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Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | $ 6,721 | $ 6,940 | $ 18,091 | $ 18,976 |
Segment income (loss) | 1,265 | 1,327 | 1,347 | 3,047 |
Less: Noncontrolling interests | (70) | (19) | (208) | (110) |
Add: Preferred stock dividend | 39 | 15 | 93 | 27 |
Net Income | 1,234 | 1,323 | 1,232 | 2,964 |
Segment assets | 161,409 |  | 161,409 |  | $ 158,838
Impairment charges | 28 | (20) | 36 | (16) |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 1,339 | 1,511 | 1,158 | 3,388 |
Equity in losses (earnings) of unconsolidated affiliates | 80 | (50) | 2,004 | (137) |
Electric Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 6,371 | 6,569 | 16,571 | 17,357 |
Gas Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 217 | 225 | 1,122 | 1,239 |
Commercial Renewables |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 126 | 138 | 378 | 362 |
Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 6,714 | 6,932 | 18,071 | 18,958 |
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 7 | 8 | 20 | 18 |
Operating Segments | Electric Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 6,379 | 6,577 | 16,596 | 17,381 |
Segment income (loss) | 1,381 | 1,385 | 2,839 | 2,944 |
Segment assets | 138,142 |  | 138,142 |  |
Operating Segments | Gas Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 241 | 249 | 1,194 | 1,311 |
Segment income (loss) | (73) | 26 | (1,400) | 292 |
Segment assets | 13,343 |  | 13,343 |  |
Equity in losses (earnings) of unconsolidated affiliates | (78) |  | (2,100) |  |
Operating Segments | Commercial Renewables |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 126 | 138 | 378 | 362 |
Segment income (loss) | 60 | 40 | 207 | 139 |
Segment assets | 6,541 |  | 6,541 |  |
Operating Segments | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 6,746 | 6,964 | 18,168 | 19,054 |
Segment income (loss) | 1,368 | 1,451 | 1,646 | 3,375 |
Segment assets | 158,026 |  | 158,026 |  |
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  |  | 98 |  |
Other | Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 24 | 25 | 73 | 71 |
Segment income (loss) | (103) | (124) | (299) | (328) |
Segment assets | 3,387 |  | 3,387 |  |
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | (49) | (49) | (150) | (149) |
Segment assets | (4) |  | (4) |  |
Eliminations | Electric Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 8 | 8 | 25 | 24 |
Eliminations | Gas Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 24 | 24 | 72 | 72 |
Eliminations | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 32 | 32 | 97 | 96 |
Eliminations | Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 17 | 17 | 53 | 53 |
Duke Energy Carolinas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 2,058 | 2,162 | 5,416 | 5,619 |
Segment assets | 45,048 |  | 45,048 |  | 44,053
Impairment charges | 20 | 6 | 22 | 11 |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 631 | 708 | 1,306 | 1,439 |
Duke Energy Ohio |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 473 | 489 | 1,394 | 1,453 |
Segment income (loss) | 70 | 74 | 201 | 190 |
Segment assets | 9,749 |  | 9,749 |  | 9,338
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 84 | 85 | 241 | 224 |
Duke Energy Ohio | Operating Segments | Electric Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 394 | 408 | 1,070 | 1,099 |
Segment income (loss) | 63 | 62 | 137 | 129 |
Segment assets | 6,448 |  | 6,448 |  |
Duke Energy Ohio | Operating Segments | Gas Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 79 | 81 | 324 | 354 |
Segment income (loss) | 9 | 13 | 68 | 65 |
Segment assets | 3,297 |  | 3,297 |  |
Duke Energy Ohio | Operating Segments | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 473 | 489 | 1,394 | 1,453 |
Segment income (loss) | 72 | 75 | 205 | 194 |
Segment assets | 9,745 |  | 9,745 |  |
Duke Energy Ohio | Other | Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment income (loss) | (2) | (1) | (4) | (4) |
Segment assets | 27 |  | 27 |  |
Duke Energy Ohio | Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment assets | (23) |  | (23) |  |
Duke Energy Progress |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 1,626 | 1,688 | 4,207 | 4,559 |
Segment assets | 33,861 |  | 33,861 |  | 33,377
Impairment charges | 5 |  | 5 |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 357 | 326 | 790 | 775 |
Piedmont Natural Gas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 162 | 168 | 871 | 956 |
Segment assets | 8,212 |  | 8,212 |  | 7,756
Impairment charges | 7 |  | 7 |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | (30) | (28) | 161 | 119 |
Equity in losses (earnings) of unconsolidated affiliates |  |  | (7) | (6) |
Duke Energy Florida |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 1,567 | 1,548 | 3,897 | 3,987 |
Segment assets | 20,815 |  | 20,815 |  | $ 20,454
Impairment charges | (4) | (25) | (4) | (25) |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 365 | 346 | 782 | 715 |
ACP | ACP |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Equity in losses (earnings) of unconsolidated affiliates |  |  | 2,100 |  |
ACP | Piedmont Natural Gas | ACP |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment charges |  |  | (7) |  |
Operations, maintenance and other | Duke Energy Carolinas | Operating Segments | Electric Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 8 |  | 8 |  |
Operations, maintenance and other | Duke Energy Progress | Operating Segments | Electric Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 8 |  | 8 |  |
Impairment charges | Duke Energy Carolinas | Operating Segments | Electric Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment charges | 19 |  | 19 |  |
Impairment charges | Piedmont Natural Gas | Operating Segments | Gas Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment charges | 7 |  |  |  |
Impairment charges | Duke Energy Florida | Operating Segments | Electric Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Reduction of prior year impairment |  |  |  | $ 25 |
Impairment charges | ACP | Duke Energy Progress | Operating Segments | Electric Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment charges | $ 5 |  | $ 5 |  |
Revision of Prior Period, Adjustment [Member] | Impairment charges | Duke Energy Florida | Operating Segments | Electric Utilities and Infrastructure |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment charges |  | $ (25) |  |  |

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