Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2013

Mar. 31, 2012

Defined Benefit Plan Disclosure [Line Items]

Employee Savings Plan 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,
	2013	$	41	$	14	$	12	$	6	$	4	$	1	$	2
	2012		28		11		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, 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 project benefit obligation		80		20		29		13		13		5		7
Expected return on plan assets		(137)		(37)		(50)		(23)		(22)		(8)		(11)
Amortization of prior service credit		(3)		(2)		(1)		-		-		-		-
Amortization of actuarial loss		61		15		25		11		12		3		6
Other		2		1		1		-		-		-		-
Net periodic pension costs(a)(b)	$	45	$	9	$	19	$	6	$	11	$	2	$	5

	Three Months Ended March 31, 2012
(in millions)	Duke Energy		Duke Energy Carolinas		Progress Energy		Duke Energy Progress		Duke Energy Florida		Duke Energy Ohio		Duke Energy Indiana
Service cost	$	23	$	9	$	15	$	6	$	7	$	2	$	2
Interest cost on project benefit obligation		61		23		31		14		13		8		8
Expected return on plan assets		(94)		(36)		(46)		(24)		(20)		(11)		(12)
Amortization of prior service cost		1		-		2		2		-		-		1
Amortization of actuarial loss		24		11		22		9		11		2		3
Other		1		-		-		-		-		-		-
Net periodic pension costs(a)(b)	$	16	$	7	$	24	$	7	$	11	$	1	$	2

Other Post-Retirement Benefit plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Components Of net periodic pension costs

	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 prior service credit		(3)		(2)		-		-		-		-		-
Amortization of actuarial loss (gain)		13		1		14		9		4		-		(1)
Net periodic costs(a)(b)	$	32	$	-	$	31	$	18	$	10	$	-	$	-

	Three Months Ended March 31, 2012
(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	$	3	$	1	$	1	$	-	$	-
Interest cost on accumulated post-retirement benefit obligation		8		4		10		5		4		1		2
Expected return on plan assets		(4)		(3)		-		-		-		-		-
Amortization of prior service credit		(2)		(1)		-		-		-		-		-
Amortization of net transition liability		2		1		1		-		1		-		-
Amortization of actuarial (gain) loss		(2)		1		6		3		3		(1)		-
Net periodic costs(a)(b)	$	4	$	3	$	20	$	9	$	9	$	-	$	2