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Investments in Debt and Equity Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Investment [Line Items] |
Summary of Investments in Debt and Equity Securities | The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
| December 31, 2023 |  | December 31, 2022
| Gross |  | Gross |  |  |  | Gross |  | Gross |  |
| Unrealized |  | Unrealized |  |  |  | Unrealized |  | Unrealized |  |
| Holding |  | Holding |  | Estimated |  | Holding |  | Holding |  | Estimated
(in millions) | Gains |  | Losses |  | Fair Value |  | Gains |  | Losses |  | Fair Value
NDTF |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 133 |  |  | $ | — |  |  | $ | — |  |  | $ | 215 |
Equity securities | 4,942 |  |  | 22 |  |  | 7,278 |  |  | 3,658 |  |  | 105 |  |  | 5,871 |
Corporate debt securities | 12 |  |  | 43 |  |  | 632 |  |  | 1 |  |  | 85 |  |  | 641 |
Municipal bonds | 6 |  |  | 16 |  |  | 347 |  |  | — |  |  | 39 |  |  | 330 |
U.S. government bonds | 24 |  |  | 65 |  |  | 1,575 |  |  | 2 |  |  | 112 |  |  | 1,423 |
Other debt securities | 1 |  |  | 13 |  |  | 178 |  |  | — |  |  | 18 |  |  | 156 |
Total NDTF Investments | $ | 4,985 |  |  | $ | 159 |  |  | $ | 10,143 |  |  | $ | 3,661 |  |  | $ | 359 |  |  | $ | 8,636 |
Other Investments |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 31 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |
Equity securities | 33 |  |  | — |  |  | 158 |  |  | 21 |  |  | 16 |  |  | 128 |
Corporate debt securities | — |  |  | 6 |  |  | 82 |  |  | — |  |  | 12 |  |  | 84 |
Municipal bonds | 1 |  |  | 2 |  |  | 77 |  |  | — |  |  | 3 |  |  | 78 |
U.S. government bonds | — |  |  | 2 |  |  | 65 |  |  | — |  |  | 2 |  |  | 62 |
Other debt securities | — |  |  | 2 |  |  | 47 |  |  | — |  |  | 3 |  |  | 41 |
Total Other Investments | $ | 34 |  |  | $ | 12 |  |  | $ | 460 |  |  | $ | 21 |  |  | $ | 36 |  |  | $ | 415 |
Total Investments | $ | 5,019 |  |  | $ | 171 |  |  | $ | 10,603 |  |  | $ | 3,682 |  |  | $ | 395 |  |  | $ | 9,051 |
Schedule of Realized Gain (Loss) | Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2023, 2022 and 2021, were as follows.
| Years Ended December 31,
(in millions) | 2023 |  | 2022 |  | 2021
FV-NI: |  |  |  |  |
Realized gains | $ | 129 |  |  | $ | 201 |  |  | $ | 724 |
Realized losses | 146 |  |  | 316 |  |  | 141 |
AFS: |  |  |  |  |
Realized gains | 44 |  |  | 28 |  |  | 56 |
Realized losses | 140 |  |  | 151 |  |  | 54 |
Investments Classified by Contractual Maturity Date | The table below summarizes the maturity date for debt securities.
| December 31, 2023
|  | Duke |  | Duke | Duke | Duke
| Duke | Energy | Progress | Energy | Energy | Energy
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Indiana
Due in one year or less | $ | 116 |  | $ | 9 |  | $ | 89 |  | $ | 13 |  | $ | 76 |  | $ | 7 |
Due after one through five years | 696 |  | 226 |  | 391 |  | 254 |  | 137 |  | 20 |
Due after five through 10 years | 598 |  | 333 |  | 217 |  | 204 |  | 13 |  | 11 |
Due after 10 years | 1,593 |  | 870 |  | 620 |  | 579 |  | 41 |  | 26 |
Total | $ | 3,003 |  | $ | 1,438 |  | $ | 1,317 |  | $ | 1,050 |  | $ | 267 |  | $ | 64 |
Duke Energy Carolinas |
Investment [Line Items] |
Summary of Investments in Debt and Equity Securities | The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
| December 31, 2023 |  | December 31, 2022
| Gross |  | Gross |  |  |  | Gross |  | Gross |  |
| Unrealized |  | Unrealized |  |  |  | Unrealized |  | Unrealized |  |
| Holding |  | Holding |  | Estimated |  | Holding |  | Holding |  | Estimated
(in millions) | Gains |  | Losses |  | Fair Value |  | Gains |  | Losses |  | Fair Value
NDTF |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 51 |  |  | $ | — |  |  | $ | — |  |  | $ | 117 |
Equity securities | 2,886 |  |  | 14 |  |  | 4,196 |  |  | 2,147 |  |  | 51 |  |  | 3,367 |
Corporate debt securities | 4 |  |  | 35 |  |  | 390 |  |  | 1 |  |  | 62 |  |  | 401 |
Municipal bonds | — |  |  | 4 |  |  | 50 |  |  | — |  |  | 10 |  |  | 64 |
U.S. government bonds | 13 |  |  | 33 |  |  | 826 |  |  | 1 |  |  | 51 |  |  | 685 |
Other debt securities | 1 |  |  | 13 |  |  | 172 |  |  | — |  |  | 18 |  |  | 148 |
Total NDTF Investments | $ | 2,904 |  |  | $ | 99 |  |  | $ | 5,685 |  |  | $ | 2,149 |  |  | $ | 192 |  |  | $ | 4,782 |
Schedule of Realized Gain (Loss) | Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2023, 2022 and 2021, were as follows.
