Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2024

Qualified Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Pension Costs

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

	Three Months Ended March 31, 2024
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	28	$	9	$	8	$	5	$	3	$	1	$	2	$	1
Interest cost on projected benefit obligation	82		20		26		12		14		4		6		2
Expected return on plan assets	(154)		(41)		(54)		(25)		(29)		(6)		(10)		(5)
Amortization of actuarial loss	8		2		2		1		1		—		1		1
Amortization of prior service credit	(3)		—		—		—		—		—		—		(2)
Amortization of settlement charges	5		2		1		1		—		—		—		1
Net periodic pension costs	$	(34)	$	(8)	$	(17)	$	(6)	$	(11)	$	(1)	$	(1)	$	(2)

	Three Months Ended March 31, 2023
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	30	$	10	$	9	$	5	$	3	$	1	$	1	$	1
Interest cost on projected benefit obligation	86		21		27		12		14		4		7		2
Expected return on plan assets	(147)		(40)		(50)		(23)		(26)		(6)		(10)		(5)
Amortization of actuarial loss	2		—		1		—		1		—		1		—
Amortization of prior service credit	(3)		—		—		—		—		—		—		(2)
Amortization of settlement charges	5		2		1		1		—		—		—		1
Net periodic pension costs	$	(27)	$	(7)	$	(12)	$	(5)	$	(8)	$	(1)	$	(1)	$	(3)