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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Employee Benefit Plans EMPLOYEE BENEFIT PLANS
DEFINED BENEFIT RETIREMENT PLANS
Duke Energy and certain subsidiaries maintain, and the Subsidiary Registrants participate in, qualified and non-qualified, non-contributory defined benefit retirement plans. Duke Energy's policy is to fund amounts on an actuarial basis to provide assets sufficient to meet benefit payments to be paid to plan participants.
The following table includes information related to the Duke Energy Registrants' contributions to its qualified defined benefit pension plans. There were no contributions made during the nine months ended September 30, 2025.
Nine Months Ended September 30, 2024
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Contributions made:
2024100 26 23 14 9 5 8 3 
QUALIFIED PENSION PLANS
The following tables include the components of net periodic pension costs for qualified pension plans.
Three Months Ended September 30, 2025
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$26 $9 $8 $5 $3 $1 $1 $1 
Interest cost on projected benefit obligation83 20 25 11 14 4 6 3 
Expected return on plan assets(149)(38)(55)(24)(30)(6)(10)(5)
Amortization of actuarial loss16 3 5 2 2 1 2 1 
Amortization of prior service credit(4)— — — — — — (2)
Amortization of settlement charges6 3 1 1 1 — — 1 
Net periodic pension costs$(22)$(3)$(16)$(5)$(10)$— $(1)$(1)
Three Months Ended September 30, 2024
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$28 $9 $8 $5 $3 $1 $1 $1 
Interest cost on projected benefit obligation82 19 26 12 14 5 6 2 
Expected return on plan assets(154)(41)(55)(25)(29)(6)(10)(5)
Amortization of actuarial loss9 2 2 1 1 — 1 1 
Amortization of prior service credit(3)— — — — — — (1)
Amortization of settlement charges17 5 7 6 — 2 — 2 
Net periodic pension costs$(21)$(6)$(12)$(1)$(11)$2 $(2)$— 
Nine Months Ended September 30, 2025
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$80 $27 $23 $14 $9 $2 $4 $3 
Interest cost on projected benefit obligation247 59 77 34 43 12 19 8 
Expected return on plan assets(447)(114)(165)(73)(90)(17)(30)(15)
Amortization of actuarial loss46 10 14 6 6 2 4 3 
Amortization of prior service credit(10)— — — — — (1)(5)
Amortization of settlement charges19 9 5 4 2 — 1 3 
Net periodic pension costs$(65)$(9)$(46)$(15)$(30)$(1)$(3)$(3)
Nine Months Ended September 30, 2024
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$85 $28 $24 $15 $10 $2 $4 $3 
Interest cost on projected benefit obligation247 59 78 36 42 13 19 7 
Expected return on plan assets(462)(122)(163)(75)(87)(19)(31)(15)
Amortization of actuarial loss25 6 7 4 3 1 3 2 
Amortization of prior service credit(10)— — — — — (1)(5)
Amortization of settlement charges26 9 9 8 1 2 1 4 
Net periodic pension costs$(89)$(20)$(45)$(12)$(31)$(1)$(5)$(4)
NON-QUALIFIED PENSION PLANS
Net periodic pension costs for non-qualified pension plans were not material for the three and nine months ended September 30, 2025, and 2024.
OTHER POST-RETIREMENT BENEFIT PLANS
Net periodic costs for OPEB plans were not material for the three and nine months ended September 30, 2025, and 2024.