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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2024
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 June 30, 2024
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$29 $10 $8 $5 $4 $— $1 $1 
Interest cost on projected benefit obligation83 20 26 12 14 4 7 3 
Expected return on plan assets(154)(40)(54)(25)(29)(7)(11)(5)
Amortization of actuarial loss8 2 3 2 1 1 1 — 
Amortization of prior service credit(4)— — — — — (1)(2)
Amortization of settlement charges4 2 1 1 1 — 1 1 
Net periodic pension costs$(34)$(6)$(16)$(5)$(9)$(2)$(2)$(2)
Three Months Ended June 30, 2023
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$29 $9 $7 $5 $4 $— $2 $1 
Interest cost on projected benefit obligation86 21 27 13 15 5 7 3 
Expected return on plan assets(147)(40)(49)(23)(26)(6)(10)(5)
Amortization of actuarial loss3 1 1 1 — — — — 
Amortization of prior service credit(4)— — — — — (1)(2)
Amortization of settlement charges4 2 1 1 1 — 1 1 
Net periodic pension costs$(29)$(7)$(13)$(3)$(6)$(1)$(1)$(2)
Six Months Ended June 30, 2024
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$57 $19 $16 $10 $7 $1 $3 $2 
Interest cost on projected benefit obligation165 40 52 24 28 8 13 5 
Expected return on plan assets(308)(81)(108)(50)(58)(13)(21)(10)
Amortization of actuarial loss16 4 5 3 2 1 2 1 
Amortization of prior service credit(7)— — — — — (1)(4)
Amortization of settlement charges9 4 2 2 1 — 1 2 
Net periodic pension costs$(68)$(14)$(33)$(11)$(20)$(3)$(3)$(4)
Six Months Ended June 30, 2023
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$59 $19 $16 $10 $7 $1 $3 $2 
Interest cost on projected benefit obligation172 42 54 25 29 9 14 5 
Expected return on plan assets(294)(80)(99)(46)(52)(12)(20)(10)
Amortization of actuarial loss5 1 2 1 1 — 1 — 
Amortization of prior service credit(7)— — — — — (1)(4)
Amortization of settlement charges9 4 2 2 1 — 1 2 
Net periodic pension costs$(56)$(14)$(25)$(8)$(14)$(2)$(2)$(5)
NON-QUALIFIED PENSION PLANS
Net periodic pension costs for non-qualified pension plans were not material for the three and six months ended June 30, 2024, and 2023.
OTHER POST-RETIREMENT BENEFIT PLANS
Net periodic costs for OPEB plans were not material for the three and six months ended June 30, 2024, and 2023.