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Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 6,103 | $ 6,940 | $ 5,873 | $ 6,163 | $ 6,115 | $ 6,628 | $ 5,643 | $ 6,135 | $ 25,079 | $ 24,521 | $ 23,565
Interest expense |  |  |  |  |  |  |  |  | 2,204 | 2,094 | 1,986
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,548 | 4,074 | 3,527
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 162 | 83 | 119
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  | 519 | 448 | 1,196
Segment income (loss) |  |  |  |  |  |  |  |  | 3,714 | 2,647 | 3,065
Add back noncontrolling interests component |  |  |  |  |  |  |  |  | (177) | (22) | 5
Add back preferred stock dividend |  |  |  |  |  |  |  |  | 41 |  |
(Loss) Income From Discontinued Operations, net of tax | (7) |  |  |  | 20 | 4 | (5) | 0 | (7) | 19 | (6)
Net income (loss) | 607 | 1,323 | 748 | 893 | 454 | 1,066 | 502 | 622 | 3,571 | 2,644 | 3,064
Net income (loss) attributable to parent |  |  |  |  | 464 | 1,082 | 500 | 620 | 3,748 | 2,666 | 3,059
Capital expenditures |  |  |  |  |  |  |  |  | 11,446 | 9,668 | 8,198
Segment assets | 158,838 |  |  |  | 145,392 |  |  |  | 158,838 | 145,392 | 137,914
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Reduction of prior year impairment | (14) | 25 |  |  |  |  |  |  | 11 |  |
After-tax severance charges |  |  |  |  | 187 |  |  |  | 16 | 187 | 15
After-tax loss on sale and retirement |  |  |  |  |  |  |  | (107) |  | (107) |
Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | 487 | 489 | 433 | 531 | 505 | 469 | 459 | 524 | 1,940 | 1,957 | 1,923
Interest expense |  |  |  |  |  |  |  |  | 109 | 92 | 91
Depreciation and amortization |  |  |  |  |  |  |  |  | 265 | 268 | 261
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  | 40 | 43 | 59
Segment income (loss) |  |  |  |  |  |  |  |  | 239 | 176 | 193
(Loss) Income From Discontinued Operations, net of tax |  |  |  |  |  |  |  |  | (1) |  | (1)
Net income (loss) attributable to parent | 48 | $ 74 | $ 47 | $ 69 | 55 | $ 100 | 46 | (25) | 238 | 176 | 192
Capital expenditures |  |  |  |  |  |  |  |  | 952 | 827 | 686
Segment assets | 9,338 |  |  |  | 8,555 |  |  |  | 9,338 | 8,555 | 7,875
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax Act |  |  |  |  | 2 |  |  |  |  | 2 |
After-tax severance charges |  |  |  |  | 6 |  |  |  |  | 6 |
After-tax loss on sale and retirement |  |  |  |  |  |  |  | 107 |  | 107 |
Regulatory settlements |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Regulatory settlement charges |  |  |  |  |  |  | $ 179 | $ 86 |  | 265 |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (22) | 5
Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (200) | (199) | (200)
Interest expense |  |  |  |  |  |  |  |  | (58) | (45) | (20)
Depreciation and amortization |  |  |  |  |  |  |  |  | (5) | (1) |
Segment assets | 188 |  |  |  | 188 |  |  |  | 188 | 188 | 188
Eliminations | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment assets |  |  |  |  |  |  |  |  |  |  | (15)
Electric Utilities and Infrastructure |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 22,798 | 22,242 | 21,300
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 9 | 6 | 5
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax Act |  |  |  |  |  |  |  |  |  | 24 | 231
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 | 98
Electric Utilities and Infrastructure | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 22,831 | 22,273 | 21,331
Interest expense |  |  |  |  |  |  |  |  | 1,345 | 1,288 | 1,240
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,951 | 3,523 | 3,010
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 9 | 5 | 5
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  | 785 | 799 | 1,355
Segment income (loss) |  |  |  |  |  |  |  |  | 3,536 | 3,058 | 3,210
Capital expenditures |  |  |  |  |  |  |  |  | 8,263 | 8,086 | 7,024
Segment assets | 135,561 |  |  |  | 125,364 |  |  |  | 135,561 | 125,364 | 119,423
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 |  |  |  |  |  |  |  |  | 1,456 | 1,450 | 1,373
Interest expense |  |  |  |  |  |  |  |  | 80 | 67 | 62
Depreciation and amortization |  |  |  |  |  |  |  |  | 182 | 183 | 178
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  | 20 | 47 | 40
Segment income (loss) |  |  |  |  |  |  |  |  | 159 | 186 | 138
Capital expenditures |  |  |  |  |  |  |  |  | 680 | 655 | 491
Segment assets | 6,188 |  |  |  | 5,643 |  |  |  | 6,188 | 5,643 | 5,066
Electric Utilities and Infrastructure | Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 33 | 31 | 31
Gas Utilities and Infrastructure |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,770 | 1,783 | 1,743
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 114 | 27 | 62
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax Act |  |  |  |  |  |  |  |  |  | 1 | 26
Gas Utilities and Infrastructure | After-tax impairment charge |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
After tax impairment charge |  |  |  |  |  |  |  |  | 19 | 42 |
Gas Utilities and Infrastructure | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,866 | 1,881 | 1,836
