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Employee Benefit Plans (Tables) - USD ($)
$ in Millions

9 Months Ended

Sep. 30, 2023

Sep. 30, 2022

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
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Contributions made:
2023	$	100	$	26	$	22	$	13	$	9	$	5	$	8	$	3
2022	$	58	$	15	$	13	$	8	$	5	$	3	$	5	$	2

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


	Three Months Ended September 30, 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	$	28	$	9	$	9	$	5	$	3	$	1	$	1	$	1
Interest cost on projected benefit obligation	86		21		26		12		14		4		6		2
Expected return on plan assets	(147)		(40)		(50)		(24)		(26)		(6)		(10)		(5)
Amortization of actuarial loss	2		—		1		—		1		—		1		—
Amortization of prior service credit	(3)		—		—		—		—		—		—		(1)
Amortization of settlement charges	5		3		1		1		—		—		—		1
Net periodic pension costs	$	(29)	$	(7)	$	(13)	$	(6)	$	(8)	$	(1)	$	(2)	$	(2)


	Three Months Ended September 30, 2022
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	39	$	12	$	11	$	6	$	4	$	1	$	3	$	1
Interest cost on projected benefit obligation	58		14		19		9		10		3		4		2
Expected return on plan assets	(140)		(38)		(46)		(22)		(24)		(6)		(9)		(6)
Amortization of actuarial loss	24		5		6		3		3		2		3		2
Amortization of prior service credit	(5)		(1)		—		—		—		—		—		(2)
Amortization of settlement charges	14		3		5		4		1		2		1		2
Net periodic pension costs	$	(10)	$	(5)	$	(5)	$	—	$	(6)	$	2	$	2	$	(1)


	Nine Months Ended September 30, 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	$	87	$	28	$	25	$	15	$	10	$	2	$	4	$	3
Interest cost on projected benefit obligation	258		63		80		37		43		13		20		7
Expected return on plan assets	(441)		(120)		(149)		(70)		(78)		(18)		(30)		(15)
Amortization of actuarial loss	7		1		3		1		2		—		2		—
Amortization of prior service credit	(10)		—		—		—		—		—		(1)		(5)
Amortization of settlement charges	14		7		3		3		1		—		1		3
Net periodic pension costs	$	(85)	$	(21)	$	(38)	$	(14)	$	(22)	$	(3)	$	(4)	$	(7)


	Nine Months Ended September 30, 2022
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Service cost	$	120	$	38	$	34	$	20	$	14	$	3	$	7	$	4
Interest cost on projected benefit obligation	175		41		55		25		30		9		14		6
Expected return on plan assets	(421)		(114)		(139)		(66)		(72)		(17)		(28)		(18)
Amortization of actuarial loss	71		15		19		10		9		4		8		5
Amortization of prior service credit	(14)		(3)		—		—		—		—		(1)		(6)
Amortization of settlement charges	18		6		6		5		1		2		1		2
Net periodic pension costs	$	(51)	$	(17)	$	(25)	$	(6)	$	(18)	$	1	$	1	$	(7)