| Years Ended December 31,
(in millions) | 2023 |  | 2022 |  | 2021
FV-NI: |  |  |  |  |
Realized gains | $ | 82 |  |  | $ | 124 |  |  | $ | 440 |
Realized losses | 79 |  |  | 177 |  |  | 96 |
AFS: |  |  |  |  |
Realized gains | 22 |  |  | 22 |  |  | 38 |
Realized losses | 65 |  |  | 86 |  |  | 37 |
Progress Energy |
Investment [Line Items] |
Summary of Investments in Debt and Equity Securities | The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
| December 31, 2023 |  | December 31, 2022
| Gross |  | Gross |  |  |  | Gross |  | Gross |  |
| Unrealized |  | Unrealized |  |  |  | Unrealized |  | Unrealized |  |
| Holding |  | Holding |  | Estimated |  | Holding |  | Holding |  | Estimated
(in millions) | Gains |  | Losses |  | Fair Value |  | Gains |  | Losses |  | Fair Value
NDTF |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 82 |  |  | $ | — |  |  | $ | — |  |  | $ | 98 |
Equity securities | 2,056 |  |  | 8 |  |  | 3,082 |  |  | 1,511 |  |  | 54 |  |  | 2,504 |
Corporate debt securities | 8 |  |  | 8 |  |  | 242 |  |  | — |  |  | 23 |  |  | 240 |
Municipal bonds | 6 |  |  | 12 |  |  | 297 |  |  | — |  |  | 29 |  |  | 266 |
U.S. government bonds | 11 |  |  | 32 |  |  | 749 |  |  | 1 |  |  | 61 |  |  | 738 |
Other debt securities | — |  |  | — |  |  | 6 |  |  | — |  |  | — |  |  | 8 |
Total NDTF Investments | $ | 2,081 |  |  | $ | 60 |  |  | $ | 4,458 |  |  | $ | 1,512 |  |  | $ | 167 |  |  | $ | 3,854 |
Other Investments |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 18 |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |
Municipal bonds | — |  |  | 1 |  |  | 23 |  |  | — |  |  | — |  |  | 25 |
Total Other Investments | $ | — |  |  | $ | 1 |  |  | $ | 41 |  |  | $ | — |  |  | $ | — |  |  | $ | 36 |
Total Investments | $ | 2,081 |  |  | $ | 61 |  |  | $ | 4,499 |  |  | $ | 1,512 |  |  | $ | 167 |  |  | $ | 3,890 |
Schedule of Realized Gain (Loss) | Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2023, 2022 and 2021, were as follows.
