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Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Amortization of regulatory asset | $ 3 | $ 3 | $ 4
Pension Plan | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 152 | 176 |
Service cost | 145 | 168 | 165
Interest cost | 249 | 220 | 269
Expected return on plan assets | (558) | (558) | (572)
Amortization of prior service credit | 81 | 133 | 128
Amortization of prior service cost (credit) | (18) | (29) | (32)
Amortization of settlement charges(c) |  |  | 18
Amortization of settlement charges | 32 | 9 |
MRVA method change | 24 |  |
Net periodic costs | (38) | (49) | (24)
Pension Plan | Duke Energy Carolinas | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 48 | 56 |
Service cost | 47 | 54 | 51
Interest cost | 59 | 51 | 62
Expected return on plan assets | (152) | (141) | (145)
Amortization of prior service credit | 16 | 29 | 28
Amortization of prior service cost (credit) | (3) | (8) | (8)
Amortization of settlement charges(c) |  |  | 9
Amortization of settlement charges | 9 | 5 |
MRVA method change | 0 |  |
Net periodic costs | (23) | (8) | (3)
Pension Plan | Progress Energy | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 43 | 50 |
Service cost | 40 | 48 | 48
Interest cost | 77 | 70 | 85
Expected return on plan assets | (183) | (187) | (190)
Amortization of prior service credit | 23 | 38 | 41
Amortization of prior service cost (credit) |  | (2) | (3)
Amortization of settlement charges(c) |  |  | 7
Amortization of settlement charges | 8 | 2 |
MRVA method change | 24 |  |
Net periodic costs | (8) | (29) | (12)
Pension Plan | Duke Energy Progress | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 25 | 29 |
Service cost | 24 | 28 | 27
Interest cost | 35 | 30 | 38
Expected return on plan assets | (88) | (84) | (87)
Amortization of prior service credit | 12 | 18 | 18
Amortization of prior service cost (credit) |  | (1) | (2)
Amortization of settlement charges(c) |  |  | 6
Amortization of settlement charges | 7 | 2 |
MRVA method change | 0 |  |
Net periodic costs | (9) | (6) |
Pension Plan | Duke Energy Florida | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 17 | 21 |
Service cost | 16 | 20 | 21
Interest cost | 41 | 39 | 46
Expected return on plan assets | (94) | (102) | (101)
Amortization of prior service credit | 12 | 20 | 23
Amortization of prior service cost (credit) |  | (1) | (1)
Amortization of settlement charges(c) |  |  | 1
Amortization of settlement charges | 1 | 1 |
MRVA method change | 24 |  |
Net periodic costs | 1 | (22) | (11)
Pension Plan | Duke Energy Ohio |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Amortization of regulatory asset | 1 | 1 | 2
Pension Plan | Duke Energy Ohio | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 4 | 5 |
Service cost | 4 | 5 | 5
Interest cost | 13 | 13 | 15
Expected return on plan assets | (23) | (28) | (28)
Amortization of prior service credit | 4 | 7 | 6
Amortization of prior service cost (credit) |  | (1) |
Amortization of settlement charges | 5 |  |
MRVA method change | 0 |  |
Net periodic costs | 3 | (4) | (2)
Pension Plan | Duke Energy Indiana | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 9 | 10 |
Service cost | 8 | 9 | 9
Interest cost | 20 | 18 | 22
Expected return on plan assets | (37) | (40) | (42)
Amortization of prior service credit | 9 | 13 | 12
Amortization of prior service cost (credit) | (2) | (2) | (2)
Amortization of settlement charges(c) |  |  | 1
Amortization of settlement charges | 1 |  |
MRVA method change | 0 |  |
Net periodic costs |  | (1) |
Pension Plan | Piedmont | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 5 | 6 |
Service cost | 5 | 6 | 6
Interest cost | 8 | 7 | 9
Expected return on plan assets | (24) | (20) | (21)
Amortization of prior service credit | 5 | 10 | 9
Amortization of prior service cost (credit) | (7) | (9) | (9)
Amortization of settlement charges(c) |  |  | 1
Amortization of settlement charges | 7 | 1 |
MRVA method change | 0 |  |
Net periodic costs | (6) | (5) | (5)
Other Post-Retirement Benefit Plans |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 3 | 4 | 4
Interest cost | 17 | 18 | 23
Expected return on plan assets | (10) | (11) | (13)
Amortization of prior service credit | 2 | 2 | 2
Amortization of prior service cost (credit) | (8) | (13) | (14)
Net periodic costs | 4 |  | 2
Amortization of regulatory asset | 4 | 5 | 6
Other Post-Retirement Benefit Plans | Duke Energy Carolinas |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 1 | 1 | 1
Interest cost | 4 | 4 | 5
Expected return on plan assets | (6) | (7) | (8)
Amortization of prior service cost (credit) | (3) | (4) | (4)
Net periodic costs | (4) | (6) | (6)
Other Post-Retirement Benefit Plans | Progress Energy |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  | 1 | 1
Interest cost | 7 | 7 | 10
Amortization of prior service credit | 1 | 1 | 1
Amortization of prior service cost (credit) | (2) | (2) | (3)
Net periodic costs | 6 | 7 | 9
Other Post-Retirement Benefit Plans | Duke Energy Progress |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost | 4 | 4 | 5
Amortization of prior service credit | 1 |  |
Amortization of prior service cost (credit) | (1) | (1) | (1)
Net periodic costs | 4 | 3 | 4
Other Post-Retirement Benefit Plans | Duke Energy Florida |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost | 3 | 3 | 4
Amortization of prior service credit | 1 | 1 | 1
Amortization of prior service cost (credit) | (1) | (1) | (2)
Net periodic costs | 3 | 3 | 3
Other Post-Retirement Benefit Plans | Duke Energy Ohio |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost | 1 | 1 | 1
Amortization of prior service cost (credit) |  | (1) | (1)
Net periodic costs | 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] |  |  |
Service cost |  | 1 | 1
Interest cost | 1 | 1 | 2
Amortization of prior service credit |  | 4 | 4
Amortization of prior service cost (credit) |  | (1) | (1)
Net periodic costs | 1 | 5 | 6
Other Post-Retirement Benefit Plans | Piedmont |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost | 1 | 1 | 1
Expected return on plan assets | (2) | (2) | (2)
Amortization of prior service cost (credit) | (2) | (2) | (2)
Net periodic costs | $ (3) | $ (3) | $ (3)

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