Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Defined Benefit Plan Disclosure [Line Items]

Employee Savings Plan Matching Contributions

(in millions)	Duke Energy		Duke Energy Carolinas		Progress Energy		Duke Energy Progress		Duke Energy Florida		Duke Energy Ohio		Duke Energy Indiana
For the three months ended March 31,
2014	$	43	$	14	$	12	$	9	$	4	$	1	$	2
2013		41		14		12		6		4		1		2

Qualified Pension Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Pension Costs

	Three Months Ended March 31, 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	$	5	$	5	$	1	$	2
Interest cost on projected benefit obligation		86		21		28		13		14		5		7
Expected return on plan assets		(128)		(33)		(43)		(21)		(21)		(7)		(9)
Amortization of actuarial loss		37		9		17		8		8		1		3
Amortization of prior service credit		(4)		(2)		(1)		―		―		―		―
Other		2		1		1		―		―		―		―
Net periodic pension costs(a)(b)	$	27	$	6	$	12	$	5	$	6	$	―	$	3

		Three Months Ended March 31, 2013
(in millions)		Duke Energy		Duke Energy Carolinas		Progress Energy		Duke Energy Progress		Duke Energy Florida		Duke Energy Ohio		Duke Energy Indiana
Service cost		$	42	$	12	$	15	$	5	$	8	$	2	$	3
Interest cost on projected benefit obligation			80		20		29		13		13		5		7
Expected return on plan assets			(137)		(37)		(50)		(23)		(22)		(8)		(11)
Amortization of actuarial loss			61		15		25		11		12		3		6
Amortization of prior service credit			(3)		(2)		(1)		―		―		―		―
Other			2		1		1		―		―		―		―
Net periodic pension costs(a)(b)		$	45	$	9	$	19	$	6	$	11	$	2	$	5
(a)	Duke Energy amounts exclude $3 million for each of the three months ended March 31, 2014 and 2013, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
(b)	Duke Energy Ohio amounts exclude $1 million and $2 million for the three months ended March 31, 2014 and 2013, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.

Other Post-Retirement Benefit Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Pension Costs

	Three Months Ended March 31, 2014
(in millions)	Duke Energy		Duke Energy Carolinas		Progress Energy		Duke Energy Progress		Duke Energy Florida		Duke Energy Ohio		Duke Energy Indiana
Service cost	$	2	$	―	$	1	$	―	$	1	$	―	$	―
Interest cost on accumulated post-retirement benefit obligation		12		3		6		3		3		―		1
Expected return on plan assets		(3)		(2)		―		―		―		―		―
Amortization of actuarial loss		10		1		10		7		2		―		―
Amortization of prior service credit		(31)		(3)		(24)		(18)		(5)		―		―
Net periodic other post-retirement benefit costs(a)(b)	$	(10)	$	(1)	$	(7)	$	(8)	$	1	$	―	$	1

		Three Months Ended March 31, 2013
(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	$	6	$	3	$	2	$	―	$	―
Interest cost on accumulated post-retirement benefit obligation			18		3		11		6		4		―		1
Expected return on plan assets			(3)		(3)		―		―		―		―		―
Amortization of actuarial loss (gain)			13		1		14		9		4		―		(1)
Amortization of prior service credit			(3)		(2)		―		―		―		―		―
Net periodic other post-retirement benefit costs(a)(b)		$	32	$	―	$	31	$	18	$	10	$	―	$	―
(a)	Duke Energy amounts exclude $2 million for each of the three months ended March 31, 2014 and 2013, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
(b)	Duke Energy Ohio amounts exclude $1 million for each of the three months ended March 31, 2014 and 2013, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.