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Employee Benefit Plans (Tables) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Retirement Benefits [Abstract] |  |
Schedule of Defined Benefit Plans Disclosures | The following table includes information related to the Duke Energy Registrants' contributions to its qualified defined benefit pension plans.
| Nine Months Ended September 30, 2023 and 2022
|  |  | Duke |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Contributions made: |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 | $ | 100 |  |  | $ | 26 |  |  | $ | 22 |  | $ | 13 |  |  | $ | 9 |  |  | $ | 5 |  |  | $ | 8 |  |  | $ | 3 |
2022 | $ | 58 |  |  | $ | 15 |  |  | $ | 13 |  | $ | 8 |  |  | $ | 5 |  |  | $ | 3 |  |  | $ | 5 |  |  | $ | 2 |
Qualified Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
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, 2023
|  |  | 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 |  |  | $ | 9 |  |  | $ | 5 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost on projected benefit obligation | 86 |  |  | 21 |  |  | 26 |  |  | 12 |  |  | 14 |  |  | 4 |  |  | 6 |  |  | 2 |
Expected return on plan assets | (147) |  |  | (40) |  |  | (50) |  |  | (24) |  |  | (26) |  |  | (6) |  |  | (10) |  |  | (5) |
Amortization of actuarial loss | 2 |  |  | — |  |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | 1 |  |  | — |
Amortization of prior service credit | (3) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1) |
Amortization of settlement charges | 5 |  |  | 3 |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Net periodic pension costs | $ | (29) |  |  | $ | (7) |  |  | $ | (13) |  |  | $ | (6) |  |  | $ | (8) |  |  | $ | (1) |  |  | $ | (2) |  |  | $ | (2) |
| Three Months Ended September 30, 2022
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Service cost | $ | 39 |  |  | $ | 12 |  |  | $ | 11 |  |  | $ | 6 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 1 |
Interest cost on projected benefit obligation | 58 |  |  | 14 |  |  | 19 |  |  | 9 |  |  | 10 |  |  | 3 |  |  | 4 |  |  | 2 |
Expected return on plan assets | (140) |  |  | (38) |  |  | (46) |  |  | (22) |  |  | (24) |  |  | (6) |  |  | (9) |  |  | (6) |
Amortization of actuarial loss | 24 |  |  | 5 |  |  | 6 |  |  | 3 |  |  | 3 |  |  | 2 |  |  | 3 |  |  | 2 |
Amortization of prior service credit | (5) |  |  | (1) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (2) |
Amortization of settlement charges | 14 |  |  | 3 |  |  | 5 |  |  | 4 |  |  | 1 |  |  | 2 |  |  | 1 |  |  | 2 |
Net periodic pension costs | $ | (10) |  |  | $ | (5) |  |  | $ | (5) |  |  | $ | — |  |  | $ | (6) |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | (1) |
| Nine Months Ended September 30, 2023
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Service cost | $ | 87 |  |  | $ | 28 |  |  | $ | 25 |  |  | $ | 15 |  |  | $ | 10 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 3 |
Interest cost on projected benefit obligation | 258 |  |  | 63 |  |  | 80 |  |  | 37 |  |  | 43 |  |  | 13 |  |  | 20 |  |  | 7 |
Expected return on plan assets | (441) |  |  | (120) |  |  | (149) |  |  | (70) |  |  | (78) |  |  | (18) |  |  | (30) |  |  | (15) |
Amortization of actuarial loss | 7 |  |  | 1 |  |  | 3 |  |  | 1 |  |  | 2 |  |  | — |  |  | 2 |  |  | — |
Amortization of prior service credit | (10) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1) |  |  | (5) |
Amortization of settlement charges | 14 |  |  | 7 |  |  | 3 |  |  | 3 |  |  | 1 |  |  | — |  |  | 1 |  |  | 3 |
Net periodic pension costs | $ | (85) |  |  | $ | (21) |  |  | $ | (38) |  |  | $ | (14) |  |  | $ | (22) |  |  | $ | (3) |  |  | $ | (4) |  |  | $ | (7) |
| Nine Months Ended September 30, 2022
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Service cost | $ | 120 |  |  | $ | 38 |  |  | $ | 34 |  |  | $ | 20 |  |  | $ | 14 |  |  | $ | 3 |  |  | $ | 7 |  |  | $ | 4 |
Interest cost on projected benefit obligation | 175 |  |  | 41 |  |  | 55 |  |  | 25 |  |  | 30 |  |  | 9 |  |  | 14 |  |  | 6 |
Expected return on plan assets | (421) |  |  | (114) |  |  | (139) |  |  | (66) |  |  | (72) |  |  | (17) |  |  | (28) |  |  | (18) |
Amortization of actuarial loss | 71 |  |  | 15 |  |  | 19 |  |  | 10 |  |  | 9 |  |  | 4 |  |  | 8 |  |  | 5 |
Amortization of prior service credit | (14) |  |  | (3) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1) |  |  | (6) |
Amortization of settlement charges | 18 |  |  | 6 |  |  | 6 |  |  | 5 |  |  | 1 |  |  | 2 |  |  | 1 |  |  | 2 |
Net periodic pension costs | $ | (51) |  |  | $ | (17) |  |  | $ | (25) |  |  | $ | (6) |  |  | $ | (18) |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | (7) |
2023000000 | $ 100 | $ 58
Qualified Pension Plans | Duke Energy Carolinas |  |
Defined Benefit Plan Disclosure [Line Items] |  |
2023000000 | 26 | 15
Qualified Pension Plans | Progress Energy |  |
Defined Benefit Plan Disclosure [Line Items] |  |
2023000000 | 22 | 13
Qualified Pension Plans | Duke Energy Progress |  |
Defined Benefit Plan Disclosure [Line Items] |  |
2023000000 | 13 | 8
Qualified Pension Plans | Duke Energy Florida |  |
Defined Benefit Plan Disclosure [Line Items] |  |
2023000000 | 9 | 5
Qualified Pension Plans | Duke Energy Ohio |  |
Defined Benefit Plan Disclosure [Line Items] |  |
2023000000 | 5 | 3
Qualified Pension Plans | Duke Energy Indiana |  |
Defined Benefit Plan Disclosure [Line Items] |  |
2023000000 | 8 | 5
Qualified Pension Plans | Piedmont |  |
Defined Benefit Plan Disclosure [Line Items] |  |
2023000000 | $ 3 | $ 2

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