Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2020

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, 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	)

	Three Months Ended September 30, 2019
				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		$	13		$	13		$	7		$	5		$	1		$	2		$	1
Interest cost on projected benefit obligation	77			17			24			10			14			5			6			2
Expected return on plan assets	(140		)	(36		)	(45		)	(22		)	(22		)	(7		)	(11		)	(5		)
Amortization of actuarial loss	28			6			10			4			6			2			3			2
Amortization of prior service credit	(8		)	(2		)	(1		)	—			—			—			—			(2		)
Net periodic pension costs	$	(1	)	$	(2	)	$	1		$	(1	)	$	3		$	1		$	—		$	(2	)

	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	)

	Nine Months Ended September 30, 2019
				Duke						Duke			Duke			Duke			Duke
	Duke			Energy			Progress			Energy			Energy			Energy			Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio			Indiana			Piedmont
Service cost	$	116		$	37		$	34		$	19		$	15		$	3		$	6		$	4
Interest cost on projected benefit obligation	242			58			76			34			41			14			19			8
Expected return on plan assets	(426		)	(111		)	(134		)	(66		)	(66		)	(21		)	(32		)	(16		)
Amortization of actuarial loss	77			17			28			10			18			3			6			5
Amortization of prior service credit	(24		)	(6		)	(2		)	(1		)	(1		)	—			(1		)	(7		)
Net periodic pension costs	$	(15	)	$	(5	)	$	2		$	(4	)	$	7		$	(1	)	$	(2	)	$	(6	)