Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2016

Defined Benefit Plan Disclosure [Line Items]

Employee Savings Plan Matching Contributions

The following table presents employer contributions made by Duke Energy and expensed by the Subsidiary Registrants.



			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana
Three Months Ended June 30,
2016	$	39	$	13	$	12	$	8	$	4	$	1	$	2
2015	37		13		12		8		3		1		2
Six Months Ended June 30,
2016	$	91	$	31	$	27	$	19	$	8	$	2	$	4
2015	86		29		26		19		7		2		4

Qualified Pension Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Plan Contributions by Employer

The following table includes information related to the Duke Energy Registrants’ contributions to its U.S. qualified defined benefit pension plans. Duke Energy did not make any contributions to its U.S. qualified defined benefit pension plans during the six months ended June 30, 2016.

Six Months Ended June 30, 2015

Duke

Energy

Progress

Energy

(in millions)

Energy

Carolinas

Energy

Progress

Florida

Ohio

Indiana

Contributions

132

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, 2016
				Duke						Duke			Duke			Duke			Duke
	Duke			Energy			Progress			Energy			Energy			Energy			Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio			Indiana
Service cost	$	37		$	12		$	10		$	6		$	5		$	1		$	2
Interest cost on projected benefit obligation	83			22			27			13			14			5			7
Expected return on plan assets	(129		)	(36		)	(42		)	(20		)	(21		)	(7		)	(11		)
Amortization of actuarial loss	33			8			13			5			7			1			3
Amortization of prior service credit	(4		)	(2		)	(1		)	(1		)	—			—			—
Other	1			—			—			1			—			—			—
Net periodic pension costs	$	21		$	4		$	7		$	4		$	5		$	—		$	1



	Three Months Ended June 30, 2015
				Duke						Duke			Duke			Duke			Duke
	Duke			Energy			Progress			Energy			Energy			Energy			Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio			Indiana
Service cost	$	39		$	12		$	11		$	6		$	5		$	1		$	2
Interest cost on projected benefit obligation	81			20			26			12			13			4			7
Expected return on plan assets	(129		)	(33		)	(41		)	(21		)	(22		)	(7		)	(11		)
Amortization of actuarial loss	44			10			17			9			8			3			4
Amortization of prior service credit	(3		)	(2		)	(1		)	(1		)	(1		)	—			—
Other	2			—			—			1			1			—			—
Net periodic pension costs	$	34		$	7		$	12		$	6		$	4		$	1		$	2



	Six Months Ended June 30, 2016
				Duke						Duke			Duke			Duke			Duke
	Duke			Energy			Progress			Energy			Energy			Energy			Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio			Indiana
Service cost	$	73		$	24		$	21		$	12		$	10		$	2		$	4
Interest cost on projected benefit obligation	166			43			53			25			28			10			14
Expected return on plan assets	(258		)	(71		)	(84		)	(41		)	(42		)	(14		)	(21		)
Amortization of actuarial loss	66			16			27			11			14			2			6
Amortization of prior service credit	(8		)	(4		)	(2		)	(1		)	—			—			—
Other	4			1			1			1			—			—			—
Net periodic pension costs	$	43		$	9		$	16		$	7		$	10		$	—		$	3



	Six Months Ended June 30, 2015
				Duke						Duke			Duke			Duke			Duke
	Duke			Energy			Progress			Energy			Energy			Energy			Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio			Indiana
Service cost	$	79		$	25		$	22		$	12		$	10		$	2		$	5
Interest cost on projected benefit obligation	163			41			52			24			27			9			14
Expected return on plan assets	(258		)	(69		)	(84		)	(41		)	(44		)	(13		)	(21		)
Amortization of actuarial loss	87			20			34			17			16			5			7
Amortization of prior service credit	(7		)	(4		)	(2		)	(1		)	(1		)	—			—
Other	4			1			1			1			1			—			—
Net periodic pension costs	$	68		$	14		$	23		$	12		$	9		$	3		$	5

Non-Qualified Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Pension Costs

The following tables include the components of net periodic pension costs for non-qualified pension plans for registrants with non-qualified pension costs.



