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Investments in Debt and Equity Securities (Estimated Fair Value of Investments in Debt and Equity Securities) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale |  |
Estimated Fair Value | $ 3,202 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 5,680 | $ 5,019
Unrealized Holding Losses | 187 | 171
Estimated Fair Value | 11,513 | 10,603
NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 151 | 133
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 5,612 | 4,942
Gross Unrealized Holding Losses | 23 | 22
Estimated Fair Value | 7,859 | 7,278
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 2,933 | 2,732
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 5,629 | 4,985
Unrealized Holding Losses | 171 | 159
Estimated Fair Value | 10,943 | 10,143
Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 124 | 31
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 51 | 33
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 177 | 158
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 269 | 271
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 51 | 34
Unrealized Holding Losses | 16 | 12
Estimated Fair Value | 570 | 460
Duke Energy Carolinas |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,584 |
Duke Energy Carolinas | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 57 | 51
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 3,254 | 2,886
Gross Unrealized Holding Losses | 16 | 14
Estimated Fair Value | 4,527 | 4,196
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,584 | 1,438
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 3,259 | 2,904
Unrealized Holding Losses | 111 | 99
Estimated Fair Value | 6,168 | 5,685
Progress Energy |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,372 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 2,370 | 2,081
Unrealized Holding Losses | 61 | 61
Estimated Fair Value | 4,823 | 4,499
Progress Energy | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 94 | 82
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2,358 | 2,056
Gross Unrealized Holding Losses | 7 | 8
Estimated Fair Value | 3,332 | 3,082
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,349 | 1,294
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 2,370 | 2,081
Unrealized Holding Losses | 60 | 60
Estimated Fair Value | 4,775 | 4,458
Progress Energy | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 25 | 18
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 23 | 23
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 0 | 0
Unrealized Holding Losses | 1 | 1
Estimated Fair Value | 48 | 41
Duke Energy Progress |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,143 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 2,254 | 1,979
Unrealized Holding Losses | 48 | 46
Estimated Fair Value | 4,443 | 4,089
Duke Energy Progress | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 77 | 55
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2,243 | 1,956
Gross Unrealized Holding Losses | 7 | 8
Estimated Fair Value | 3,205 | 2,970
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,143 | 1,050
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 2,254 | 1,979
Unrealized Holding Losses | 48 | 46
Estimated Fair Value | 4,425 | 4,075
Duke Energy Progress | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 18 | 14
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 0 | 0
Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 18 | 14
Duke Energy Florida |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 229 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 116 | 102
Unrealized Holding Losses | 13 | 15
Estimated Fair Value | 376 | 409
Duke Energy Florida | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 17 | 27
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 115 | 100
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 127 | 112
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 206 | 244
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 116 | 102
Unrealized Holding Losses | 12 | 14
Estimated Fair Value | 350 | 383
Duke Energy Florida | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 3 | 3
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 23 | 23
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 0 | 0
Unrealized Holding Losses | 1 | 1
Estimated Fair Value | 26 | 26
Duke Energy Indiana |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 62 |
Duke Energy Indiana | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 2 | 1
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 15 | 4
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 110 | 98
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 62 | 64
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 15 | 5
Unrealized Holding Losses | 1 | 1
Estimated Fair Value | 174 | 163
Corporate debt securities | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 7 | 12
Gross Unrealized Holding Losses | 44 | 43
Estimated Fair Value | 691 | 632
Corporate debt securities | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 6 | 6
Estimated Fair Value | 91 | 82
Corporate debt securities | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 2 | 4
Gross Unrealized Holding Losses | 37 | 35
Estimated Fair Value | 424 | 390
Corporate debt securities | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 5 | 8
Gross Unrealized Holding Losses | 7 | 8
Estimated Fair Value | 267 | 242
Corporate debt securities | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 4 | 7
Gross Unrealized Holding Losses | 7 | 8
Estimated Fair Value | 254 | 229
Corporate debt securities | Duke Energy Florida | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 1
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 13 | 13
Corporate debt securities | Duke Energy Indiana | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 7 | 8
Municipal bonds | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 3 | 6
Gross Unrealized Holding Losses | 15 | 16
Estimated Fair Value | 330 | 347
Municipal bonds | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 1
Gross Unrealized Holding Losses | 2 | 2
Estimated Fair Value | 81 | 77
Municipal bonds | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 4 | 4
Estimated Fair Value | 41 | 50
Municipal bonds | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 3 | 6
Gross Unrealized Holding Losses | 11 | 12
Estimated Fair Value | 289 | 297
Municipal bonds | Progress Energy | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 1 | 1
Estimated Fair Value | 23 | 23
Municipal bonds | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 3 | 6
Gross Unrealized Holding Losses | 11 | 12
Estimated Fair Value | 289 | 297
Municipal bonds | Duke Energy Florida | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 1 | 1
Estimated Fair Value | 23 | 23
Municipal bonds | Duke Energy Indiana | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 1
Gross Unrealized Holding Losses | 1 | 1
Estimated Fair Value | 47 | 46
U.S. government bonds | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 6 | 24
Gross Unrealized Holding Losses | 79 | 65
Estimated Fair Value | 1,668 | 1,575
U.S. government bonds | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 4 | 2
Estimated Fair Value | 50 | 65
U.S. government bonds | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 2 | 13
Gross Unrealized Holding Losses | 44 | 33
Estimated Fair Value | 894 | 826
U.S. government bonds | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 4 | 11
Gross Unrealized Holding Losses | 35 | 32
Estimated Fair Value | 774 | 749
U.S. government bonds | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 4 | 10
Gross Unrealized Holding Losses | 23 | 18
Estimated Fair Value | 583 | 518
U.S. government bonds | Duke Energy Florida | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 1
Gross Unrealized Holding Losses | 12 | 14
Estimated Fair Value | 191 | 231
U.S. government bonds | Duke Energy Indiana | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 8 | 10
Other debt securities | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 1
Gross Unrealized Holding Losses | 10 | 13
Estimated Fair Value | 244 | 178
Other debt securities | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 4 | 2
Estimated Fair Value | 47 | 47
Other debt securities | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 1
Gross Unrealized Holding Losses | 10 | 13
Estimated Fair Value | 225 | 172
Other debt securities | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 19 | 6
Other debt securities | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 17 | 6
Other debt securities | Duke Energy Florida | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | $ 2 | $ 0

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