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Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2024
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 March 31, 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 |  |  | $ | 2 |  |  | $ | 1 |
Interest cost on projected benefit obligation | 82 |  |  | 20 |  |  | 26 |  |  | 12 |  |  | 14 |  |  | 4 |  |  | 6 |  |  | 2 |
Expected return on plan assets | (154) |  |  | (41) |  |  | (54) |  |  | (25) |  |  | (29) |  |  | (6) |  |  | (10) |  |  | (5) |
Amortization of actuarial loss | 8 |  |  | 2 |  |  | 2 |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |  |  | 1 |
Amortization of prior service credit | (3) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (2) |
Amortization of settlement charges | 5 |  |  | 2 |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Net periodic pension costs | $ | (34) |  |  | $ | (8) |  |  | $ | (17) |  |  | $ | (6) |  |  | $ | (11) |  |  | $ | (1) |  |  | $ | (1) |  |  | $ | (2) |
| Three Months Ended March 31, 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 | $ | 30 |  |  | $ | 10 |  |  | $ | 9 |  |  | $ | 5 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost on projected benefit obligation | 86 |  |  | 21 |  |  | 27 |  |  | 12 |  |  | 14 |  |  | 4 |  |  | 7 |  |  | 2 |
Expected return on plan assets | (147) |  |  | (40) |  |  | (50) |  |  | (23) |  |  | (26) |  |  | (6) |  |  | (10) |  |  | (5) |
Amortization of actuarial loss | 2 |  |  | — |  |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | 1 |  |  | — |
Amortization of prior service credit | (3) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (2) |
Amortization of settlement charges | 5 |  |  | 2 |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Net periodic pension costs | $ | (27) |  |  | $ | (7) |  |  | $ | (12) |  |  | $ | (5) |  |  | $ | (8) |  |  | $ | (1) |  |  | $ | (1) |  |  | $ | (3) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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