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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, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale |  |
Estimated Fair Value | $ 2,815 |
Total Investments |  |
Unrealized Holding Gains | 3,682 | $ 5,033
Unrealized Holding Losses | 395 | 66
Estimated Fair Value | 9,051 | 10,893
NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 3,658 | 4,905
Gross Unrealized Holding Losses | 105 | 43
Estimated Fair Value | 5,871 | 7,350
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 2,550 | 2,891
Total Investments |  |
Unrealized Holding Gains | 3,661 | 4,992
Unrealized Holding Losses | 359 | 63
Estimated Fair Value | 8,636 | 10,401
NDTF | Cash and cash equivalents |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 215 | 160
NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 39
Gross Unrealized Holding Losses | 85 | 6
Estimated Fair Value | 641 | 829
NDTF | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 14
Gross Unrealized Holding Losses | 39 | 1
Estimated Fair Value | 330 | 314
NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 2 | 31
Gross Unrealized Holding Losses | 112 | 12
Estimated Fair Value | 1,423 | 1,568
NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 3
Gross Unrealized Holding Losses | 18 | 1
Estimated Fair Value | 156 | 180
Other Investments |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 21 | 36
Gross Unrealized Holding Losses | 16 |
Estimated Fair Value | 128 | 156
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 265 | 300
Total Investments |  |
Unrealized Holding Gains | 21 | 41
Unrealized Holding Losses | 36 | 3
Estimated Fair Value | 415 | 492
Other Investments | Cash and cash equivalents |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 22 | 36
Other Investments | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 2
Gross Unrealized Holding Losses | 12 | 1
Estimated Fair Value | 84 | 119
Other Investments | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 3
Gross Unrealized Holding Losses | 3 | 1
Estimated Fair Value | 78 | 80
Other Investments | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 2 |
Estimated Fair Value | 62 | 56
Other Investments | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 3 | 1
Estimated Fair Value | 41 | 45
Duke Energy Carolinas |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,298 |
Duke Energy Carolinas | NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2,147 | 2,887
Gross Unrealized Holding Losses | 51 | 19
Estimated Fair Value | 3,367 | 4,265
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,298 | 1,441
Total Investments |  |
Unrealized Holding Gains | 2,149 | 2,932
Unrealized Holding Losses | 192 | 27
Estimated Fair Value | 4,782 | 5,759
Duke Energy Carolinas | NDTF | Cash and cash equivalents |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 117 | 53
Duke Energy Carolinas | NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 24
Gross Unrealized Holding Losses | 62 | 4
Estimated Fair Value | 401 | 506
Duke Energy Carolinas | NDTF | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 2
Gross Unrealized Holding Losses | 10 |
Estimated Fair Value | 64 | 48
Duke Energy Carolinas | NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 16
Gross Unrealized Holding Losses | 51 | 3
Estimated Fair Value | 685 | 712
Duke Energy Carolinas | NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 0 | 3
Gross Unrealized Holding Losses | 18 | 1
Estimated Fair Value | 148 | 175
Progress Energy |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,277 |
Total Investments |  |
Unrealized Holding Gains | 1,512 | 2,062
Unrealized Holding Losses | 167 | 36
Estimated Fair Value | 3,890 | 4,688
Progress Energy | NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 1,511 | 2,018
Gross Unrealized Holding Losses | 54 | 24
Estimated Fair Value | 2,504 | 3,085
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,252 | 1,450
Total Investments |  |
Unrealized Holding Gains | 1,512 | 2,060
Unrealized Holding Losses | 167 | 36
Estimated Fair Value | 3,854 | 4,642
Progress Energy | NDTF | Cash and cash equivalents |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 98 | 107
Progress Energy | NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 15
Gross Unrealized Holding Losses | 23 | 2
Estimated Fair Value | 240 | 323
Progress Energy | NDTF | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 12
Gross Unrealized Holding Losses | 29 | 1
Estimated Fair Value | 266 | 266
