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Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | $ 25,097 | $ 23,868 | $ 25,079
Interest expense | 2,280 | 2,162 | 2,204
Depreciation and amortization | 4,990 | 4,705 | 4,548
Equity in earnings (losses) of unconsolidated affiliates | 28 | (2,005) | 162
Income tax expense (benefit) from continuing operations | 192 | (236) | 519
Segment income (loss) | 3,795 | 1,263 | 3,714
Less noncontrolling interest | 329 | 295 | 177
Add back preferred stock dividend | 106 | 107 | 41
Loss from discontinued operations, net of tax | 7 | 7 | (7)
Net income | 3,579 | 1,082 | 3,571
Net (loss) income attributable to Duke Energy | 3,908 | 1,377 | 3,748
Capital expenditures | 9,752 | 10,421 | 11,446
Segment assets | 169,587 | 162,388 | 158,838
Segment Reporting Information Assets [Abstract] |  |  |
Impairment of assets and other charges | 356 | 984 | (8)
Total income (loss) from continuing operations before income taxes | 3,764 | 839 | 4,097
Nonregulated electric and other | 770 | 765 | 705
Income (loss) attributable to noncontrolling interest | (329) | (295) | (177)
Duke Energy Ohio |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 2,037 | 1,858 | 1,940
Interest expense | 111 | 102 | 109
Depreciation and amortization | 307 | 278 | 265
Income tax expense (benefit) from continuing operations | 30 | 43 | 40
Segment income (loss) | 204 | 252 | 239
Loss from discontinued operations, net of tax |  |  | (1)
Net (loss) income attributable to Duke Energy | 204 | 252 | 238
Capital expenditures | 848 | 834 | 952
Segment assets | 10,774 | 10,025 | 9,338
Segment Reporting Information Assets [Abstract] |  |  |
Impairment of assets and other charges | 25 |  |
Total income (loss) from continuing operations before income taxes | 234 | 295 | 279
Duke Energy Carolinas |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 7,102 | 7,015 | 7,395
Interest expense | 538 | 487 | 463
Depreciation and amortization | 1,468 | 1,462 | 1,388
Income tax expense (benefit) from continuing operations | 51 | 88 | 311
Net (loss) income attributable to Duke Energy | 1,336 | 956 | 1,403
Segment assets | 47,162 | 45,048 |
Segment Reporting Information Assets [Abstract] |  |  |
Impairment of assets and other charges | 227 | 476 | 17
Total income (loss) from continuing operations before income taxes | 1,387 | 1,044 | 1,714
Duke Energy Progress |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 5,780 | 5,422 | 5,957
Interest expense | 306 | 269 | 306
Depreciation and amortization | 1,097 | 1,116 | 1,143
Income tax expense (benefit) from continuing operations | 75 | (36) | 157
Net (loss) income attributable to Duke Energy | 991 | 415 | 805
Segment assets | 35,383 | 33,733 |
Segment Reporting Information Assets [Abstract] |  |  |
Impairment of assets and other charges | 63 | 499 | 12
Total income (loss) from continuing operations before income taxes | 1,066 | 379 | 962
Eliminations |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | (205) | (199) | (200)
Interest expense | (9) | (16) | (58)
Depreciation and amortization | (26) | (29) | (5)
Segment assets |  |  | 188
Eliminations | Duke Energy Ohio |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Segment assets | (29) | (2) |
Electric Utilities and Infrastructure |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 22,570 | 21,687 | 22,798
Equity in earnings (losses) of unconsolidated affiliates | 7 | (1) | 9
Segment Reporting Information Assets [Abstract] |  |  |
After tax impairment charge |  | 948 |
Reduction of prior year impairment |  | 152 |
Shareholder contribution expense |  | 16 |
Electric Utilities and Infrastructure | Gas Pipeline Assets |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
After tax impairment charge |  | 5 |
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 | Operating Segments |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 22,603 | 21,720 | 22,831
Interest expense | 1,432 | 1,320 | 1,345
Depreciation and amortization | 4,251 | 4,068 | 3,951
Equity in earnings (losses) of unconsolidated affiliates | 7 | (1) | 9
Income tax expense (benefit) from continuing operations | 494 | 340 | 785
Segment income (loss) | 3,850 | 2,669 | 3,536
Capital expenditures | 7,653 | 7,629 | 8,263
Segment assets | 143,841 | 138,225 | 135,561
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 | 1,493 | 1,405 | 1,456
Interest expense | 87 | 85 | 80
Depreciation and amortization | 217 | 200 | 182
Income tax expense (benefit) from continuing operations | 15 | 19 | 20
Segment income (loss) | 141 | 162 | 159
Capital expenditures | 486 | 548 | 680
Segment assets | 6,882 | 6,615 | 6,188
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Impairment Charges |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Impairment of assets and other charges | 160 |  |
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Other Income and Expense |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 77 |  |
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Operation, Maintenance and Other |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 5 |  |
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Regulated Operating Revenue, Electric, Non-Nuclear |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 13 |  |
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Interest Expense |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 3 |  |
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Depreciation and amortization |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 6 |  |
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Impairment Charges |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Impairment of assets and other charges | 42 |  |
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Other Income and Expense |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 34 |  |
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Operation, Maintenance and Other |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 7 |  |
