Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2023

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, 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	$	29	$	9	$	7	$	5	$	4	$	—	$	2	$	1
Interest cost on projected benefit obligation	86		21		27		13		15		5		7		3
Expected return on plan assets	(147)		(40)		(49)		(23)		(26)		(6)		(10)		(5)
Amortization of actuarial loss	3		1		1		1		—		—		—		—
Amortization of prior service credit	(4)		—		—		—		—		—		(1)		(2)
Amortization of settlement charges	4		2		1		1		1		—		1		1
Net periodic pension costs	$	(29)	$	(7)	$	(13)	$	(3)	$	(6)	$	(1)	$	(1)	$	(2)

	Three Months Ended June 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	$	41	$	14	$	11	$	7	$	6	$	1	$	2	$	2
Interest cost on projected benefit obligation	59		13		18		8		10		3		5		2
Expected return on plan assets	(141)		(38)		(47)		(22)		(24)		(6)		(10)		(6)
Amortization of actuarial loss	23		5		7		4		3		1		3		1
Amortization of prior service credit	(4)		(1)		—		—		—		—		(1)		(2)
Amortization of settlement charges	2		2		—		1		—		—		—		—
Net periodic pension costs	$	(20)	$	(5)	$	(11)	$	(2)	$	(5)	$	(1)	$	(1)	$	(3)

	Six Months Ended June 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	$	59	$	19	$	16	$	10	$	7	$	1	$	3	$	2
Interest cost on projected benefit obligation	172		42		54		25		29		9		14		5
Expected return on plan assets	(294)		(80)		(99)		(46)		(52)		(12)		(20)		(10)
Amortization of actuarial loss	5		1		2		1		1		—		1		—
Amortization of prior service credit	(7)		—		—		—		—		—		(1)		(4)
Amortization of settlement charges	9		4		2		2		1		—		1		2
Net periodic pension costs	$	(56)	$	(14)	$	(25)	$	(8)	$	(14)	$	(2)	$	(2)	$	(5)

	Six Months Ended June 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	$	81	$	26	$	23	$	14	$	10	$	2	$	4	$	3
Interest cost on projected benefit obligation	117		27		36		16		20		6		10		4
Expected return on plan assets	(281)		(76)		(93)		(44)		(48)		(11)		(19)		(12)
Amortization of actuarial loss	47		10		13		7		6		2		5		3
Amortization of prior service credit	(9)		(2)		—		—		—		—		(1)		(4)
Amortization of settlement charges	4		3		1		1		—		—		—		—
Net periodic pension costs	$	(41)	$	(12)	$	(20)	$	(6)	$	(12)	$	(1)	$	(1)	$	(6)