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Investments in Debt and Equity Securities (Estimated Fair Value of Investments in Debt and Equity Securities) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale |  |
Estimated Fair Value | $ 3,528 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 5,492 | $ 5,804
Unrealized Holding Losses | 209 | 219
Estimated Fair Value | 11,792 | 11,905
NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 128 | 139
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 5,430 | 5,753
Gross Unrealized Holding Losses | 85 | 61
Estimated Fair Value | 7,828 | 8,233
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 3,288 | 3,060
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 5,456 | 5,765
Unrealized Holding Losses | 194 | 200
Estimated Fair Value | 11,244 | 11,432
Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 195 | 47
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 36 | 39
Gross Unrealized Holding Losses | 3 | 4
Estimated Fair Value | 113 | 160
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 240 | 266
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 36 | 39
Unrealized Holding Losses | 15 | 19
Estimated Fair Value | 548 | 473
Duke Energy Carolinas |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,811 |
Duke Energy Carolinas | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 53 | 62
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 3,185 | 3,386
Gross Unrealized Holding Losses | 40 | 33
Estimated Fair Value | 4,512 | 4,751
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,811 | 1,651
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 3,198 | 3,389
Unrealized Holding Losses | 109 | 122
Estimated Fair Value | 6,376 | 6,464
Progress Energy |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,501 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 2,258 | 2,376
Unrealized Holding Losses | 85 | 78
Estimated Fair Value | 4,913 | 5,015
Progress Energy | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 75 | 77
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2,245 | 2,367
Gross Unrealized Holding Losses | 45 | 28
Estimated Fair Value | 3,316 | 3,482
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,477 | 1,409
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 2,258 | 2,376
Unrealized Holding Losses | 85 | 78
Estimated Fair Value | 4,868 | 4,968
Progress Energy | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 21 | 23
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 24 | 24
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 0 | 0
Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 45 | 47
Duke Energy Progress |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,300 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 2,152 | 2,265
Unrealized Holding Losses | 79 | 70
Estimated Fair Value | 4,577 | 4,653
Duke Energy Progress | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 62 | 54
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2,139 | 2,256
Gross Unrealized Holding Losses | 45 | 28
Estimated Fair Value | 3,201 | 3,362
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,300 | 1,221
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 2,152 | 2,265
Unrealized Holding Losses | 79 | 70
Estimated Fair Value | 4,563 | 4,637
Duke Energy Progress | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 14 | 16
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 0 | 0
Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 14 | 16
Duke Energy Florida |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 201 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 106 | 111
Unrealized Holding Losses | 6 | 8
Estimated Fair Value | 332 | 358
Duke Energy Florida | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 13 | 23
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 106 | 111
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 115 | 120
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 177 | 188
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 106 | 111
Unrealized Holding Losses | 6 | 8
Estimated Fair Value | 305 | 331
Duke Energy Florida | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 3 | 3
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 24 | 24
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 0 | 0
Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 27 | 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 | 0 | 0
Gross Unrealized Holding Losses | 3 | 4
Estimated Fair Value | 43 | 89
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 26 | 56
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 0 | 0
Unrealized Holding Losses | 4 | 5
Estimated Fair Value | 71 | 146
Corporate debt securities | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 8 | 6
Gross Unrealized Holding Losses | 29 | 33
Estimated Fair Value | 793 | 673
Corporate debt securities | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 4 | 5
Estimated Fair Value | 77 | 79
Corporate debt securities | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 3 | 2
Gross Unrealized Holding Losses | 24 | 27
Estimated Fair Value | 494 | 401
Corporate debt securities | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 5 | 4
Gross Unrealized Holding Losses | 5 | 6
Estimated Fair Value | 299 | 272
Corporate debt securities | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 5 | 4
Gross Unrealized Holding Losses | 5 | 6
Estimated Fair Value | 283 | 256
Corporate 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 | 16 | 16
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 | 1 | 6
Municipal bonds | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 2
Gross Unrealized Holding Losses | 18 | 14
Estimated Fair Value | 341 | 342
Municipal bonds | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 1 | 1
Estimated Fair Value | 63 | 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 | 34 | 36
Municipal bonds | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 2
Gross Unrealized Holding Losses | 12 | 10
Estimated Fair Value | 307 | 306
Municipal bonds | Progress Energy | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 24 | 24
Municipal bonds | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 2
Gross Unrealized Holding Losses | 12 | 10
Estimated Fair Value | 307 | 306
Municipal bonds | Duke Energy Florida | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 24 | 24
Municipal bonds | Duke Energy Indiana | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 1 | 1
Estimated Fair Value | 23 | 43
U.S. government bonds | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 15 | 3
Gross Unrealized Holding Losses | 55 | 84
Estimated Fair Value | 1,904 | 1,806
U.S. government bonds | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 4 | 5
Estimated Fair Value | 57 | 59
U.S. government bonds | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 8 | 0
Gross Unrealized Holding Losses | 32 | 50
Estimated Fair Value | 1,049 | 991
U.S. government bonds | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 7 | 3
Gross Unrealized Holding Losses | 23 | 34
Estimated Fair Value | 855 | 815
U.S. government bonds | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 7 | 3
Gross Unrealized Holding Losses | 17 | 26
Estimated Fair Value | 696 | 645
U.S. government bonds | Duke Energy Florida | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 0
Gross Unrealized Holding Losses | 6 | 8
Estimated Fair Value | 159 | 170
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 | 2 | 7
Other debt securities | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 2 | 1
Gross Unrealized Holding Losses | 7 | 8
Estimated Fair Value | 250 | 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 | 7 | 8
Estimated Fair Value | 234 | 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 | 16 | 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 | 14 | 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 | $ 2 | $ 2

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