Employee Benefit Plans (Tables)

6 Months Ended

Jun. 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 June 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	$	44	$	14	$	12	$	8	$	6	$	1	$	3	$	2
Interest cost on projected benefit obligation	55		12		18		8		9		4		4		2
Expected return on plan assets	(140)		(35)		(47)		(21)		(25)		(7)		(10)		(5)
Amortization of actuarial loss	34		8		9		4		5		1		4		3
Amortization of prior service credit	(8)		(2)		—		(1)		—		—		(1)		(4)
Amortization of settlement charges	2		2		—		1		—		—		—		—
Net periodic pension costs	$	(13)	$	(1)	$	(8)	$	(1)	$	(5)	$	(1)	$	—	$	(2)

	Three Months Ended June 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	$	42	$	14	$	12	$	8	$	6	$	1	$	2	$	2
Interest cost on projected benefit obligation	68		15		22		9		11		4		5		3
Expected return on plan assets	(143)		(36)		(47)		(22)		(26)		(7)		(10)		(6)
Amortization of actuarial loss	30		7		9		4		5		1		3		3
Amortization of prior service credit	(8)		(2)		(1)		(1)		(1)		—		(1)		(3)
Amortization of settlement charges	3		1		—		1		—		—		—		—
Net periodic pension costs	$	(8)	$	(1)	$	(5)	$	(1)	$	(5)	$	(1)	$	(1)	$	(1)

	Six Months Ended June 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	$	88	$	28	$	25	$	15	$	11	$	2	$	5	$	3
Interest cost on projected benefit obligation	110		25		35		15		19		7		9		4
Expected return on plan assets	(279)		(70)		(94)		(42)		(51)		(14)		(20)		(10)
Amortization of actuarial loss	67		15		19		9		10		3		7		5
Amortization of prior service credit	(15)		(4)		(1)		(1)		—		—		(1)		(5)
Amortization of settlement charges	4		3		1		1		—		—		—		—
Net periodic pension costs	$	(25)	$	(3)	$	(15)	$	(3)	$	(11)	$	(2)	$	—	$	(3)

	Six Months Ended June 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	$	83	$	26	$	24	$	14	$	11	$	2	$	4	$	3
Interest cost on projected benefit obligation	135		31		43		19		23		8		11		5
Expected return on plan assets	(286)		(72)		(95)		(44)		(51)		(14)		(21)		(11)
Amortization of actuarial loss	64		14		20		9		11		3		6		5
Amortization of prior service credit	(16)		(4)		(2)		(1)		(1)		—		(1)		(5)
Amortization of settlement charges	5		2		1		1		—		—		—		—
Net periodic pension costs	$	(15)	$	(3)	$	(9)	$	(2)	$	(7)	$	(1)	$	(1)	$	(3)