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Employee Benefit Plans
 3 Months Ended
Mar. 31, 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.
QUALIFIED PENSION PLANS
The following tables include the components of net periodic pension costs for qualified pension plans.
Three Months Ended March 31, 2025
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$27 $9 $7 $5 $3 $— $1 $1 
Interest cost on projected benefit obligation82 19 26 11 14 4 7 3 
Expected return on plan assets(149)(38)(55)(24)(30)(5)(10)(5)
Amortization of actuarial loss15 4 5 2 2 1 1 1 
Amortization of prior service credit(3)— — — — — — (2)
Amortization of settlement charges6 3 2 1 1 — — 1 
Net periodic pension costs$(22)$(3)$(15)$(5)$(10)$— $(1)$(1)
Three Months Ended March 31, 2024
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$28 $9 $8 $5 $3 $1 $2 $1 
Interest cost on projected benefit obligation82 20 26 12 14 4 6 2 
Expected return on plan assets(154)(41)(54)(25)(29)(6)(10)(5)
Amortization of actuarial loss8 2 2 1 1 — 1 1 
Amortization of prior service credit(3)— — — — — — (2)
Amortization of settlement charges5 2 1 1 — — — 1 
Net periodic pension costs$(34)$(8)$(17)$(6)$(11)$(1)$(1)$(2)
NON-QUALIFIED PENSION PLANS
Net periodic pension costs for non-qualified pension plans were not material for the three months ended March 31, 2025, and 2024.
OTHER POST-RETIREMENT BENEFIT PLANS
Net periodic costs for OPEB plans were not material for the three months ended March 31, 2025, and 2024.