Employee Benefit Plans

3 Months Ended

Mar. 31, 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.

QUALIFIED PENSION PLANS

The following tables include the components of net periodic pension costs for qualified pension plans.

	Three Months Ended March 31, 2021
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	44	$	14	$	13	$	7	$	5	$	1	$	2	$	1
Interest cost on projected benefit obligation	55		13		17		7		10		3		5		2
Expected return on plan assets	(139)		(35)		(47)		(21)		(26)		(7)		(10)		(5)
Amortization of actuarial loss	33		7		10		5		5		2		3		2
Amortization of prior service credit	(7)		(2)		(1)		—		—		—		—		(1)
Amortization of settlement charges	2		1		1		—		—		—		—		—
Net periodic pension costs	$	(12)	$	(2)	$	(7)	$	(2)	$	(6)	$	(1)	$	—	$	(1)

	Three Months Ended March 31, 2020
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	41	$	12	$	12	$	6	$	5	$	1	$	2	$	1
Interest cost on projected benefit obligation	67		16		21		10		12		4		6		2
Expected return on plan assets	(143)		(36)		(48)		(22)		(25)		(7)		(11)		(5)
Amortization of actuarial loss	34		7		11		5		6		2		3		2
Amortization of prior service credit	(8)		(2)		(1)		—		—		—		—		(2)
Amortization of settlement charges	2		1		1		—		—		—		—		—
Net periodic pension costs	$	(7)	$	(2)	$	(4)	$	(1)	$	(2)	$	—	$	—	$	(2)

NON-QUALIFIED PENSION PLANS

Net periodic pension costs for non-qualified pension plans were not material for the three months ended March 31, 2021, and 2020.

OTHER POST-RETIREMENT BENEFIT PLANS

Net periodic costs for OPEB plans were not material for the three months ended March 31, 2021, and 2020.