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Regulated Operating Revenue, Electric, Non-Nuclear |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 15 |  |
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Interest Expense |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 5 |  |
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Depreciation and amortization |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 1 |  |
Electric Utilities and Infrastructure | Eliminations |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 33 | 33 | 33
Gas Utilities and Infrastructure |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 2,022 | 1,653 | 1,770
Equity in earnings (losses) of unconsolidated affiliates | 8 | (2,017) | 114
Segment Reporting Information Assets [Abstract] |  |  |
After tax impairment charge |  | 7 |
Gas Utilities and Infrastructure | After-tax impairment charge |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  | 2,100 |
Segment Reporting Information Assets [Abstract] |  |  |
After tax impairment charge |  |  | 19
Gas Utilities and Infrastructure | Operating Segments |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 2,112 | 1,748 | 1,866
Interest expense | 142 | 135 | 117
Depreciation and amortization | 303 | 258 | 256
Equity in earnings (losses) of unconsolidated affiliates | 8 | (2,017) | 114
Income tax expense (benefit) from continuing operations | 55 | (349) | 22
Segment income (loss) | 396 | (1,266) | 432
Capital expenditures | 1,271 | 1,309 | 1,539
Segment assets | 15,179 | 13,849 | 13,921
Gas Utilities and Infrastructure | Operating Segments | Duke Energy Ohio |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 544 | 453 | 484
Interest expense | 24 | 17 | 29
Depreciation and amortization | 90 | 78 | 83
Income tax expense (benefit) from continuing operations | 19 | 26 | 21
Segment income (loss) | 78 | 96 | 85
Capital expenditures | 362 | 286 | 272
Segment assets | 3,892 | 3,380 | 3,116
Gas Utilities and Infrastructure | Operating Segments | Gas Pipeline Assets |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Equity in earnings (losses) of unconsolidated affiliates | 20 |  |
Gas Utilities and Infrastructure | Eliminations |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 90 | 95 | 96
Commercial Renewables |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 476 | 502 | 487
Equity in earnings (losses) of unconsolidated affiliates | (34) |  | (4)
Commercial Renewables | Operating Segments |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 476 | 502 | 487
Interest expense | 72 | 66 | 95
Depreciation and amortization | 225 | 199 | 168
Equity in earnings (losses) of unconsolidated affiliates | (34) |  | (4)
Income tax expense (benefit) from continuing operations | (78) | (65) | (115)
Segment income (loss) | 201 | 286 | 198
Capital expenditures | 543 | 1,219 | 1,423
Segment assets | 6,977 | 6,716 | 6,020
Commercial Renewables | Operating Segments | Texas Storm Uri |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Equity in earnings (losses) of unconsolidated affiliates | 29 |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | (35) |  |
Nonregulated electric and other | 8 |  |
Income (loss) attributable to noncontrolling interest | (12) |  |
Commercial Renewables | Operating Segments | Texas Storm Uri | Operation, Maintenance and Other |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 2 |  |
Total Reportable Segments |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 25,068 | 23,842 | 25,055
Total Reportable Segments | Operating Segments |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 25,191 | 23,970 | 25,184
Interest expense | 1,646 | 1,521 | 1,557
Depreciation and amortization | 4,779 | 4,525 | 4,375
Equity in earnings (losses) of unconsolidated affiliates | (19) | (2,018) | 119
Income tax expense (benefit) from continuing operations | 471 | (74) | 692
Segment income (loss) | 4,447 | 1,689 | 4,166
Capital expenditures | 9,467 | 10,157 | 11,225
Segment assets | 165,997 | 158,790 | 155,502
Total Reportable Segments | Operating Segments | Duke Energy Ohio |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 2,037 | 1,858 | 1,940
Interest expense | 111 | 102 | 109
Depreciation and amortization | 307 | 278 | 265
Income tax expense (benefit) from continuing operations | 34 | 45 | 41
Segment income (loss) | 219 | 258 | 244
Capital expenditures | 848 | 834 | 952
Segment assets | 10,774 | 9,995 | 9,304
Total Reportable Segments | Eliminations |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 123 | 128 | 129
Other |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 29 | 26 | 24
Segment Reporting Information Assets [Abstract] |  |  |
Severance charge reversal |  | 98 |
Other | Operating Segments | Duke Energy Carolinas | Impairment Charges |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Impairment of assets and other charges | 133 |  |
Other | Operating Segments | Duke Energy Progress | Operation, Maintenance and Other |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 42 |  |
Other | Operating Segments | Duke Energy Progress | Depreciation and amortization |  |  |
Segment Reporting Information Assets [Abstract] |  |  |
Total income (loss) from continuing operations before income taxes | 17 |  |
Other | Other |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | 111 | 97 | 95
Interest expense | 643 | 657 | 705
Depreciation and amortization | 237 | 209 | 178
Equity in earnings (losses) of unconsolidated affiliates | 47 | 13 | 43
Income tax expense (benefit) from continuing operations | (279) | (162) | (173)
Segment income (loss) | (652) | (426) | (452)
Capital expenditures | 285 | 264 | 221
Segment assets | 3,590 | 3,598 | 3,148
Other | Other | Duke Energy Ohio |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Income tax expense (benefit) from continuing operations | (4) | (2) | (1)
Segment income (loss) | (15) | (6) | (5)
Segment assets | 29 | 32 | 34
Other | Eliminations |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Revenues | $ 82 | $ 71 | $ 71

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