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v3.25.3

Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Plan Contributions | The following table includes information related to the Duke Energy Registrants' contributions to its qualified defined benefit pension plans. There were no contributions made during the nine months ended September 30, 2025.
| Nine Months Ended September 30, 2024
|  |  | Duke |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Contributions made: |  |  |  |  |  |  |  |  |  |  |  |  |  |
2024 | 100 |  |  | 26 |  |  | 23 |  | 14 |  |  | 9 |  |  | 5 |  |  | 8 |  |  | 3 |
Components of Net Periodic Pension Costs | The following tables include the components of net periodic pension costs for qualified pension plans.
| Three Months Ended September 30, 2025
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Service cost | $ | 26 |  |  | $ | 9 |  |  | $ | 8 |  |  | $ | 5 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost on projected benefit obligation | 83 |  |  | 20 |  |  | 25 |  |  | 11 |  |  | 14 |  |  | 4 |  |  | 6 |  |  | 3 |
Expected return on plan assets | (149) |  |  | (38) |  |  | (55) |  |  | (24) |  |  | (30) |  |  | (6) |  |  | (10) |  |  | (5) |
Amortization of actuarial loss | 16 |  |  | 3 |  |  | 5 |  |  | 2 |  |  | 2 |  |  | 1 |  |  | 2 |  |  | 1 |
Amortization of prior service credit | (4) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (2) |
Amortization of settlement charges | 6 |  |  | 3 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Net periodic pension costs | $ | (22) |  |  | $ | (3) |  |  | $ | (16) |  |  | $ | (5) |  |  | $ | (10) |  |  | $ | — |  |  | $ | (1) |  |  | $ | (1) |
| Three Months Ended September 30, 2024
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Service cost | $ | 28 |  |  | $ | 9 |  |  | $ | 8 |  |  | $ | 5 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost on projected benefit obligation | 82 |  |  | 19 |  |  | 26 |  |  | 12 |  |  | 14 |  |  | 5 |  |  | 6 |  |  | 2 |
Expected return on plan assets | (154) |  |  | (41) |  |  | (55) |  |  | (25) |  |  | (29) |  |  | (6) |  |  | (10) |  |  | (5) |
Amortization of actuarial loss | 9 |  |  | 2 |  |  | 2 |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |  |  | 1 |
Amortization of prior service credit | (3) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1) |
Amortization of settlement charges | 17 |  |  | 5 |  |  | 7 |  |  | 6 |  |  | — |  |  | 2 |  |  | — |  |  | 2 |
Net periodic pension costs | $ | (21) |  |  | $ | (6) |  |  | $ | (12) |  |  | $ | (1) |  |  | $ | (11) |  |  | $ | 2 |  |  | $ | (2) |  |  | $ | — |
| Nine Months Ended September 30, 2025
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Service cost | $ | 80 |  |  | $ | 27 |  |  | $ | 23 |  |  | $ | 14 |  |  | $ | 9 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 3 |
Interest cost on projected benefit obligation | 247 |  |  | 59 |  |  | 77 |  |  | 34 |  |  | 43 |  |  | 12 |  |  | 19 |  |  | 8 |
Expected return on plan assets | (447) |  |  | (114) |  |  | (165) |  |  | (73) |  |  | (90) |  |  | (17) |  |  | (30) |  |  | (15) |
Amortization of actuarial loss | 46 |  |  | 10 |  |  | 14 |  |  | 6 |  |  | 6 |  |  | 2 |  |  | 4 |  |  | 3 |
Amortization of prior service credit | (10) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1) |  |  | (5) |
Amortization of settlement charges | 19 |  |  | 9 |  |  | 5 |  |  | 4 |  |  | 2 |  |  | — |  |  | 1 |  |  | 3 |
Net periodic pension costs | $ | (65) |  |  | $ | (9) |  |  | $ | (46) |  |  | $ | (15) |  |  | $ | (30) |  |  | $ | (1) |  |  | $ | (3) |  |  | $ | (3) |
| Nine Months Ended September 30, 2024
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Service cost | $ | 85 |  |  | $ | 28 |  |  | $ | 24 |  |  | $ | 15 |  |  | $ | 10 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 3 |
Interest cost on projected benefit obligation | 247 |  |  | 59 |  |  | 78 |  |  | 36 |  |  | 42 |  |  | 13 |  |  | 19 |  |  | 7 |
Expected return on plan assets | (462) |  |  | (122) |  |  | (163) |  |  | (75) |  |  | (87) |  |  | (19) |  |  | (31) |  |  | (15) |
Amortization of actuarial loss | 25 |  |  | 6 |  |  | 7 |  |  | 4 |  |  | 3 |  |  | 1 |  |  | 3 |  |  | 2 |
Amortization of prior service credit | (10) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1) |  |  | (5) |
Amortization of settlement charges | 26 |  |  | 9 |  |  | 9 |  |  | 8 |  |  | 1 |  |  | 2 |  |  | 1 |  |  | 4 |
Net periodic pension costs | $ | (89) |  |  | $ | (20) |  |  | $ | (45) |  |  | $ | (12) |  |  | $ | (31) |  |  | $ | (1) |  |  | $ | (5) |  |  | $ | (4) |

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