Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2014

Defined Benefit Plan Disclosure [Line Items]

Employee Savings Plan Matching Contributions

The following table includes pretax employer matching contributions made by Duke Energy and expensed by the Subsidiary Registrants.

(in millions)	Duke Energy		Duke Energy Carolinas		Progress Energy		Duke Energy Progress		Duke Energy Florida		Duke Energy Ohio		Duke Energy Indiana
Three Months Ended September 30,
2014(a)	$	30	$	10	$	10	$	7	$	3	$	—	$	1
2013	30		10		12		7		4		—		2
Nine Months Ended September 30,
2014(a)	$	110	$	36	$	33	$	23	$	10	$	2	$	5
2013	101		34		34		19		11		2		5

(a) For the three and nine months ended September 30, 2014, amounts include the additional contribution of 4 percent of eligible pay per pay period for employees not eligible to participate in a defined benefit plan.

Qualified Pension Plans [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 qualified pension plans.

	Three Months Ended September 30, 2014
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
Service cost	$	34		$	10		$	10		$	6		$	5		$	1		$	3
Interest cost on projected benefit obligation	86			22			28			13			14			5			7
Expected return on plan assets	(128		)	(33		)	(44		)	(21		)	(21		)	(7		)	(10		)
Amortization of actuarial loss	37			8			17			8			8			1			3
Amortization of prior service credit	(4		)	(2		)	—			—			—			—			—
Other	3			1			1			—			—			—			—
Net periodic pension costs	$	28		$	6		$	12		$	6		$	6		$	—		$	3

	Three Months Ended September 30, 2013
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
Service cost	$	41		$	12		$	15		$	6		$	8		$	1		$	2
Interest cost on projected benefit obligation	80			20			29			13			13			5			7
Expected return on plan assets	(137		)	(37		)	(50		)	(24		)	(21		)	(7		)	(11		)
Amortization of actuarial loss	61			15			26			11			12			3			6
Amortization of prior service credit	(2		)	(2		)	(1		)	(1		)	(1		)	—			—
Other	2			1			—			1			—			—			1
Net periodic pension costs	$	45		$	9		$	19		$	6		$	11		$	2		$	5

	Nine Months Ended September 30, 2014
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
Service cost	$	102		$	31		$	30		$	16		$	15		$	3		$	7
Interest cost on projected benefit obligation	258			64			84			40			43			15			22
Expected return on plan assets	(383		)	(99		)	(130		)	(64		)	(64		)	(20		)	(30		)
Amortization of actuarial loss	111			26			51			24			24			3			9
Amortization of prior service credit	(11		)	(6		)	(2		)	(1		)	(1		)	—			—
Other	6			2			2			1			1			—			—
Net periodic pension costs	$	83		$	18		$	35		$	16		$	18		$	1		$	8

	Nine Months Ended September 30, 2013
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
Service cost	$	125		$	37		$	45		$	17		$	23		$	4		$	8
Interest cost on projected benefit obligation	240			60			87			38			40			16			21
Expected return on plan assets	(411		)	(111		)	(149		)	(71		)	(65		)	(22		)	(33		)
Amortization of actuarial loss	183			45			76			34			37			9			17
Amortization of prior service credit	(8		)	(5		)	(3		)	(1		)	(2		)	—			—
Other	5			2			1			1			—			—			1
Net periodic pension costs	$	134		$	28		$	57		$	18		$	33		$	7		$	14

Non-Qualified Pension Plans [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 September 30, 2014
(in millions)	Duke Energy		Duke Energy Carolinas		Progress Energy			Duke Energy Progress		Duke Energy Florida
Service cost	$	1	$	—	$	—		$	1	$	—
Interest cost on projected benefit obligation	3		1		2			—		—
Amortization of actuarial loss	1		—		—			—		—
Amortization of prior service credit	—		—		(1		)	—		—
Net periodic pension costs	$	5	$	1	$	1		$	1	$	—

