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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2021
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.
Duke Energy monitors lump-sum benefit payment activity associated with its defined benefit retirement plans. Duke Energy does not believe it is probable that total lump-sum benefit payments will exceed the settlement threshold, defined as the sum of service cost and interest cost on projected benefit obligation components of net periodic pension costs, for any of its defined benefit retirement plans in 2021. If Duke Energy believed it were probable that total lump-sum benefit payments would exceed the settlement threshold in 2021, then a settlement charge reflecting the recognition of a pro-rata portion of previously unrecognized actuarial losses, equal to the percentage of reduction in the projected benefit obligation resulting from total lump-sum benefit payments, would be recognized.
QUALIFIED PENSION PLANS
The following tables include the components of net periodic pension costs for qualified pension plans.
Three Months Ended September 30, 2021
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$43 $14 $13 $7 $5 $2 $2 $1 
Interest cost on projected benefit obligation55 13 17 8 10 2 5 2 
Expected return on plan assets(139)(36)(47)(21)(25)(7)(10)(5)
Amortization of actuarial loss33 7 10 5 5 2 3 2 
Amortization of prior service credit(7)(2)(1)— (1)— — (1)
Amortization of settlement charges2 1 1 — — — — 1 
Net periodic pension costs$(13)$(3)$(7)$(1)$(6)$(1)$— $— 
Three Months Ended September 30, 2020
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$41 $12 $12 $6 $5 $1 $2 $1 
Interest cost on projected benefit obligation67 16 21 10 12 4 6 2 
Expected return on plan assets(143)(36)(48)(22)(25)(7)(11)(5)
Amortization of actuarial loss32 7 10 4 6 2 3 2 
Amortization of prior service credit(8)(2)— — — — — (2)
Amortization of settlement charges11 6 5 5 1 — 1 1 
Net periodic pension costs$— $3 $— $3 $(1)$— $1 $(1)
Nine Months Ended September 30, 2021
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$131 $42 $38 $22 $16 $4 $7 $4 
Interest cost on projected benefit obligation165 38 52 23 29 9 14 6 
Expected return on plan assets(418)(106)(141)(63)(76)(21)(30)(15)
Amortization of actuarial loss100 22 29 14 15 5 10 7 
Amortization of prior service credit(22)(6)(2)(1)(1)— (1)(6)
Amortization of settlement charges6 4 2 1 — — — 1 
Net periodic pension costs$(38)$(6)$(22)$(4)$(17)$(3)$— $(3)
Nine Months Ended September 30, 2020
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Service cost$124 $38 $36 $20 $16 $3 $6 $4 
Interest cost on projected benefit obligation202 47 64 29 35 12 17 7 
Expected return on plan assets(429)(108)(143)(66)(76)(21)(32)(16)
Amortization of actuarial loss96 21 30 13 17 5 9 7 
Amortization of prior service credit(24)(6)(2)(1)(1)— (1)(7)
Amortization of settlement charges16 8 6 6 1 — 1 1 
Net periodic pension costs$(15)$— $(9)$1 $(8)$(1)$— $(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, 2021, and 2020.
OTHER POST-RETIREMENT BENEFIT PLANS
Net periodic costs for OPEB plans were not material for the three and nine months ended September 30, 2021, and 2020.