Commitments And Contingencies (Future Minimum Payments For Operating And Capital Leases) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Leased Assets
Rental expense on operating leases	$ 232	$ 104	$ 122
Operating Leases, Future Minimum Payments Due [Abstract]
2013	171
2014	156
2015	139
2016	127
2017	108
Thereafter	981
Total future minimum lease payments	1,682
Capital Leases, Future Minimum Payments Due [Abstract]
2013	210
2014	180
2015	181
2016	183
2017	180
Thereafter	1,779
Minimum annual payments	2,713
Less amount representing interest	(1,024)
Total	1,689
Duke Energy Carolinas [Member]
Operating Leased Assets
Rental expense on operating leases	38	43	60
Operating Leases, Future Minimum Payments Due [Abstract]
2013	35
2014	28
2015	21
2016	16
2017	14
Thereafter	77
Total future minimum lease payments	191
Capital Leases, Future Minimum Payments Due [Abstract]
2013	7
2014	7
2015	7
2016	8
2017	8
Thereafter	65
Minimum annual payments	102
Less amount representing interest	(70)
Total	32
Progress Energy [Member]
Operating Leased Assets
Rental expense on operating leases	232	104	100
Operating Leases, Future Minimum Payments Due [Abstract]
2013	91
2014	88
2015	86
2016	85
2017	71
Thereafter	721
Total future minimum lease payments	1,142
Capital Leases, Future Minimum Payments Due [Abstract]
2013	47
2014	46
2015	46
2016	45
2017	45
Thereafter	579
Minimum annual payments	808
Less amount representing interest	(469)
Total	339
Progress Energy Carolinas [Member]
Operating Leased Assets
Rental expense on operating leases	164	88	63
Operating Leases, Future Minimum Payments Due [Abstract]
2013	47
2014	46
2015	46
2016	46
2017	35
Thereafter	431
Total future minimum lease payments	651
Capital Leases, Future Minimum Payments Due [Abstract]
2013	21
2014	20
2015	20
2016	19
2017	20
Thereafter	325
Minimum annual payments	425
Less amount representing interest	(275)
Total	150
Progress Energy Florida [Member]
Operating Leased Assets
Rental expense on operating leases	68	15	37
Operating Leases, Future Minimum Payments Due [Abstract]
2013	38
2014	37
2015	37
2016	36
2017	36
Thereafter	290
Total future minimum lease payments	474
Capital Leases, Future Minimum Payments Due [Abstract]
2013	26
2014	26
2015	26
2016	26
2017	25
Thereafter	254
Minimum annual payments	383
Less amount representing interest	(194)
Total	189
Duke Energy Ohio [Member]
Operating Leased Assets
Rental expense on operating leases	14	19	19
Operating Leases, Future Minimum Payments Due [Abstract]
2013	11
2014	10
2015	8
2016	7
2017	6
Thereafter	24
Total future minimum lease payments	66
Capital Leases, Future Minimum Payments Due [Abstract]
2013	10
2014	9
2015	7
2016	6
2017	3
Thereafter	5
Minimum annual payments	40
Less amount representing interest	(5)
Total	35
Duke Energy Indiana [Member]
Operating Leased Assets
Rental expense on operating leases	20	24	24
Operating Leases, Future Minimum Payments Due [Abstract]
2013	19
2014	15
2015	12
2016	9
2017	6
Thereafter	7
Total future minimum lease payments	68
Capital Leases, Future Minimum Payments Due [Abstract]
2013	5
2014	5
2015	4
2016	4
2017	1
Thereafter	35
Minimum annual payments	54
Less amount representing interest	(31)
Total	$ 23