	Three Months Ended September 30, 2013
(in millions)	Duke Energy		Duke Energy Carolinas		Progress Energy		Duke Energy Progress		Duke Energy Florida
Service cost	$	1	$	—	$	1	$	1	$	—
Interest cost on projected benefit obligation	3		—		1		—		—
Amortization of actuarial loss	1		—		1		1		1
Net periodic pension costs	$	5	$	—	$	3	$	2	$	1

	Nine Months Ended September 30, 2014
(in millions)	Duke Energy		Duke Energy Carolinas		Progress Energy			Duke Energy Progress		Duke Energy Florida
Service cost	$	2	$	—	$	1		$	1	$	—
Interest cost on projected benefit obligation	10		1		4			1		1
Amortization of actuarial loss	2		—		1			—		—
Amortization of prior service credit	—		—		(1		)	—		—
Net periodic pension costs	$	14	$	1	$	5		$	2	$	1

	Nine Months Ended September 30, 2013
(in millions)	Duke Energy			Duke Energy Carolinas		Progress Energy			Duke Energy Progress		Duke Energy Florida
Service cost	$	2		$	—	$	1		$	1	$	—
Interest cost on projected benefit obligation	10			1		5			1		1
Amortization of actuarial loss	4			—		3			1		1
Amortization of prior service credit	(1		)	—		(1		)	—		—
Net periodic pension costs	$	15		$	1	$	8		$	3	$	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 September 30, 2014
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Indiana
Service cost	$	2		$	—		$	1		$	—		$	—		$	—
Interest cost on accumulated post-retirement benefit obligation	13			3			6			3			3			1
Expected return on plan assets	(3		)	(2		)	—			—			—			—
Amortization of actuarial loss	9			1			10			8			3			—
Amortization of prior service credit	(31		)	(3		)	(24		)	(19		)	(5		)	—
Net periodic other post-retirement benefit costs	$	(10	)	$	(1	)	$	(7	)	$	(8	)	$	1		$	1

	Three Months Ended September 30, 2013
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy		Duke Energy Progress		Duke Energy Florida		Duke Energy Indiana
Service cost	$	7		$	1		$	6	$	3	$	2	$	1
Interest cost on accumulated post-retirement benefit obligation	19			3			12		7		5		1
Expected return on plan assets	(4		)	(2		)	—		—		—		(1		)
Amortization of actuarial loss	13			—			13		8		4		1
Amortization of prior service credit	(3		)	(2		)	—		—		—		—
Net periodic other post-retirement benefit costs	$	32		$	—		$	31	$	18	$	11	$	2

	Nine Months Ended September 30, 2014
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida			Duke Energy Ohio			Duke Energy Indiana
Service cost	$	7		$	1		$	3		$	1		$	2		$	—		$	—
Interest cost on accumulated post-retirement benefit obligation	38			9			17			8			9			1			4
Expected return on plan assets	(9		)	(6		)	—			—			—			—			(1		)
Amortization of actuarial loss (gain)	29			2			31			23			8			(1		)	—
Amortization of prior service credit	(94		)	(8		)	(71		)	(55		)	(16		)	—			—
Net periodic other post-retirement benefit costs	$	(29	)	$	(2	)	$	(20	)	$	(23	)	$	3		$	—		$	3

	Nine Months Ended September 30, 2013
(in millions)	Duke Energy			Duke Energy Carolinas			Progress Energy			Duke Energy Progress			Duke Energy Florida		Duke Energy Ohio			Duke Energy Indiana
Service cost	$	21		$	2		$	17		$	9		$	6	$	—		$	1
Interest cost on accumulated post-retirement benefit obligation	55			9			35			19			13		1			4
Expected return on plan assets	(11		)	(7		)	—			—			—		—			(1		)
Amortization of actuarial loss (gain)	39			2			42			26			12		(1		)	1
Amortization of prior service credit	(9		)	(6		)	(1		)	(1		)	—		—			—
Net periodic other post-retirement benefit costs	$	95		$	—		$	93		$	53		$	31	$	—		$	5