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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, 2025 | Mar. 31, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | $ 27 | $ 28
Interest cost on projected benefit obligation | 82 | 82
Expected return on plan assets | (149) | (154)
Amortization of actuarial loss | 15 | 8
Amortization of prior service credit | (3) | (3)
Amortization of settlement charges | 6 | 5
Net periodic pension costs | (22) | (34)
Duke Energy Carolinas |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 9 | 9
Interest cost on projected benefit obligation | 19 | 20
Expected return on plan assets | (38) | (41)
Amortization of actuarial loss | 4 | 2
Amortization of prior service credit | 0 | 0
Amortization of settlement charges | 3 | 2
Net periodic pension costs | (3) | (8)
Progress Energy |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 7 | 8
Interest cost on projected benefit obligation | 26 | 26
Expected return on plan assets | (55) | (54)
Amortization of actuarial loss | 5 | 2
Amortization of prior service credit | 0 | 0
Amortization of settlement charges | 2 | 1
Net periodic pension costs | (15) | (17)
Duke Energy Progress |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 5 | 5
Interest cost on projected benefit obligation | 11 | 12
Expected return on plan assets | (24) | (25)
Amortization of actuarial loss | 2 | 1
Amortization of prior service credit | 0 | 0
Amortization of settlement charges | 1 | 1
Net periodic pension costs | (5) | (6)
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 | (30) | (29)
Amortization of actuarial loss | 2 | 1
Amortization of prior service credit | 0 | 0
Amortization of settlement charges | 1 | 0
Net periodic pension costs | (10) | (11)
Duke Energy Ohio |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 0 | 1
Interest cost on projected benefit obligation | 4 | 4
Expected return on plan assets | (5) | (6)
Amortization of actuarial loss | 1 | 0
Amortization of prior service credit | 0 | 0
Amortization of settlement charges | 0 | 0
Net periodic pension costs | 0 | (1)
Duke Energy Indiana |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 1 | 2
Interest cost on projected benefit obligation | 7 | 6
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 | 3 | 2
Expected return on plan assets | (5) | (5)
Amortization of actuarial loss | 1 | 1
Amortization of prior service credit | (2) | (2)
Amortization of settlement charges | 1 | 1
Net periodic pension costs | $ (1) | $ (2)

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