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v3.25.3

Employee Benefit Plans - Net Periodic Pension Costs (Details) - Qualified Pension Plans - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | $ 26 | $ 28 | $ 80 | $ 85
Interest cost on projected benefit obligation | 83 | 82 | 247 | 247
Expected return on plan assets | (149) | (154) | (447) | (462)
Amortization of actuarial loss | 16 | 9 | 46 | 25
Amortization of prior service credit | (4) | (3) | (10) | (10)
Amortization of settlement charges | 6 | 17 | 19 | 26
Net periodic pension costs | (22) | (21) | (65) | (89)
Duke Energy Carolinas |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 9 | 9 | 27 | 28
Interest cost on projected benefit obligation | 20 | 19 | 59 | 59
Expected return on plan assets | (38) | (41) | (114) | (122)
Amortization of actuarial loss | 3 | 2 | 10 | 6
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 3 | 5 | 9 | 9
Net periodic pension costs | (3) | (6) | (9) | (20)
Progress Energy |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 8 | 8 | 23 | 24
Interest cost on projected benefit obligation | 25 | 26 | 77 | 78
Expected return on plan assets | (55) | (55) | (165) | (163)
Amortization of actuarial loss | 5 | 2 | 14 | 7
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 1 | 7 | 5 | 9
Net periodic pension costs | (16) | (12) | (46) | (45)
Duke Energy Progress |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 5 | 5 | 14 | 15
Interest cost on projected benefit obligation | 11 | 12 | 34 | 36
Expected return on plan assets | (24) | (25) | (73) | (75)
Amortization of actuarial loss | 2 | 1 | 6 | 4
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 1 | 6 | 4 | 8
Net periodic pension costs | (5) | (1) | (15) | (12)
Duke Energy Florida |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 3 | 3 | 9 | 10
Interest cost on projected benefit obligation | 14 | 14 | 43 | 42
Expected return on plan assets | (30) | (29) | (90) | (87)
Amortization of actuarial loss | 2 | 1 | 6 | 3
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 1 | 0 | 2 | 1
Net periodic pension costs | (10) | (11) | (30) | (31)
Duke Energy Ohio |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 1 | 2 | 2
Interest cost on projected benefit obligation | 4 | 5 | 12 | 13
Expected return on plan assets | (6) | (6) | (17) | (19)
Amortization of actuarial loss | 1 | 0 | 2 | 1
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 0 | 2 | 0 | 2
Net periodic pension costs | 0 | 2 | (1) | (1)
Duke Energy Indiana |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 1 | 4 | 4
Interest cost on projected benefit obligation | 6 | 6 | 19 | 19
Expected return on plan assets | (10) | (10) | (30) | (31)
Amortization of actuarial loss | 2 | 1 | 4 | 3
Amortization of prior service credit | 0 | 0 | (1) | (1)
Amortization of settlement charges | 0 | 0 | 1 | 1
Net periodic pension costs | (1) | (2) | (3) | (5)
Piedmont |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 1 | 3 | 3
Interest cost on projected benefit obligation | 3 | 2 | 8 | 7
Expected return on plan assets | (5) | (5) | (15) | (15)
Amortization of actuarial loss | 1 | 1 | 3 | 2
Amortization of prior service credit | (2) | (1) | (5) | (5)
Amortization of settlement charges | 1 | 2 | 3 | 4
Net periodic pension costs | $ (1) | $ 0 | $ (3) | $ (4)

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