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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, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale |  |
Estimated Fair Value | $ 2,858 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 4,515 | $ 3,682
Unrealized Holding Losses | 259 | 395
Estimated Fair Value | 10,071 | 9,051
NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 142 | 215
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 4,483 | 3,658
Gross Unrealized Holding Losses | 34 | 105
Estimated Fair Value | 6,836 | 5,871
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 2,593 | 2,550
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 4,486 | 3,661
Unrealized Holding Losses | 237 | 359
Estimated Fair Value | 9,571 | 8,636
Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 89 | 22
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 29 | 21
Gross Unrealized Holding Losses | 6 | 16
Estimated Fair Value | 146 | 128
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 265 | 265
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 29 | 21
Unrealized Holding Losses | 22 | 36
Estimated Fair Value | 500 | 415
Duke Energy Carolinas |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,334 |
Duke Energy Carolinas | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 53 | 117
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2,630 | 2,147
Gross Unrealized Holding Losses | 19 | 51
Estimated Fair Value | 3,945 | 3,367
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,334 | 1,298
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 2,631 | 2,149
Unrealized Holding Losses | 135 | 192
Estimated Fair Value | 5,332 | 4,782
Progress Energy |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,284 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 1,855 | 1,512
Unrealized Holding Losses | 102 | 167
Estimated Fair Value | 4,272 | 3,890
Progress Energy | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 89 | 98
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 1,853 | 1,511
Gross Unrealized Holding Losses | 15 | 54
Estimated Fair Value | 2,891 | 2,504
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,259 | 1,252
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 1,855 | 1,512
Unrealized Holding Losses | 102 | 167
Estimated Fair Value | 4,239 | 3,854
Progress Energy | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 8 | 11
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 25 | 25
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Estimated Fair Value | 33 | 36
Duke Energy Progress |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 968 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 1,760 | 1,432
Unrealized Holding Losses | 81 | 142
Estimated Fair Value | 3,833 | 3,439
Duke Energy Progress | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 77 | 56
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 1,758 | 1,431
Gross Unrealized Holding Losses | 15 | 54
Estimated Fair Value | 2,783 | 2,411
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 968 | 963
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 1,760 | 1,432
Unrealized Holding Losses | 81 | 142
Estimated Fair Value | 3,828 | 3,430
Duke Energy Progress | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 5 | 9
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Estimated Fair Value | 5 | 9
Duke Energy Florida |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 316 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 95 | 80
Unrealized Holding Losses | 21 | 25
Estimated Fair Value | 438 | 450
Duke Energy Florida | NDTF |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 12 | 42
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 95 | 80
Estimated Fair Value | 108 | 93
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 291 | 289
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 95 | 80
Unrealized Holding Losses | 21 | 25
Estimated Fair Value | 411 | 424
Duke Energy Florida | Other Investments |  |
Cash and Cash Equivalents |  |
Estimated Fair Value | 2 | 1
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 25 | 25
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Estimated Fair Value | 27 | 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 |  | 1
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 4 | 2
Gross Unrealized Holding Losses | 6 | 16
Estimated Fair Value | 91 | 79
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 62 | 60
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 4 | 2
Unrealized Holding Losses | 8 | 20
Estimated Fair Value | 153 | 140
Corporate debt securities | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 2 | 1
Gross Unrealized Holding Losses | 67 | 85
Estimated Fair Value | 619 | 641
Corporate debt securities | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 10 | 12
Estimated Fair Value | 84 | 84
Corporate debt securities | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 1
Gross Unrealized Holding Losses | 49 | 62
Estimated Fair Value | 393 | 401
Corporate debt securities | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 18 | 23
Estimated Fair Value | 226 | 240
Corporate debt securities | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 17 | 22
Estimated Fair Value | 216 | 230
Corporate debt securities | Duke Energy Florida | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 1 | 1
Estimated Fair Value | 10 | 10
Corporate debt securities | Duke Energy Indiana | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses |  | 1
Estimated Fair Value | 9 | 8
Municipal bonds | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 27 | 39
Estimated Fair Value | 324 | 330
Municipal bonds | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 2 | 3
Estimated Fair Value | 80 | 78
Municipal bonds | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 5 | 10
Estimated Fair Value | 52 | 64
Municipal bonds | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 22 | 29
Estimated Fair Value | 272 | 266
Municipal bonds | Progress Energy | Other Investments |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 25 | 25
Municipal bonds | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 22 | 29
Estimated Fair Value | 272 | 266
Municipal bonds | Duke Energy Florida | Other Investments |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 25 | 25
Municipal bonds | Duke Energy Indiana | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 2 | 3
Estimated Fair Value | 47 | 45
U.S. government bonds | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 2
Gross Unrealized Holding Losses | 92 | 112
Estimated Fair Value | 1,495 | 1,423
U.S. government bonds | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 1 | 2
Estimated Fair Value | 48 | 62
U.S. government bonds | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 1
Gross Unrealized Holding Losses | 45 | 51
Estimated Fair Value | 738 | 685
U.S. government bonds | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 1
Gross Unrealized Holding Losses | 47 | 61
Estimated Fair Value | 757 | 738
U.S. government bonds | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 1
Gross Unrealized Holding Losses | 27 | 37
Estimated Fair Value | 476 | 460
U.S. government bonds | Duke Energy Florida | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 20 | 24
Estimated Fair Value | 281 | 278
U.S. government bonds | Duke Energy Indiana | Other Investments |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 6 | 7
Other debt securities | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 17 | 18
Estimated Fair Value | 155 | 156
Other debt securities | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 3 | 3
Estimated Fair Value | 53 | 41
Other debt securities | Duke Energy Carolinas | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 17 | 18
Estimated Fair Value | 151 | 148
Other debt securities | Progress Energy | NDTF |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 4 | 8
Other debt securities | Duke Energy Progress | NDTF |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | $ 4 | 7
Other debt securities | Duke Energy Florida | NDTF |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value |  | $ 1

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