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Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Pension Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | $ 100 | $ 107 |
Interest cost on projected benefit obligation | 329 | 325 |
Amortization of regulatory asset | 2 | 2 | $ 3
Pension Plan | Duke Energy Carolinas |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 34 | 36 |
Interest cost on projected benefit obligation | 79 | 78 | 84
Expected return on plan assets | (153) | (161) | (160)
Amortization of actuarial loss | 15 | 8 | 2
Amortization of prior service credit | (1) | (1) | (1)
Amortization of settlement charges | 12 | 12 | 9
Net periodic pension costs | (12) | (27) | (28)
Service cost | 36 | 37 | 38
Pension Plan | Progress Energy |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 28 | 30 |
Interest cost on projected benefit obligation | 103 | 103 | 107
Expected return on plan assets | (220) | (217) | (198)
Amortization of actuarial loss | 19 | 10 | 4
Amortization of settlement charges | 7 | 10 | 5
Net periodic pension costs | (61) | (62) | (49)
Service cost | 30 | 32 | 33
Pension Plan | Duke Energy Progress |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 17 | 18 |
Interest cost on projected benefit obligation | 46 | 47 | 49
Expected return on plan assets | (98) | (99) | (93)
Amortization of actuarial loss | 10 | 6 | 2
Amortization of settlement charges | 5 | 9 | 3
Net periodic pension costs | (19) | (18) | (20)
Service cost | 18 | 19 | 19
Pension Plan | Duke Energy Florida |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 11 | 12 |
Interest cost on projected benefit obligation | 57 | 56 | 57
Expected return on plan assets | (120) | (116) | (104)
Amortization of actuarial loss | 9 | 5 | 2
Amortization of settlement charges | 2 | 2 | 1
Net periodic pension costs | (40) | (40) | (31)
Service cost | 12 | 13 | 13
Pension Plan | Duke Energy Ohio |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 2 | 3 |
Interest cost on projected benefit obligation | 17 | 17 | 18
Expected return on plan assets | (24) | (25) | (24)
Amortization of actuarial loss | 2 | 1 |
Amortization of settlement charges |  | 2 |
Net periodic pension costs | (2) | (2) | (3)
Amortization of regulatory asset | 1 | 1 | 1
Service cost | 3 | 3 | 3
Pension Plan | Duke Energy Indiana |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 5 | 6 |
Interest cost on projected benefit obligation | 26 | 26 | 27
Expected return on plan assets | (40) | (42) | (40)
Amortization of actuarial loss | 5 | 4 | 2
Amortization of prior service credit | (2) | (2) | (2)
Amortization of settlement charges | 2 | 2 | 1
Net periodic pension costs | (3) | (6) | (6)
Service cost | 6 | 6 | 6
Pension Plan | Piedmont |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 3 | 4 |
Interest cost on projected benefit obligation | 10 | 9 | 9
Expected return on plan assets | (20) | (20) | (20)
Amortization of actuarial loss | 4 | 3 |
Amortization of prior service credit | (7) | (7) | (7)
Amortization of settlement charges | 4 | 5 | 4
Net periodic pension costs | (5) | (6) | (10)
Service cost | 4 | 4 | 4
Pension Plan | Parent |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost on projected benefit obligation | 329 | 325 | 344
Expected return on plan assets | (597) | (613) | (588)
Amortization of actuarial loss | 61 | 36 | 10
Amortization of prior service credit | (13) | (13) | (14)
Amortization of settlement charges | 25 | 32 | 19
Net periodic pension costs | (88) | (119) | (112)
Service cost | 107 | 114 | 117
Other Post-Retirement Benefit Plans |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 2 | 2 | 2
Interest cost on projected benefit obligation | 18 | 17 | 22
Expected return on plan assets | (12) | (11) | (11)
Amortization of actuarial loss | (3) | (6) | (6)
Amortization of prior service credit | (21) | (21) | (23)
Net periodic pension costs | (16) | (19) | (16)
Amortization of regulatory asset | 3 | 4 | 4
Regulatory adjustment of net periodic post-retirement benefit costs | 5 |  |
Other Post-Retirement Benefit Plans | Duke Energy Carolinas |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  |  | 1
Interest cost on projected benefit obligation | 3 | 3 | 5
Expected return on plan assets | (8) | (8) | (7)
Amortization of actuarial loss | (1) | (2) | (3)
Amortization of prior service credit | (4) | (4) | (5)
Net periodic pension costs | (10) | (11) | (9)
Other Post-Retirement Benefit Plans | Progress Energy |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost on projected benefit obligation | 8 | 7 | 9
Amortization of actuarial loss | 5 | 8 | 8
Amortization of prior service credit | (11) | (11) | (11)
Net periodic pension costs | 2 | 4 | 6
Other Post-Retirement Benefit Plans | Duke Energy Progress |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost on projected benefit obligation | 5 | 4 | 5
Amortization of actuarial loss | 4 | 6 | 5
Amortization of prior service credit | (6) | (6) | (6)
Net periodic pension costs | 3 | 4 | 4
Other Post-Retirement Benefit Plans | Duke Energy Florida |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost on projected benefit obligation | 3 | 3 | 4
Amortization of actuarial loss | 2 | 2 | 2
Amortization of prior service credit | (5) | (5) | (5)
Net periodic pension costs |  |  | 1
Other Post-Retirement Benefit Plans | Duke Energy Ohio |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost on projected benefit obligation | 1 | 1 | 1
Amortization of actuarial loss | (1) | (2) | (2)
Net periodic pension costs |  | (1) | (1)
Amortization of regulatory asset | 1 | 1 | 1
Other Post-Retirement Benefit Plans | Duke Energy Indiana |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost on projected benefit obligation | 1 | 1 | 1
Amortization of actuarial loss | (1) | (4) | (3)
Amortization of prior service credit | (5) | (5) | (5)
Net periodic pension costs | (5) | (8) | (7)
Regulatory adjustment of net periodic post-retirement benefit costs | 5 |  |
Other Post-Retirement Benefit Plans | Piedmont |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost on projected benefit obligation | 1 | 1 | 1
Expected return on plan assets | (2) | (2) | (2)
Net periodic pension costs | $ (1) | $ (1) | $ (1)

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