Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2021

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, 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)	$	—	$	—

	Three Months Ended September 30, 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	32		7		10		4		6		2		3		2
Amortization of prior service credit	(8)		(2)		—		—		—		—		—		(2)
Amortization of settlement charges	11		6		5		5		1		—		1		1
Net periodic pension costs	$	—	$	3	$	—	$	3	$	(1)	$	—	$	1	$	(1)

	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)

	Nine Months Ended September 30, 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	$	124	$	38	$	36	$	20	$	16	$	3	$	6	$	4
Interest cost on projected benefit obligation	202		47		64		29		35		12		17		7
Expected return on plan assets	(429)		(108)		(143)		(66)		(76)		(21)		(32)		(16)
Amortization of actuarial loss	96		21		30		13		17		5		9		7
Amortization of prior service credit	(24)		(6)		(2)		(1)		(1)		—		(1)		(7)
Amortization of settlement charges	16		8		6		6		1		—		1		1
Net periodic pension costs	$	(15)	$	—	$	(9)	$	1	$	(8)	$	(1)	$	—	$	(4)