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Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | $ 29 | $ 29 | $ 57 | $ 59
Interest cost on projected benefit obligation | 83 | 86 | 165 | 172
Expected return on plan assets | (154) | (147) | (308) | (294)
Amortization of actuarial loss | 8 | 3 | 16 | 5
Amortization of prior service credit | (4) | (4) | (7) | (7)
Amortization of settlement charges | 4 | 4 | 9 | 9
Net periodic pension costs | (34) | (29) | (68) | (56)
Duke Energy Carolinas |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 10 | 9 | 19 | 19
Interest cost on projected benefit obligation | 20 | 21 | 40 | 42
Expected return on plan assets | (40) | (40) | (81) | (80)
Amortization of actuarial loss | 2 | 1 | 4 | 1
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 2 | 2 | 4 | 4
Net periodic pension costs | (6) | (7) | (14) | (14)
Progress Energy |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 8 | 7 | 16 | 16
Interest cost on projected benefit obligation | 26 | 27 | 52 | 54
Expected return on plan assets | (54) | (49) | (108) | (99)
Amortization of actuarial loss | 3 | 1 | 5 | 2
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 1 | 1 | 2 | 2
Net periodic pension costs | (16) | (13) | (33) | (25)
Duke Energy Progress |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 5 | 5 | 10 | 10
Interest cost on projected benefit obligation | 12 | 13 | 24 | 25
Expected return on plan assets | (25) | (23) | (50) | (46)
Amortization of actuarial loss | 2 | 1 | 3 | 1
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 1 | 1 | 2 | 2
Net periodic pension costs | (5) | (3) | (11) | (8)
Duke Energy Florida |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 4 | 4 | 7 | 7
Interest cost on projected benefit obligation | 14 | 15 | 28 | 29
Expected return on plan assets | (29) | (26) | (58) | (52)
Amortization of actuarial loss | 1 | 0 | 2 | 1
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 1 | 1 | 1 | 1
Net periodic pension costs | (9) | (6) | (20) | (14)
Duke Energy Ohio |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 0 | 0 | 1 | 1
Interest cost on projected benefit obligation | 4 | 5 | 8 | 9
Expected return on plan assets | (7) | (6) | (13) | (12)
Amortization of actuarial loss | 1 | 0 | 1 | 0
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of settlement charges | 0 | 0 | 0 | 0
Net periodic pension costs | (2) | (1) | (3) | (2)
Duke Energy Indiana |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 2 | 3 | 3
Interest cost on projected benefit obligation | 7 | 7 | 13 | 14
Expected return on plan assets | (11) | (10) | (21) | (20)
Amortization of actuarial loss | 1 | 0 | 2 | 1
Amortization of prior service credit | (1) | (1) | (1) | (1)
Amortization of settlement charges | 1 | 1 | 1 | 1
Net periodic pension costs | (2) | (1) | (3) | (2)
Piedmont |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 1 | 2 | 2
Interest cost on projected benefit obligation | 3 | 3 | 5 | 5
Expected return on plan assets | (5) | (5) | (10) | (10)
Amortization of actuarial loss | 0 | 0 | 1 | 0
Amortization of prior service credit | (2) | (2) | (4) | (4)
Amortization of settlement charges | 1 | 1 | 2 | 2
Net periodic pension costs | $ (2) | $ (2) | $ (4) | $ (5)

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