Commitments and Contingencies (Future Minimum Payments for Operating and Capital Leases) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Leased Assets
Rental expense on operating leases	$ 321	$ 232	$ 104
Operating Leases, Future Minimum Payments Due [Abstract]
2014	175
2015	159
2016	147
2017	137
2018	117
Thereafter	1,034
Total future minimum lease payments	1,769
Capital Leases, Future Minimum Payments Due [Abstract]
2014	171
2015	167
2016	169
2017	166
2018	176
Thereafter	1,453
Minimum annual payments	2,302
Less amount representing interest	(786)
Total	1,516
Duke Energy Carolinas [Member]
Operating Leased Assets
Rental expense on operating leases	39	38	43
Operating Leases, Future Minimum Payments Due [Abstract]
2014	34
2015	29
2016	24
2017	20
2018	15
Thereafter	67
Total future minimum lease payments	189
Capital Leases, Future Minimum Payments Due [Abstract]
2014	6
2015	6
2016	6
2017	6
2018	6
Thereafter	25
Minimum annual payments	55
Less amount representing interest	(27)
Total	28
Progress Energy [Member]
Operating Leased Assets
Rental expense on operating leases	225	232	104
Operating Leases, Future Minimum Payments Due [Abstract]
2014	93
2015	89
2016	90
2017	89
2018	78
Thereafter	773
Total future minimum lease payments	1,212
Capital Leases, Future Minimum Payments Due [Abstract]
2014	47
2015	47
2016	47
2017	46
2018	45
Thereafter	475
Minimum annual payments	707
Less amount representing interest	(454)
Total	253
Duke Energy Progress [Member]
Operating Leased Assets
Rental expense on operating leases	153	164	88
Operating Leases, Future Minimum Payments Due [Abstract]
2014	55
2015	51
2016	51
2017	50
2018	40
Thereafter	459
Total future minimum lease payments	706
Capital Leases, Future Minimum Payments Due [Abstract]
2014	20
2015	20
2016	21
2017	21
2018	21
Thereafter	261
Minimum annual payments	364
Less amount representing interest	(275)
Total	89
Duke Energy Florida [Member]
Operating Leased Assets
Rental expense on operating leases	72	68	15
Operating Leases, Future Minimum Payments Due [Abstract]
2014	39
2015	39
2016	39
2017	39
2018	38
Thereafter	314
Total future minimum lease payments	508
Capital Leases, Future Minimum Payments Due [Abstract]
2014	26
2015	27
2016	26
2017	26
2018	25
Thereafter	213
Minimum annual payments	343
Less amount representing interest	(179)
Total	164
Duke Energy Ohio [Member]
Operating Leased Assets
Rental expense on operating leases	14	14	19
Operating Leases, Future Minimum Payments Due [Abstract]
2014	12
2015	11
2016	8
2017	7
2018	5
Thereafter	18
Total future minimum lease payments	61
Capital Leases, Future Minimum Payments Due [Abstract]
2014	9
2015	7
2016	6
2017	3
2018	3
Thereafter	2
Minimum annual payments	30
Less amount representing interest	(3)
Total	27
Duke Energy Indiana [Member]
Operating Leased Assets
Rental expense on operating leases	22	20	24
Operating Leases, Future Minimum Payments Due [Abstract]
2014	18
2015	15
2016	12
2017	9
2018	7
Thereafter	8
Total future minimum lease payments	69
Capital Leases, Future Minimum Payments Due [Abstract]
2014	5
2015	4
2016	4
2017	2
2018	2
Thereafter	28
Minimum annual payments	45
Less amount representing interest	(30)
Total	$ 15