Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2022

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures

The following table includes information related to the Duke Energy Registrants' contributions to its qualified defined benefit pension plans.

	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
Contributions made	$	58	$	15	$	13	$	8	$	5	$	3	$	5	$	2

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 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)

	Three Months Ended September 30, 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	$	43	$	14	$	13	$	7	$	5	$	2	$	2	$	1
Interest cost on projected benefit obligation	55		13		17		8		10		2		5		2
Expected return on plan assets	(139)		(36)		(47)		(21)		(25)		(7)		(10)		(5)
Amortization of actuarial loss	33		7		10		5		5		2		3		2
Amortization of prior service credit	(7)		(2)		(1)		—		(1)		—		—		(1)
Amortization of settlement charges	2		1		1		—		—		—		—		1
Net periodic pension costs	$	(13)	$	(3)	$	(7)	$	(1)	$	(6)	$	(1)	$	—	$	—

	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)

	Nine Months Ended September 30, 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	$	131	$	42	$	38	$	22	$	16	$	4	$	7	$	4
Interest cost on projected benefit obligation	165		38		52		23		29		9		14		6
Expected return on plan assets	(418)		(106)		(141)		(63)		(76)		(21)		(30)		(15)
Amortization of actuarial loss	100		22		29		14		15		5		10		7
Amortization of prior service credit	(22)		(6)		(2)		(1)		(1)		—		(1)		(6)
Amortization of settlement charges	6		4		2		1		—		—		—		1
Net periodic pension costs	$	(38)	$	(6)	$	(22)	$	(4)	$	(17)	$	(3)	$	—	$	(3)