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v3.23.3

Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | $ 28 | $ 39 | $ 87 | $ 120
Interest cost on projected benefit obligation | 86 | 58 | 258 | 175
Expected return on plan assets | (147) | (140) | (441) | (421)
Amortization of actuarial loss | 2 | 24 | 7 | 71
Amortization of prior service credit | (3) | (5) | (10) | (14)
Amortization of settlement charges | 5 | 14 | 14 | 18
Net periodic pension costs | (29) | (10) | (85) | (51)
Duke Energy Carolinas |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 9 | 12 | 28 | 38
Interest cost on projected benefit obligation | 21 | 14 | 63 | 41
Expected return on plan assets | (40) | (38) | (120) | (114)
Amortization of actuarial loss | 0 | 5 | 1 | 15
Amortization of prior service credit | 0 | (1) | 0 | (3)
Amortization of settlement charges | 3 | 3 | 7 | 6
Net periodic pension costs | (7) | (5) | (21) | (17)
Progress Energy |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 9 | 11 | 25 | 34
Interest cost on projected benefit obligation | 26 | 19 | 80 | 55
Expected return on plan assets | (50) | (46) | (149) | (139)
Amortization of actuarial loss | 1 | 6 | 3 | 19
Amortization of settlement charges | 1 | 5 | 3 | 6
Net periodic pension costs | (13) | (5) | (38) | (25)
Duke Energy Progress |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 5 | 6 | 15 | 20
Interest cost on projected benefit obligation | 12 | 9 | 37 | 25
Expected return on plan assets | (24) | (22) | (70) | (66)
Amortization of actuarial loss | 0 | 3 | 1 | 10
Amortization of settlement charges | 1 | 4 | 3 | 5
Net periodic pension costs | (6) | 0 | (14) | (6)
Duke Energy Florida |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 3 | 4 | 10 | 14
Interest cost on projected benefit obligation | 14 | 10 | 43 | 30
Expected return on plan assets | (26) | (24) | (78) | (72)
Amortization of actuarial loss | 1 | 3 | 2 | 9
Amortization of settlement charges |  | 1 | 1 | 1
Net periodic pension costs | (8) | (6) | (22) | (18)
Duke Energy Ohio |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 1 | 2 | 3
Interest cost on projected benefit obligation | 4 | 3 | 13 | 9
Expected return on plan assets | (6) | (6) | (18) | (17)
Amortization of actuarial loss |  | 2 |  | 4
Amortization of settlement charges |  | 2 |  | 2
Net periodic pension costs | (1) | 2 | (3) | 1
Duke Energy Indiana |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 3 | 4 | 7
Interest cost on projected benefit obligation | 6 | 4 | 20 | 14
Expected return on plan assets | (10) | (9) | (30) | (28)
Amortization of actuarial loss | 1 | 3 | 2 | 8
Amortization of prior service credit |  |  | (1) | (1)
Amortization of settlement charges |  | 1 | 1 | 1
Net periodic pension costs | (2) | 2 | (4) | 1
Piedmont |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 1 | 3 | 4
Interest cost on projected benefit obligation | 2 | 2 | 7 | 6
Expected return on plan assets | (5) | (6) | (15) | (18)
Amortization of actuarial loss |  | 2 |  | 5
Amortization of prior service credit | (1) | (2) | (5) | (6)
Amortization of settlement charges | 1 | 2 | 3 | 2
Net periodic pension costs | $ (2) | $ (1) | $ (7) | $ (7)

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