Interest expense |  |  |  |  |  |  |  |  | 117 | 106 | 105
Depreciation and amortization |  |  |  |  |  |  |  |  | 256 | 245 | 231
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 114 | 27 | 62
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  | 22 | 78 | 116
Segment income (loss) |  |  |  |  |  |  |  |  | 432 | 274 | 319
Capital expenditures |  |  |  |  |  |  |  |  | 1,539 | 1,133 | 907
Segment assets | 13,921 |  |  |  | 12,361 |  |  |  | 13,921 | 12,361 | 11,462
Gas Utilities and Infrastructure | Operating Segments | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 484 | 506 | 508
Interest expense |  |  |  |  |  |  |  |  | 29 | 24 | 28
Depreciation and amortization |  |  |  |  |  |  |  |  | 83 | 85 | 83
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  | 21 | 24 | 39
Segment income (loss) |  |  |  |  |  |  |  |  | 85 | 93 | 85
Capital expenditures |  |  |  |  |  |  |  |  | 272 | 172 | 195
Segment assets | 3,116 |  |  |  | 2,874 |  |  |  | 3,116 | 2,874 | 2,758
Gas Utilities and Infrastructure | Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 96 | 98 | 93
Commercial Renewables |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 487 | 477 | 460
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | (4) | (1) | (5)
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
After tax impairment charge |  |  |  |  |  |  |  |  |  | 91 | 74
Tax Act |  |  |  |  |  |  |  |  |  | 3 | 442
Commercial Renewables | Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
After tax impairment charge |  |  |  |  |  |  |  |  |  | 2 |
Commercial Renewables | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 487 | 477 | 460
Interest expense |  |  |  |  |  |  |  |  | 95 | 88 | 87
Depreciation and amortization |  |  |  |  |  |  |  |  | 168 | 155 | 155
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | (4) | (1) | (5)
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  | (115) | (147) | (628)
Segment income (loss) |  |  |  |  |  |  |  |  | 198 | 9 | 441
Capital expenditures |  |  |  |  |  |  |  |  | 1,423 | 193 | 92
Segment assets | 6,020 |  |  |  | 4,204 |  |  |  | 6,020 | 4,204 | 4,156
Commercial Renewables | Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 |  | 0
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 43 | 51 | 57
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
After-tax severance charges |  |  |  |  |  |  |  |  |  | 144 |
After-tax loss on sale and retirement |  |  |  |  |  |  |  |  |  | 82 |
Total Reportable Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 25,055 | 24,502 | 23,503
Total Reportable Segments | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 25,184 | 24,631 | 23,627
Interest expense |  |  |  |  |  |  |  |  | 1,557 | 1,482 | 1,432
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,375 | 3,923 | 3,396
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 119 | 31 | 62
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  | 692 | 730 | 843
Segment income (loss) |  |  |  |  |  |  |  |  | 4,166 | 3,341 | 3,970
Capital expenditures |  |  |  |  |  |  |  |  | 11,225 | 9,412 | 8,023
Segment assets | 155,502 |  |  |  | 141,929 |  |  |  | 155,502 | 141,929 | 135,041
Total Reportable Segments | Operating Segments | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,940 | 1,956 | 1,881
Interest expense |  |  |  |  |  |  |  |  | 109 | 91 | 90
Depreciation and amortization |  |  |  |  |  |  |  |  | 265 | 268 | 261
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  | 41 | 71 | 79
Segment income (loss) |  |  |  |  |  |  |  |  | 244 | 279 | 223
Capital expenditures |  |  |  |  |  |  |  |  | 952 | 827 | 686
Segment assets | 9,304 |  |  |  | 8,517 |  |  |  | 9,304 | 8,517 | 7,824
Total Reportable Segments | Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 129 | 129 | 124
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 24 | 19 | 62
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax Act |  |  |  |  |  |  |  |  |  | 2 | 597
Costs to achieve mergers, acquisition costs |  |  |  |  |  |  |  |  |  | 65 | 64
Other | Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 71 | 70 | 76
Other | Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 95 | 89 | 138
Interest expense |  |  |  |  |  |  |  |  | 705 | 657 | 574
Depreciation and amortization |  |  |  |  |  |  |  |  | 178 | 152 | 131
Equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 43 | 52 | 57
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  | (173) | (282) | 353
Segment income (loss) |  |  |  |  |  |  |  |  | (452) | (694) | (905)
Capital expenditures |  |  |  |  |  |  |  |  | 221 | 256 | 175
Segment assets | 3,148 |  |  |  | 3,275 |  |  |  | 3,148 | 3,275 | 2,685
Other | Other | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1 | 42
Interest expense |  |  |  |  |  |  |  |  |  | 1 | 1
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  | (1) | (28) | (20)
Segment income (loss) |  |  |  |  |  |  |  |  | (5) | (103) | (30)
Segment assets | $ 34 |  |  |  | $ 38 |  |  |  | $ 34 | $ 38 | $ 66

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