |
Income tax expense (benefit) from continuing operations | 340 | 785 | 799 |
Segment income (loss) | 2,669 | 3,536 | 3,058 |
Capital expenditures | 7,629 | 8,263 | 8,086 |
Segment assets | 138,225 | 135,561 | 125,364 |
Segment Reporting Information Assets [Abstract] |  |  |  |
Reduction of prior year impairment |  | 27 |  |
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Ohio |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 1,405 | 1,456 | 1,450 |
Interest expense | 85 | 80 | 67 |
Depreciation and amortization | 200 | 182 | 183 |
Income tax expense (benefit) from continuing operations | 19 | 20 | 47 |
Segment income (loss) | 162 | 159 | 186 |
Capital expenditures | 548 | 680 | 655 |
Segment assets | 6,615 | 6,188 | 5,643 |
Electric Utilities and Infrastructure | Eliminations |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 33 | 33 | 31 |
Gas Utilities and Infrastructure |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 1,653 | 1,770 | 1,783 |
Equity in (losses) earnings of unconsolidated affiliates | (2,017) | 114 | 27 |
Segment Reporting Information Assets [Abstract] |  |  |  |
After tax impairment charge | 7 |  |  |
Tax Act |  |  |  | 1
Gas Utilities and Infrastructure | After-tax impairment charge |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Equity in (losses) earnings of unconsolidated affiliates | 2,100 |  |  |
Segment Reporting Information Assets [Abstract] |  |  |  |
After tax impairment charge |  | 19 | 42 |
Gas Utilities and Infrastructure | Operating Segments |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 1,748 | 1,866 | 1,881 |
Interest expense | 135 | 117 | 106 |
Depreciation and amortization | 258 | 256 | 245 |
Equity in (losses) earnings of unconsolidated affiliates | (2,017) | 114 | 27 |
Income tax expense (benefit) from continuing operations | (349) | 22 | 78 |
Segment income (loss) | (1,266) | 432 | 274 |
Capital expenditures | 1,309 | 1,539 | 1,133 |
Segment assets | 13,849 | 13,921 | 12,361 |
Gas Utilities and Infrastructure | Operating Segments | Duke Energy Ohio |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 453 | 484 | 506 |
Interest expense | 17 | 29 | 24 |
Depreciation and amortization | 78 | 83 | 85 |
Income tax expense (benefit) from continuing operations | 26 | 21 | 24 |
Segment income (loss) | 96 | 85 | 93 |
Capital expenditures | 286 | 272 | 172 |
Segment assets | 3,380 | 3,116 | 2,874 |
Gas Utilities and Infrastructure | Eliminations |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 95 | 96 | 98 |
Commercial Renewables |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 502 | 487 | 477 |
Equity in (losses) earnings of unconsolidated affiliates |  | (4) | (1) |
Segment Reporting Information Assets [Abstract] |  |  |  |
Tax Act |  |  |  | 3
Commercial Renewables | Noncontrolling Interests |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues |  |  | 91 |
Segment Reporting Information Assets [Abstract] |  |  |  |
After tax impairment charge |  |  | 2 |
Commercial Renewables | Operating Segments |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 502 | 487 | 477 |
Interest expense | 66 | 95 | 88 |
Depreciation and amortization | 199 | 168 | 155 |
Equity in (losses) earnings of unconsolidated affiliates |  | (4) | (1) |
Income tax expense (benefit) from continuing operations | (65) | (115) | (147) |
Segment income (loss) | 286 | 198 | 9 |
Capital expenditures | 1,219 | 1,423 | 193 |
Segment assets | 6,716 | 6,020 | 4,204 |
Total Reportable Segments |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 23,842 | 25,055 | 24,502 |
Total Reportable Segments | Operating Segments |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 23,970 | 25,184 | 24,631 |
Interest expense | 1,521 | 1,557 | 1,482 |
Depreciation and amortization | 4,525 | 4,375 | 3,923 |
Equity in (losses) earnings of unconsolidated affiliates | (2,018) | 119 | 31 |
Income tax expense (benefit) from continuing operations | (74) | 692 | 730 |
Segment income (loss) | 1,689 | 4,166 | 3,341 |
Capital expenditures | 10,157 | 11,225 | 9,412 |
Segment assets | 158,790 | 155,502 | 141,929 |
Total Reportable Segments | Operating Segments | Duke Energy Ohio |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 1,858 | 1,940 | 1,956 |
Interest expense | 102 | 109 | 91 |
Depreciation and amortization | 278 | 265 | 268 |
Income tax expense (benefit) from continuing operations | 45 | 41 | 71 |
Segment income (loss) | 258 | 244 | 279 |
Capital expenditures | 834 | 952 | 827 |
Segment assets | 9,995 | 9,304 | 8,517 |
Total Reportable Segments | Eliminations |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 128 | 129 | 129 |
Other |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 26 | 24 | 19 |
Segment Reporting Information Assets [Abstract] |  |  |  |
Tax Act |  |  |  | $ 2
Costs to achieve mergers, acquisition costs |  |  | 65 |
Other | Other |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 97 | 95 | 89 |
Interest expense | 657 | 705 | 657 |
Depreciation and amortization | 209 | 178 | 152 |
Equity in (losses) earnings of unconsolidated affiliates | 13 | 43 | 52 |
Income tax expense (benefit) from continuing operations | (162) | (173) | (282) |
Segment income (loss) | (426) | (452) | (694) |
Capital expenditures | 264 | 221 | 256 |
Segment assets | 3,598 | 3,148 | 3,275 |
Other | Other | Duke Energy Ohio |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues |  |  | 1 |
Interest expense |  |  | 1 |
Income tax expense (benefit) from continuing operations | (2) | (1) | (28) |
Segment income (loss) | (6) | (5) | (103) |
Segment assets | 32 | 34 | 38 |
Other | Eliminations |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Revenues | 71 | 71 | 70 |
Other |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |
Equity in (losses) earnings of unconsolidated affiliates | 13 | $ 43 | 51 |
Segment Reporting Information Assets [Abstract] |  |  |  |
After-tax severance charges |  |  | 144 |
Loss in disposal |  |  | $ 82 |
Severance Charge Reversal | $ 98 |  |  |

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- Definition Total expenditures for long-lived assets additions other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. + References No definition available. + Details
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