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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, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale |  |
Estimated Fair Value | $ 3,003 |
Total Investments |  |
Unrealized Holding Gains | 5,019 | $ 3,682
Unrealized Holding Losses | 171 | 395
Estimated Fair Value | 10,603 | 9,051
NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 4,942 | 3,658
Gross Unrealized Holding Losses | 22 | 105
Estimated Fair Value | 7,278 | 5,871
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 2,732 | 2,550
Total Investments |  |
Unrealized Holding Gains | 4,985 | 3,661
Unrealized Holding Losses | 159 | 359
Estimated Fair Value | 10,143 | 8,636
NDTF | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 133 | 215
NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 12 | 1
Gross Unrealized Holding Losses | 43 | 85
Estimated Fair Value | 632 | 641
NDTF | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 6 |
Gross Unrealized Holding Losses | 16 | 39
Estimated Fair Value | 347 | 330
NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 24 | 2
Gross Unrealized Holding Losses | 65 | 112
Estimated Fair Value | 1,575 | 1,423
NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 13 | 18
Estimated Fair Value | 178 | 156
Other Investments |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 33 | 21
Gross Unrealized Holding Losses |  | 16
Estimated Fair Value | 158 | 128
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 271 | 265
Total Investments |  |
Unrealized Holding Gains | 34 | 21
Unrealized Holding Losses | 12 | 36
Estimated Fair Value | 460 | 415
Other Investments | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 31 | 22
Other Investments | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 6 | 12
Estimated Fair Value | 82 | 84
Other Investments | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 2 | 3
Estimated Fair Value | 77 | 78
Other Investments | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 2 | 2
Estimated Fair Value | 65 | 62
Other Investments | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 2 | 3
Estimated Fair Value | 47 | 41
Duke Energy Carolinas |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,438 |
Duke Energy Carolinas | NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2,886 | 2,147
Gross Unrealized Holding Losses | 14 | 51
Estimated Fair Value | 4,196 | 3,367
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,438 | 1,298
Total Investments |  |
Unrealized Holding Gains | 2,904 | 2,149
Unrealized Holding Losses | 99 | 192
Estimated Fair Value | 5,685 | 4,782
Duke Energy Carolinas | NDTF | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 51 | 117
Duke Energy Carolinas | NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 4 | 1
Gross Unrealized Holding Losses | 35 | 62
Estimated Fair Value | 390 | 401
Duke Energy Carolinas | NDTF | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 4 | 10
Estimated Fair Value | 50 | 64
Duke Energy Carolinas | NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 13 | 1
Gross Unrealized Holding Losses | 33 | 51
Estimated Fair Value | 826 | 685
Duke Energy Carolinas | NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 13 | 18
Estimated Fair Value | 172 | 148
Progress Energy |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,317 |
Total Investments |  |
Unrealized Holding Gains | 2,081 | 1,512
Unrealized Holding Losses | 61 | 167
Estimated Fair Value | 4,499 | 3,890
Progress Energy | NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2,056 | 1,511
Gross Unrealized Holding Losses | 8 | 54
Estimated Fair Value | 3,082 | 2,504
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,294 | 1,252
Total Investments |  |
Unrealized Holding Gains | 2,081 | 1,512
Unrealized Holding Losses | 60 | 167
Estimated Fair Value | 4,458 | 3,854
Progress Energy | NDTF | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 82 | 98
Progress Energy | NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 8 |
Gross Unrealized Holding Losses | 8 | 23
Estimated Fair Value | 242 | 240
Progress Energy | NDTF | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 6 |
Gross Unrealized Holding Losses | 12 | 29
Estimated Fair Value | 297 | 266
Progress Energy | NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 11 | 1
Gross Unrealized Holding Losses | 32 | 61
Estimated Fair Value | 749 | 738
Progress Energy | NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 6 | 8
Progress Energy | Other Investments |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 23 | 25
Total Investments |  |
Unrealized Holding Losses | 1 |
Estimated Fair Value | 41 | 36
Progress Energy | Other Investments | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 18 | 11
Progress Energy | Other Investments | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 1 |
Estimated Fair Value | 23 | 25
Duke Energy Progress |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,050 |
Total Investments |  |
Unrealized Holding Gains | 1,979 | 1,432
Unrealized Holding Losses | 46 | 142
Estimated Fair Value | 4,089 | 3,439
Duke Energy Progress | NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 1,956 | 1,431
Gross Unrealized Holding Losses | 8 | 54
Estimated Fair Value | 2,970 | 2,411
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,050 | 963
Total Investments |  |
Unrealized Holding Gains | 1,979 | 1,432
Unrealized Holding Losses | 46 | 142
Estimated Fair Value | 4,075 | 3,430
Duke Energy Progress | NDTF | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 55 | 56
Duke Energy Progress | NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 7 |
Gross Unrealized Holding Losses | 8 | 22
Estimated Fair Value | 229 | 230
Duke Energy Progress | NDTF | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 6 |
Gross Unrealized Holding Losses | 12 | 29
Estimated Fair Value | 297 | 266
Duke Energy Progress | NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 10 | 1
Gross Unrealized Holding Losses | 18 | 37
Estimated Fair Value | 518 | 460
Duke Energy Progress | NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 6 | 7
Duke Energy Progress | Other Investments |  |
Total Investments |  |
Estimated Fair Value | 14 | 9
Duke Energy Progress | Other Investments | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 14 | 9
Duke Energy Florida |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 267 |
Total Investments |  |
Unrealized Holding Gains | 102 | 80
Unrealized Holding Losses | 15 | 25
Estimated Fair Value | 409 | 450
Duke Energy Florida | NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 100 | 80
Estimated Fair Value | 112 | 93
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 244 | 289
Total Investments |  |
Unrealized Holding Gains | 102 | 80
Unrealized Holding Losses | 14 | 25
Estimated Fair Value | 383 | 424
Duke Energy Florida | NDTF | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 27 | 42
Duke Energy Florida | NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses |  | 1
Estimated Fair Value | 13 | 10
Duke Energy Florida | NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 14 | 24
Estimated Fair Value | 231 | 278
Duke Energy Florida | NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value |  | 1
Duke Energy Florida | Other Investments |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 23 | 25
Total Investments |  |
Unrealized Holding Losses | 1 |
Estimated Fair Value | 26 | 26
Duke Energy Florida | Other Investments | Cash and cash equivalents |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 3 | 1
Duke Energy Florida | Other Investments | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 1 |
Estimated Fair Value | 23 | 25
Duke Energy Indiana |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 64 |
Total Investments |  |
Unrealized Holding Gains | 5 | 2
Unrealized Holding Losses | 1 | 20
Estimated Fair Value | 163 | 140
Duke Energy Indiana | Other Investments |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 4 | 2
Gross Unrealized Holding Losses |  | 16
Estimated Fair Value | 98 | 79
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 64 | 60
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 |  |
Gross Unrealized Holding Losses |  | 1
Estimated Fair Value | 8 | 8
Duke Energy Indiana | Other Investments | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 1 | 3
Estimated Fair Value | 46 | 45
Duke Energy Indiana | Other Investments | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | $ 10 | $ 7

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