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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2023
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.
Nine Months Ended September 30, 2023 and 2022
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Contributions made:
2023$100 $26 $22 $13 $9 $5 $8 $3 
2022$58 $15 $13 $8 $5 $3 $5 $2 
QUALIFIED PENSION PLANS
The following tables include the components of net periodic pension costs for qualified pension plans.
Three Months Ended September 30, 2023
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$28 $9 $9 $5 $3 $1 $1 $1 
Interest cost on projected benefit obligation86 21 26 12 14 4 6 2 
Expected return on plan assets(147)(40)(50)(24)(26)(6)(10)(5)
Amortization of actuarial loss2 — 1 — 1 — 1 — 
Amortization of prior service credit(3)— — — — — — (1)
Amortization of settlement charges5 3 1 1 — — — 1 
Net periodic pension costs$(29)$(7)$(13)$(6)$(8)$(1)$(2)$(2)
Three Months Ended September 30, 2022
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$39 $12 $11 $6 $4 $1 $3 $1 
Interest cost on projected benefit obligation58 14 19 9 10 3 4 2 
Expected return on plan assets(140)(38)(46)(22)(24)(6)(9)(6)
Amortization of actuarial loss24 5 6 3 3 2 3 2 
Amortization of prior service credit(5)(1)— — — — — (2)
Amortization of settlement charges14 3 5 4 1 2 1 2 
Net periodic pension costs$(10)$(5)$(5)$— $(6)$2 $2 $(1)
Nine Months Ended September 30, 2023
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$87 $28 $25 $15 $10 $2 $4 $3 
Interest cost on projected benefit obligation258 63 80 37 43 13 20 7 
Expected return on plan assets(441)(120)(149)(70)(78)(18)(30)(15)
Amortization of actuarial loss7 1 3 1 2 — 2 — 
Amortization of prior service credit(10)— — — — — (1)(5)
Amortization of settlement charges14 7 3 3 1 — 1 3 
Net periodic pension costs$(85)$(21)$(38)$(14)$(22)$(3)$(4)$(7)
Nine Months Ended September 30, 2022
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$120 $38 $34 $20 $14 $3 $7 $4 
Interest cost on projected benefit obligation175 41 55 25 30 9 14 6 
Expected return on plan assets(421)(114)(139)(66)(72)(17)(28)(18)
Amortization of actuarial loss71 15 19 10 9 4 8 5 
Amortization of prior service credit(14)(3)— — — — (1)(6)
Amortization of settlement charges18 6 6 5 1 2 1 2 
Net periodic pension costs$(51)$(17)$(25)$(6)$(18)$1 $1 $(7)
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, 2023, and 2022.
OTHER POST-RETIREMENT BENEFIT PLANS
Net periodic costs for OPEB plans were not material for the three and nine months ended September 30, 2023, and 2022.