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Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | $ 28 | $ 30
Interest cost on projected benefit obligation | 82 | 86
Expected return on plan assets | (154) | (147)
Amortization of actuarial loss | 8 | 2
Amortization of prior service credit | (3) | (3)
Amortization of settlement charges | 5 | 5
Net periodic pension costs | (34) | (27)
Duke Energy Carolinas |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 9 | 10
Interest cost on projected benefit obligation | 20 | 21
Expected return on plan assets | (41) | (40)
Amortization of actuarial loss | 2 | 0
Amortization of prior service credit | 0 | 0
Amortization of settlement charges | 2 | 2
Net periodic pension costs | (8) | (7)
Progress Energy |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 8 | 9
Interest cost on projected benefit obligation | 26 | 27
Expected return on plan assets | (54) | (50)
Amortization of actuarial loss | 2 | 1
Amortization of prior service credit | 0 | 0
Amortization of settlement charges | 1 | 1
Net periodic pension costs | (17) | (12)
Duke Energy Progress |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 5 | 5
Interest cost on projected benefit obligation | 12 | 12
Expected return on plan assets | (25) | (23)
Amortization of actuarial loss | 1 | 0
Amortization of prior service credit | 0 | 0
Amortization of settlement charges | 1 | 1
Net periodic pension costs | (6) | (5)
Duke Energy Florida |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 3 | 3
Interest cost on projected benefit obligation | 14 | 14
Expected return on plan assets | (29) | (26)
Amortization of actuarial loss | 1 | 1
Amortization of prior service credit | 0 | 0
Amortization of settlement charges | 0 | 0
Net periodic pension costs | (11) | (8)
Duke Energy Ohio |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 1 | 1
Interest cost on projected benefit obligation | 4 | 4
Expected return on plan assets | (6) | (6)
Amortization of actuarial loss | 0 | 0
Amortization of prior service credit | 0 | 0
Amortization of settlement charges | 0 | 0
Net periodic pension costs | (1) | (1)
Duke Energy Indiana |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 2 | 1
Interest cost on projected benefit obligation | 6 | 7
Expected return on plan assets | (10) | (10)
Amortization of actuarial loss | 1 | 1
Amortization of prior service credit | 0 | 0
Amortization of settlement charges | 0 | 0
Net periodic pension costs | (1) | (1)
Piedmont |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 1 | 1
Interest cost on projected benefit obligation | 2 | 2
Expected return on plan assets | (5) | (5)
Amortization of actuarial loss | 1 | 0
Amortization of prior service credit | (2) | (2)
Amortization of settlement charges | 1 | 1
Net periodic pension costs | $ (2) | $ (3)

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