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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, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale |  |
Estimated Fair Value | $ 3,565 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 6,289 | $ 5,804
Gross Unrealized Holding Losses | 150 | 219
Estimated Fair Value | 12,610 | 11,905
NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 145 | 139
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 6,210 | 5,753
Gross Unrealized Holding Losses | 36 | 61
Estimated Fair Value | 8,637 | 8,233
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 3,327 | 3,060
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 6,244 | 5,765
Gross Unrealized Holding Losses | 137 | 200
Estimated Fair Value | 12,109 | 11,432
Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 138 | 47
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 45 | 39
Gross Unrealized Holding Losses | 0 | 4
Estimated Fair Value | 125 | 160
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 238 | 266
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 45 | 39
Gross Unrealized Holding Losses | 13 | 19
Estimated Fair Value | 501 | 473
Duke Energy Carolinas |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,836 |
Duke Energy Carolinas | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 60 | 62
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 3,638 | 3,386
Gross Unrealized Holding Losses | 18 | 33
Estimated Fair Value | 4,983 | 4,751
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,836 | 1,651
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 3,655 | 3,389
Gross Unrealized Holding Losses | 84 | 122
Estimated Fair Value | 6,879 | 6,464
Progress Energy |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,514 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 2,589 | 2,376
Gross Unrealized Holding Losses | 54 | 78
Estimated Fair Value | 5,269 | 5,015
Progress Energy | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 85 | 77
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2,572 | 2,367
Gross Unrealized Holding Losses | 18 | 28
Estimated Fair Value | 3,654 | 3,482
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,491 | 1,409
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 2,589 | 2,376
Gross Unrealized Holding Losses | 53 | 78
Estimated Fair Value | 5,230 | 4,968
Progress Energy | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 16 | 23
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 23 | 24
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 1 | 0
Estimated Fair Value | 39 | 47
Duke Energy Progress |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,324 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 2,473 | 2,265
Gross Unrealized Holding Losses | 48 | 70
Estimated Fair Value | 4,933 | 4,653
Duke Energy Progress | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 67 | 54
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2,457 | 2,256
Gross Unrealized Holding Losses | 18 | 28
Estimated Fair Value | 3,531 | 3,362
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,324 | 1,221
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 2,473 | 2,265
Gross Unrealized Holding Losses | 48 | 70
Estimated Fair Value | 4,922 | 4,637
Duke Energy Progress | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 11 | 16
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 11 | 16
Duke Energy Florida |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 190 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 116 | 111
Gross Unrealized Holding Losses | 6 | 8
Estimated Fair Value | 333 | 358
Duke Energy Florida | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 18 | 23
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 115 | 111
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 123 | 120
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 167 | 188
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 116 | 111
Gross Unrealized Holding Losses | 5 | 8
Estimated Fair Value | 308 | 331
Duke Energy Florida | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 2 | 3
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 23 | 24
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 1 | 0
Estimated Fair Value | 25 | 27
Duke Energy Indiana |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 26 |
Duke Energy Indiana | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 2 | 1
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 0 | 4
Estimated Fair Value | 47 | 89
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 26 | 56
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 1 | 5
Estimated Fair Value | 75 | 146
Corporate debt securities | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 14 | 6
Gross Unrealized Holding Losses | 24 | 33
Estimated Fair Value | 822 | 673
Corporate debt securities | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 3 | 5
Estimated Fair Value | 77 | 79
Corporate debt securities | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 6 | 2
Gross Unrealized Holding Losses | 21 | 27
Estimated Fair Value | 501 | 401
Corporate debt securities | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 8 | 4
Gross Unrealized Holding Losses | 3 | 6
Estimated Fair Value | 321 | 272
Corporate debt securities | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 7 | 4
Gross Unrealized Holding Losses | 3 | 6
Estimated Fair Value | 302 | 256
Corporate debt securities | Duke Energy Florida | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 0
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 19 | 16
Corporate debt securities | Duke Energy Indiana | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 |
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 1 | 6
Municipal bonds | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 2
Gross Unrealized Holding Losses | 20 | 14
Estimated Fair Value | 355 | 342
Municipal bonds | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 2 | 1
Estimated Fair Value | 67 | 83
Municipal bonds | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 6 | 4
Estimated Fair Value | 38 | 36
Municipal bonds | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 2
Gross Unrealized Holding Losses | 14 | 10
Estimated Fair Value | 317 | 306
Municipal bonds | Progress Energy | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 1 | 0
Estimated Fair Value | 23 | 24
Municipal bonds | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 2
Gross Unrealized Holding Losses | 14 | 10
Estimated Fair Value | 317 | 306
Municipal bonds | Duke Energy Florida | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 1 | 0
Estimated Fair Value | 23 | 24
Municipal bonds | Duke Energy Indiana | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 |
Gross Unrealized Holding Losses | 1 | 1
Estimated Fair Value | 25 | 43
U.S. government bonds | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 17 | 3
Gross Unrealized Holding Losses | 51 | 84
Estimated Fair Value | 1,897 | 1,806
U.S. government bonds | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 5 | 5
Estimated Fair Value | 51 | 59
U.S. government bonds | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 9 | 0
Gross Unrealized Holding Losses | 33 | 50
Estimated Fair Value | 1,056 | 991
U.S. government bonds | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 8 | 3
Gross Unrealized Holding Losses | 18 | 34
Estimated Fair Value | 841 | 815
U.S. government bonds | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 8 | 3
Gross Unrealized Holding Losses | 13 | 26
Estimated Fair Value | 694 | 645
U.S. government bonds | Duke Energy Florida | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 5 | 8
Estimated Fair Value | 147 | 170
U.S. government bonds | Duke Energy Indiana | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 |
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 0 | 7
Other debt securities | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 2 | 1
Gross Unrealized Holding Losses | 6 | 8
Estimated Fair Value | 253 | 239
Other debt securities | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 3 | 4
Estimated Fair Value | 43 | 45
Other debt securities | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 2 | 1
Gross Unrealized Holding Losses | 6 | 8
Estimated Fair Value | 241 | 223
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 | 12 | 16
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 | 11 | 14
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 | $ 1 | $ 2

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