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v3.25.2

Employee Benefit Plans (Details) - Qualified Pension Plans - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | $ 27 | $ 29 | $ 54 | $ 57
Interest cost on projected benefit obligation | 82 | 83 | 164 | 165
Expected return on plan assets | (149) | (154) | (298) | (308)
Amortization of actuarial loss | 15 | 8 | 30 | 16
Amortization of prior service credit | (3) | (4) | (6) | (7)
Amortization of settlement charges | 7 | 4 | 13 | 9
Net periodic pension costs | (21) | (34) | (43) | (68)
Duke Energy Carolinas |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 9 | 10 | 18 | 19
Interest cost on projected benefit obligation | 20 | 20 | 39 | 40
Expected return on plan assets | (38) | (40) | (76) | (81)
Amortization of actuarial loss | 3 | 2 | 7 | 4
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 3 | 2 | 6 | 4
Net periodic pension costs | (3) | (6) | (6) | (14)
Progress Energy |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 8 | 8 | 15 | 16
Interest cost on projected benefit obligation | 26 | 26 | 52 | 52
Expected return on plan assets | (55) | (54) | (110) | (108)
Amortization of actuarial loss | 4 | 3 | 9 | 5
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 2 | 1 | 4 | 2
Net periodic pension costs | (15) | (16) | (30) | (33)
Duke Energy Progress |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 4 | 5 | 9 | 10
Interest cost on projected benefit obligation | 12 | 12 | 23 | 24
Expected return on plan assets | (25) | (25) | (49) | (50)
Amortization of actuarial loss | 2 | 2 | 4 | 3
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 2 | 1 | 3 | 2
Net periodic pension costs | (5) | (5) | (10) | (11)
Duke Energy Florida |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 3 | 4 | 6 | 7
Interest cost on projected benefit obligation | 15 | 14 | 29 | 28
Expected return on plan assets | (30) | (29) | (60) | (58)
Amortization of actuarial loss | 2 | 1 | 4 | 2
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 0 | 1 | 1 | 1
Net periodic pension costs | (10) | (9) | (20) | (20)
Duke Energy Ohio |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 0 | 1 | 1
Interest cost on projected benefit obligation | 4 | 4 | 8 | 8
Expected return on plan assets | (6) | (7) | (11) | (13)
Amortization of actuarial loss | 0 | 1 | 1 | 1
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 0 | 0 | 0 | 0
Net periodic pension costs | (1) | (2) | (1) | (3)
Duke Energy Indiana |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 2 | 1 | 3 | 3
Interest cost on projected benefit obligation | 6 | 7 | 13 | 13
Expected return on plan assets | (10) | (11) | (20) | (21)
Amortization of actuarial loss | 1 | 1 | 2 | 2
Amortization of prior service credit | (1) | (1) | (1) | (1)
Amortization of settlement charges | 1 | 1 | 1 | 1
Net periodic pension costs | (1) | (2) | (2) | (3)
Piedmont |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 1 | 2 | 2
Interest cost on projected benefit obligation | 2 | 3 | 5 | 5
Expected return on plan assets | (5) | (5) | (10) | (10)
Amortization of actuarial loss | 1 | 0 | 2 | 1
Amortization of prior service credit | (1) | (2) | (3) | (4)
Amortization of settlement charges | 1 | 1 | 2 | 2
Net periodic pension costs | $ (1) | $ (2) | $ (2) | $ (4)

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