Progress Energy | NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 15
Gross Unrealized Holding Losses | 61 | 9
Estimated Fair Value | 738 | 856
Progress Energy | NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 8 | 5
Progress Energy | Other Investments |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 25 | 26
Total Investments |  |
Unrealized Holding Gains |  | 2
Estimated Fair Value | 36 | 46
Progress Energy | Other Investments | Cash and cash equivalents |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 11 | 20
Progress Energy | Other Investments | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 2
Estimated Fair Value | 25 | 26
Duke Energy Progress |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 963 |
Total Investments |  |
Unrealized Holding Gains | 1,432 | 1,957
Unrealized Holding Losses | 142 | 29
Estimated Fair Value | 3,439 | 4,105
Duke Energy Progress | NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 1,431 | 1,915
Gross Unrealized Holding Losses | 54 | 23
Estimated Fair Value | 2,411 | 2,970
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 963 | 1,025
Total Investments |  |
Unrealized Holding Gains | 1,432 | 1,957
Unrealized Holding Losses | 142 | 29
Estimated Fair Value | 3,430 | 4,089
Duke Energy Progress | NDTF | Cash and cash equivalents |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 56 | 94
Duke Energy Progress | NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 15
Gross Unrealized Holding Losses | 22 | 2
Estimated Fair Value | 230 | 282
Duke Energy Progress | NDTF | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 12
Gross Unrealized Holding Losses | 29 | 1
Estimated Fair Value | 266 | 266
Duke Energy Progress | NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 15
Gross Unrealized Holding Losses | 37 | 3
Estimated Fair Value | 460 | 472
Duke Energy Progress | NDTF | Other debt securities |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 7 | 5
Duke Energy Progress | Other Investments |  |
Total Investments |  |
Estimated Fair Value | 9 | 16
Duke Energy Progress | Other Investments | Cash and cash equivalents |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 9 | 16
Duke Energy Florida |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 314 |
Total Investments |  |
Unrealized Holding Gains | 80 | 105
Unrealized Holding Losses | 25 | 7
Estimated Fair Value | 450 | 582
Duke Energy Florida | NDTF |  |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 80 | 103
Gross Unrealized Holding Losses |  | 1
Estimated Fair Value | 93 | 115
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 289 | 425
Total Investments |  |
Unrealized Holding Gains | 80 | 103
Unrealized Holding Losses | 25 | 7
Estimated Fair Value | 424 | 553
Duke Energy Florida | NDTF | Cash and cash equivalents |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 42 | 13
Duke Energy Florida | NDTF | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 1 |
Estimated Fair Value | 10 | 41
Duke Energy Florida | NDTF | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 24 | 6
Estimated Fair Value | 278 | 384
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 | 25 | 26
Total Investments |  |
Unrealized Holding Gains |  | 2
Estimated Fair Value | 26 | 29
Duke Energy Florida | Other Investments | Cash and cash equivalents |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 1 | 3
Duke Energy Florida | Other Investments | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 2
Estimated Fair Value | 25 | 26
Duke Energy Indiana |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 60 |
Total Investments |  |
Unrealized Holding Gains | 2 | 7
Unrealized Holding Losses | 20 | 1
Estimated Fair Value | 140 | 161
Duke Energy Indiana | Other Investments |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 1 |
Equity Securities, FV-NI |  |
Gross Unrealized Holding Gains | 2 | 6
Gross Unrealized Holding Losses | 16 |
Estimated Fair Value | 79 | 97
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 60 | 64
Duke Energy Indiana | Other Investments | Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 1 |
Estimated Fair Value | 8 | 6
Duke Energy Indiana | Other Investments | Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 1
Gross Unrealized Holding Losses | 3 | 1
Estimated Fair Value | 45 | 46
Duke Energy Indiana | Other Investments | U.S. government bonds |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | $ 7 | $ 12

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