	Three Months Ended June 30, 2016
			Duke				Duke		Duke
	Duke		Energy		Progress		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida
Service cost	$	1	$	—	$	—	$	—	$	—
Interest cost on projected benefit obligation	3		1		1		1		1
Amortization of actuarial loss	2		—		—		—		—
Net periodic pension costs	$	6	$	1	$	1	$	1	$	1



	Three Months Ended June 30, 2015
			Duke				Duke		Duke
	Duke		Energy		Progress		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida
Service cost	$	1	$	—	$	—	$	—	$	—
Interest cost on projected benefit obligation	3		—		1		1		1
Amortization of actuarial loss	1		—		1		—		—
Net periodic pension costs	$	5	$	—	$	2	$	1	$	1



	Six Months Ended June 30, 2016
			Duke				Duke		Duke
	Duke		Energy		Progress		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida
Service cost	$	1	$	—	$	—	$	—	$	—
Interest cost on projected benefit obligation	7		1		2		1		1
Amortization of actuarial loss	4		—		1		—		—
Net periodic pension costs	$	12	$	1	$	3	$	1	$	1



	Six Months Ended June 30, 2015
			Duke				Duke		Duke
	Duke		Energy		Progress		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida
Service cost	$	1	$	—	$	1	$	—	$	—
Interest cost on projected benefit obligation	7		1		2		1		1
Amortization of actuarial loss	3		—		1		—		1
Net periodic pension costs	$	11	$	1	$	4	$	1	$	2

Other Post-Retirement Benefit Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Pension Costs

The following tables include the components of net periodic other post-retirement benefit costs.



	Three Months Ended June 30, 2016
				Duke						Duke			Duke			Duke			Duke
	Duke			Energy			Progress			Energy			Energy			Energy			Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio			Indiana
Service cost	$	1		$	—		$	—		$	—		$	—		$	—		$	—
Interest cost on accumulated post-retirement benefit obligation	9			2			3			2			1			1			1
Expected return on plan assets	(4		)	(2		)	—			—			—			—			(1		)
Amortization of actuarial loss (gain)	2			(1		)	6			3			3			(1		)	—
Amortization of prior service credit	(36		)	(3		)	(25		)	(17		)	(9		)	—			—
Net periodic other post-retirement benefit costs	$	(28	)	$	(4	)	$	(16	)	$	(12	)	$	(5	)	$	—		$	—



	Three Months Ended June 30, 2015
				Duke						Duke			Duke			Duke		Duke
	Duke			Energy			Progress			Energy			Energy			Energy		Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio		Indiana
Service cost	$	1		$	1		$	1		$	—		$	—		$	—	$	—
Interest cost on accumulated post-retirement benefit obligation	9			2			3			2			1			1		2
Expected return on plan assets	(3		)	(2		)	—			—			—			—		—
Amortization of actuarial loss (gain)	7			(1		)	7			4			2			—		(1		)
Amortization of prior service credit	(35		)	(3		)	(25		)	(16		)	(7		)	—		—
Net periodic other post-retirement benefit costs	$	(21	)	$	(3	)	$	(14	)	$	(10	)	$	(4	)	$	1	$	1



	Six Months Ended June 30, 2016
				Duke						Duke			Duke			Duke			Duke
	Duke			Energy			Progress			Energy			Energy			Energy			Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio			Indiana
Service cost	$	2		$	—		$	—		$	—		$	—		$	—		$	—
Interest cost on accumulated post-retirement benefit obligation	17			4			7			4			3			1			2
Expected return on plan assets	(7		)	(4		)	—			—			—			—			(1		)
Amortization of actuarial loss (gain)	3			(2		)	11			6			5			(1		)	(1		)
Amortization of prior service credit	(71		)	(6		)	(51		)	(34		)	(18		)	—			—
Net periodic other post-retirement benefit costs	$	(56	)	$	(8	)	$	(33	)	$	(24	)	$	(10	)	$	—		$	—



	Six Months Ended June 30, 2015
				Duke						Duke			Duke			Duke		Duke
	Duke			Energy			Progress			Energy			Energy			Energy		Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio		Indiana
Service cost	$	3		$	1		$	1		$	—		$	—		$	—	$	—
Interest cost on accumulated post-retirement benefit obligation	18			4			7			4			3			1		2
Expected return on plan assets	(6		)	(4		)	—			—			—			—		—
Amortization of actuarial loss (gain)	13			(1		)	14			9			5			—		(1		)
Amortization of prior service credit	(70		)	(7		)	(51		)	(33		)	(16		)	—		—
Net periodic other post-retirement benefit costs	$	(42	)	$	(7	)	$	(29	)	$	(20	)	$	(8	)	$	1	$	1