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Investments in Debt and Equity Securities (Estimated Fair Value of Investments in Debt and Equity Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale |  |
Estimated Fair Value | $ 3,326 |
Total Investments |  |
Unrealized Holding Gains | 5,804 | $ 5,019
Unrealized Holding Losses | 219 | 171
Estimated Fair Value | 11,905 | 10,603
NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 5,753 | 4,942
Gross Unrealized Holding Losses | 61 | 22
Estimated Fair Value | 8,233 | 7,278
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 3,060 | 2,732
Total Investments |  |
Unrealized Holding Gains | 5,765 | 4,985
Unrealized Holding Losses | 200 | 159
Estimated Fair Value | 11,432 | 10,143
NDTF | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 139 | 133
NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 6 | 12
Gross Unrealized Holding Losses | 33 | 43
Estimated Fair Value | 673 | 632
NDTF | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 2 | 6
Gross Unrealized Holding Losses | 14 | 16
Estimated Fair Value | 342 | 347
NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 3 | 24
Gross Unrealized Holding Losses | 84 | 65
Estimated Fair Value | 1,806 | 1,575
NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 1
Gross Unrealized Holding Losses | 8 | 13
Estimated Fair Value | 239 | 178
Other Investments |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 39 | 33
Gross Unrealized Holding Losses | 4 |
Estimated Fair Value | 160 | 158
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 266 | 271
Total Investments |  |
Unrealized Holding Gains | 39 | 34
Unrealized Holding Losses | 19 | 12
Estimated Fair Value | 473 | 460
Other Investments | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 47 | 31
Other Investments | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 5 | 6
Estimated Fair Value | 79 | 82
Other Investments | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 1
Gross Unrealized Holding Losses | 1 | 2
Estimated Fair Value | 83 | 77
Other Investments | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 5 | 2
Estimated Fair Value | 59 | 65
Other Investments | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 4 | 2
Estimated Fair Value | 45 | 47
Duke Energy Carolinas |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,651 |
Duke Energy Carolinas | NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 3,386 | 2,886
Gross Unrealized Holding Losses | 33 | 14
Estimated Fair Value | 4,751 | 4,196
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,651 | 1,438
Total Investments |  |
Unrealized Holding Gains | 3,389 | 2,904
Unrealized Holding Losses | 122 | 99
Estimated Fair Value | 6,464 | 5,685
Duke Energy Carolinas | NDTF | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 62 | 51
Duke Energy Carolinas | NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 2 | 4
Gross Unrealized Holding Losses | 27 | 35
Estimated Fair Value | 401 | 390
Duke Energy Carolinas | NDTF | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 4 | 4
Estimated Fair Value | 36 | 50
Duke Energy Carolinas | NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 13
Gross Unrealized Holding Losses | 50 | 33
Estimated Fair Value | 991 | 826
Duke Energy Carolinas | NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 1
Gross Unrealized Holding Losses | 8 | 13
Estimated Fair Value | 223 | 172
Progress Energy |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,433 |
Total Investments |  |
Unrealized Holding Gains | 2,376 | 2,081
Unrealized Holding Losses | 78 | 61
Estimated Fair Value | 5,015 | 4,499
Progress Energy | NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2,367 | 2,056
Gross Unrealized Holding Losses | 28 | 8
Estimated Fair Value | 3,482 | 3,082
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,409 | 1,294
Total Investments |  |
Unrealized Holding Gains | 2,376 | 2,081
Unrealized Holding Losses | 78 | 60
Estimated Fair Value | 4,968 | 4,458
Progress Energy | NDTF | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 77 | 82
Progress Energy | NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 4 | 8
Gross Unrealized Holding Losses | 6 | 8
Estimated Fair Value | 272 | 242
Progress Energy | NDTF | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 2 | 6
Gross Unrealized Holding Losses | 10 | 12
Estimated Fair Value | 306 | 297
Progress Energy | NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 3 | 11
Gross Unrealized Holding Losses | 34 | 32
Estimated Fair Value | 815 | 749
Progress Energy | NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 16 | 6
Progress Energy | Other Investments |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 24 | 23
Total Investments |  |
Unrealized Holding Losses |  | 1
Estimated Fair Value | 47 | 41
Progress Energy | Other Investments | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 23 | 18
Progress Energy | Other Investments | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses |  | 1
Estimated Fair Value | 24 | 23
Duke Energy Progress |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,221 |
Total Investments |  |
Unrealized Holding Gains | 2,265 | 1,979
Unrealized Holding Losses | 70 | 46
Estimated Fair Value | 4,653 | 4,089
Duke Energy Progress | NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2,256 | 1,956
Gross Unrealized Holding Losses | 28 | 8
Estimated Fair Value | 3,362 | 2,970
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,221 | 1,050
Total Investments |  |
Unrealized Holding Gains | 2,265 | 1,979
Unrealized Holding Losses | 70 | 46
Estimated Fair Value | 4,637 | 4,075
Duke Energy Progress | NDTF | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 54 | 55
Duke Energy Progress | NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 4 | 7
Gross Unrealized Holding Losses | 6 | 8
Estimated Fair Value | 256 | 229
Duke Energy Progress | NDTF | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 2 | 6
Gross Unrealized Holding Losses | 10 | 12
Estimated Fair Value | 306 | 297
Duke Energy Progress | NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 3 | 10
Gross Unrealized Holding Losses | 26 | 18
Estimated Fair Value | 645 | 518
Duke Energy Progress | NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 14 | 6
Duke Energy Progress | Other Investments |  |
Total Investments |  |
Estimated Fair Value | 16 | 14
Duke Energy Progress | Other Investments | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 16 | 14
Duke Energy Florida |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 212 |
Total Investments |  |
Unrealized Holding Gains | 111 | 102
Unrealized Holding Losses | 8 | 15
Estimated Fair Value | 358 | 409
Duke Energy Florida | NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 111 | 100
Estimated Fair Value | 120 | 112
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 188 | 244
Total Investments |  |
Unrealized Holding Gains | 111 | 102
Unrealized Holding Losses | 8 | 14
Estimated Fair Value | 331 | 383
Duke Energy Florida | NDTF | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 23 | 27
Duke Energy Florida | NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 1
Estimated Fair Value | 16 | 13
Duke Energy Florida | NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 1
Gross Unrealized Holding Losses | 8 | 14
Estimated Fair Value | 170 | 231
Duke Energy Florida | NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 2 |
Duke Energy Florida | Other Investments |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 24 | 23
Total Investments |  |
Unrealized Holding Losses |  | 1
Estimated Fair Value | 27 | 26
Duke Energy Florida | Other Investments | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 3 | 3
Duke Energy Florida | Other Investments | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses |  | 1
Estimated Fair Value | 24 | 23
Duke Energy Indiana |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 56 |
Total Investments |  |
Unrealized Holding Gains |  | 5
Unrealized Holding Losses | 5 | 1
Estimated Fair Value | 146 | 163
Duke Energy Indiana | Other Investments |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains |  | 4
Gross Unrealized Holding Losses | 4 |
Estimated Fair Value | 89 | 98
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 56 | 64
Duke Energy Indiana | Other Investments | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 1 | 1
Duke Energy Indiana | Other Investments | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 6 | 8
Duke Energy Indiana | Other Investments | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 1
Gross Unrealized Holding Losses | 1 | 1
Estimated Fair Value | 43 | 46
Duke Energy Indiana | Other Investments | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | $ 7 | $ 10

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