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v3.23.2

Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | $ 29 | $ 41 | $ 59 | $ 81
Interest cost on projected benefit obligation | 86 | 59 | 172 | 117
Expected return on plan assets | (147) | (141) | (294) | (281)
Amortization of actuarial loss | 3 | 23 | 5 | 47
Amortization of prior service credit | (4) | (4) | (7) | (9)
Amortization of settlement charges | 4 | 2 | 9 | 4
Net periodic pension costs | (29) | (20) | (56) | (41)
Duke Energy Carolinas |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 9 | 14 | 19 | 26
Interest cost on projected benefit obligation | 21 | 13 | 42 | 27
Expected return on plan assets | (40) | (38) | (80) | (76)
Amortization of actuarial loss | 1 | 5 | 1 | 10
Amortization of prior service credit | 0 | (1) | 0 | (2)
Amortization of settlement charges | 2 | 2 | 4 | 3
Net periodic pension costs | (7) | (5) | (14) | (12)
Progress Energy |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 7 | 11 | 16 | 23
Interest cost on projected benefit obligation | 27 | 18 | 54 | 36
Expected return on plan assets | (49) | (47) | (99) | (93)
Amortization of actuarial loss | 1 | 7 | 2 | 13
Amortization of settlement charges | 1 |  | 2 | 1
Net periodic pension costs | (13) | (11) | (25) | (20)
Duke Energy Progress |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 5 | 7 | 10 | 14
Interest cost on projected benefit obligation | 13 | 8 | 25 | 16
Expected return on plan assets | (23) | (22) | (46) | (44)
Amortization of actuarial loss | 1 | 4 | 1 | 7
Amortization of settlement charges | 1 | 1 | 2 | 1
Net periodic pension costs | (3) | (2) | (8) | (6)
Duke Energy Florida |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 4 | 6 | 7 | 10
Interest cost on projected benefit obligation | 15 | 10 | 29 | 20
Expected return on plan assets | (26) | (24) | (52) | (48)
Amortization of actuarial loss | 0 | 3 | 1 | 6
Amortization of settlement charges | 1 |  | 1 |
Net periodic pension costs | (6) | (5) | (14) | (12)
Duke Energy Ohio |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 0 | 1 | 1 | 2
Interest cost on projected benefit obligation | 5 | 3 | 9 | 6
Expected return on plan assets | (6) | (6) | (12) | (11)
Amortization of actuarial loss |  | 1 |  | 2
Net periodic pension costs | (1) | (1) | (2) | (1)
Duke Energy Indiana |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 2 | 2 | 3 | 4
Interest cost on projected benefit obligation | 7 | 5 | 14 | 10
Expected return on plan assets | (10) | (10) | (20) | (19)
Amortization of actuarial loss | 0 | 3 | 1 | 5
Amortization of prior service credit | (1) | (1) | (1) | (1)
Amortization of settlement charges | 1 |  | 1 |
Net periodic pension costs | (1) | (1) | (2) | (1)
Piedmont |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 2 | 2 | 3
Interest cost on projected benefit obligation | 3 | 2 | 5 | 4
Expected return on plan assets | (5) | (6) | (10) | (12)
Amortization of actuarial loss |  | 1 |  | 3
Amortization of prior service credit | (2) | (2) | (4) | (4)
Amortization of settlement charges | 1 |  | 2 |
Net periodic pension costs | $ (2) | $ (3) | $ (5) | $ (6)

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