| Years Ended December 31,
(in millions) | 2023 |  | 2022 |  | 2021
FV-NI: |  |  |  |  |
Realized gains | $ | 47 |  |  | $ | 77 |  |  | $ | 284 |
Realized losses | 67 |  |  | 139 |  |  | 45 |
AFS: |  |  |  |  |
Realized gains | 22 |  |  | 6 |  |  | 16 |
Realized losses | 75 |  |  | 48 |  |  | 14 |
Duke Energy Progress |
Investment [Line Items] |
Summary of Investments in Debt and Equity Securities | The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
| December 31, 2023 |  | December 31, 2022
| Gross |  | Gross |  |  |  | Gross |  | Gross |  |
| Unrealized |  | Unrealized |  |  |  | Unrealized |  | Unrealized |  |
| Holding |  | Holding |  | Estimated |  | Holding |  | Holding |  | Estimated
(in millions) | Gains |  | Losses |  | Fair Value |  | Gains |  | Losses |  | Fair Value
NDTF |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 55 |  |  | $ | — |  |  | $ | — |  |  | $ | 56 |
Equity securities | 1,956 |  |  | 8 |  |  | 2,970 |  |  | 1,431 |  |  | 54 |  |  | 2,411 |
Corporate debt securities | 7 |  |  | 8 |  |  | 229 |  |  | — |  |  | 22 |  |  | 230 |
Municipal bonds | 6 |  |  | 12 |  |  | 297 |  |  | — |  |  | 29 |  |  | 266 |
U.S. government bonds | 10 |  |  | 18 |  |  | 518 |  |  | 1 |  |  | 37 |  |  | 460 |
Other debt securities | — |  |  | — |  |  | 6 |  |  | — |  |  | — |  |  | 7 |
Total NDTF Investments | $ | 1,979 |  |  | $ | 46 |  |  | $ | 4,075 |  |  | $ | 1,432 |  |  | $ | 142 |  |  | $ | 3,430 |
Other Investments |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 14 |  |  | $ | — |  |  | $ | — |  |  | $ | 9 |
Total Other Investments | $ | — |  |  | $ | — |  |  | $ | 14 |  |  | $ | — |  |  | $ | — |  |  | $ | 9 |
Total Investments | $ | 1,979 |  |  | $ | 46 |  |  | $ | 4,089 |  |  | $ | 1,432 |  |  | $ | 142 |  |  | $ | 3,439 |
Schedule of Realized Gain (Loss) | Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2023, 2022 and 2021, were as follows.
| Years Ended December 31,
(in millions) | 2023 |  | 2022 |  | 2021
FV-NI: |  |  |  |  |
Realized gains | $ | 44 |  |  | $ | 76 |  |  | $ | 283 |
Realized losses | 66 |  |  | 136 |  |  | 44 |
AFS: |  |  |  |  |
Realized gains | 20 |  |  | 6 |  |  | 15 |
Realized losses | 70 |  |  | 44 |  |  | 13 |
Duke Energy Florida |
Investment [Line Items] |
Summary of Investments in Debt and Equity Securities | The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
| December 31, 2023 |  | December 31, 2022
| Gross |  | Gross |  |  |  | Gross |  | Gross |  |
| Unrealized |  | Unrealized |  |  |  | Unrealized |  | Unrealized |  |
| Holding |  | Holding |  | Estimated |  | Holding |  | Holding |  | Estimated
(in millions) | Gains |  | Losses |  | Fair Value |  | Gains |  | Losses |  | Fair Value
NDTF |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 27 |  |  | $ | — |  |  | $ | — |  |  | $ | 42 |
Equity securities | 100 |  |  | — |  |  | 112 |  |  | 80 |  |  | — |  |  | 93 |
Corporate debt securities | 1 |  |  | — |  |  | 13 |  |  | — |  |  | 1 |  |  | 10 |
U.S. government bonds | 1 |  |  | 14 |  |  | 231 |  |  | — |  |  | 24 |  |  | 278 |
Other debt securities | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |
Total NDTF Investments(a) | $ | 102 |  |  | $ | 14 |  |  | $ | 383 |  |  | $ | 80 |  |  | $ | 25 |  |  | $ | 424 |
Other Investments |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |
Municipal bonds | — |  |  | 1 |  |  | 23 |  |  |  |  | — |  |  | 25 |
Total Other Investments | $ | — |  |  | $ | 1 |  |  | $ | 26 |  |  | $ | — |  |  | $ | — |  |  | $ | 26 |
Total Investments | $ | 102 |  |  | $ | 15 |  |  | $ | 409 |  |  | $ | 80 |  |  | $ | 25 |  |  | $ | 450 |
(a) During the years ended December 31, 2023, and 2022, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.
Duke Energy Indiana |
Investment [Line Items] |
Summary of Investments in Debt and Equity Securities | The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS.
| December 31, 2023 |  | December 31, 2022
| Gross |  | Gross |  |  |  | Gross |  | Gross |  |
| Unrealized |  | Unrealized |  |  |  | Unrealized |  | Unrealized |  |
| Holding |  | Holding |  | Estimated |  | Holding |  | Holding |  | Estimated
(in millions) | Gains |  | Losses |  | Fair Value |  | Gains |  | Losses |  | Fair Value
Investments |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |
Equity securities | 4 |  |  | — |  |  | 98 |  |  | 2 |  |  | 16 |  |  | 79 |
Corporate debt securities | — |  |  | — |  |  | 8 |  |  | — |  |  | 1 |  |  | 8 |
Municipal bonds | 1 |  |  | 1 |  |  | 46 |  |  | — |  |  | 3 |  |  | 45 |
U.S. government bonds | — |  |  | — |  |  | 10 |  |  | — |  |  | — |  |  | 7 |
Total Investments | $ | 5 |  |  | $ | 1 |  |  | $ | 163 |  |  | $ | 2 |  |  | $ | 20 |  |  | $ | 140 |

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
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