Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	$ 1,368		$ 745
Nuclear fuel	2,127		1,213
Equipment	1,448		863
Construction in process	6,655		7,664
Other	3,272		2,476
Capitalized leases	1,844		444
Accumulated amortization on capitalized leases	34		28
Capitalized Interest Costs [Abstract]
Capitalized interest	177		166		167
Duke Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	378		372
Nuclear fuel	1,277		1,213
Equipment	279		248
Construction in process	1,996		3,774
Other	547		498
Capitalized leases	53		53
Accumulated amortization on capitalized leases	3
Capitalized Interest Costs [Abstract]
Capitalized interest	72		78		83
Progress Energy [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	618		595
Nuclear fuel	850		1,161
Equipment	604		553
Construction in process	1,424		2,454
Other	791		753
Capitalized leases	339		211
Accumulated amortization on capitalized leases	49		56
Capitalized Interest Costs [Abstract]
Capitalized interest	41		35		32
Progress Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	380		367
Nuclear fuel	850		862
Equipment	336		318
Construction in process	946		1,294
Other	380		326
Capitalized leases	150		12
Accumulated amortization on capitalized leases			18
Capitalized Interest Costs [Abstract]
Capitalized interest	23		20		19
Progress Energy Florida [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	239		228
Nuclear fuel			299
Equipment	90		82
Construction in process	474		1,155
Other	270		289
Capitalized leases	189		199
Accumulated amortization on capitalized leases	48		38
Capitalized Interest Costs [Abstract]
Capitalized interest	18		15		13
Duke Energy Ohio [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	136		135
Equipment	255		168
Construction in process	204		255
Other	243		257
Capitalized leases	86		82
Accumulated amortization on capitalized leases	12		11
Capitalized Interest Costs [Abstract]
Capitalized interest	15		9		8
Duke Energy Indiana [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	90		88
Equipment	141		134
Construction in process	2,836		2,992
Other	174		170
Capitalized leases	28		33
Accumulated amortization on capitalized leases	5		6
Capitalized Interest Costs [Abstract]
Capitalized interest	39		33		19
Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(29,471)	[1],[2],[3]	(16,550)	[4],[5],[6]
Regulated Operation [Member] | Duke Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(11,437)	[1],[2]	(11,269)	[4],[5]
Regulated Operation [Member] | Progress Energy [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(12,512)	[1],[3]	(12,684)	[4],[6]
Regulated Operation [Member] | Progress Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(8,185)	[1]	(7,991)	[4]
Regulated Operation [Member] | Progress Energy Florida [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(4,072)		(4,474)	[4]
Regulated Operation [Member] | Duke Energy Ohio [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(1,995)	[2]	(1,916)	[5]
Regulated Operation [Member] | Duke Energy Indiana [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(3,692)	[2]	(3,393)	[5]
Unregulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(2,498)	[2],[3]	(2,159)	[5],[6]
Unregulated Operation [Member] | Duke Energy Ohio [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(703)	[2]	(678)	[5]
Electric [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	73,181		38,171
Electric [Member] | Regulated Operation [Member] | Duke Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	29,269		26,307
Electric [Member] | Regulated Operation [Member] | Progress Energy [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	30,250		28,824
Electric [Member] | Regulated Operation [Member] | Progress Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	18,009		16,078
Electric [Member] | Regulated Operation [Member] | Progress Energy Florida [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	12,041		12,546
Electric [Member] | Regulated Operation [Member] | Duke Energy Ohio [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	3,774		3,595
Electric [Member] | Regulated Operation [Member] | Duke Energy Indiana [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	8,622		8,269
Electric [Member] | Unregulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	6,055		5,464
Electric [Member] | Unregulated Operation [Member] | Duke Energy Ohio [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	3,870		3,997
Natural Gas [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	2,026		1,927
Natural Gas [Member] | Regulated Operation [Member] | Duke Energy Ohio [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	2,026		1,927
Other Buildings And Improvements [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	1,319		672
Other Buildings And Improvements [Member] | Regulated Operation [Member] | Duke Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	444		428
Other Buildings And Improvements [Member] | Regulated Operation [Member] | Progress Energy [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	609		473
Other Buildings And Improvements [Member] | Regulated Operation [Member] | Progress Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	283		138
Other Buildings And Improvements [Member] | Regulated Operation [Member] | Progress Energy Florida [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	318		327
Other Buildings And Improvements [Member] | Regulated Operation [Member] | Duke Energy Ohio [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	125		106
Other Buildings And Improvements [Member] | Regulated Operation [Member] | Duke Energy Indiana [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	149		138
Other Buildings And Improvements [Member] | Unregulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	2,940		2,095
Other Buildings And Improvements [Member] | Unregulated Operation [Member] | Duke Energy Ohio [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	191		192
Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	857		578
Nuclear Fuel [Member] | Duke Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	557		578
Nuclear Fuel [Member] | Progress Energy [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	300		394
Nuclear Fuel [Member] | Progress Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	300		322
Nuclear Fuel [Member] | Progress Energy Florida [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation			72
Variable Interest Entity, Primary Beneficiary [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	$ 103		$ 62
Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	1		3
Other, estimated useful life, in years	5		5
Minimum [Member] | Electric [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	2		2
Minimum [Member] | Electric [Member] | Unregulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	2		2
Minimum [Member] | Natural Gas [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	12		12
Minimum [Member] | Other Buildings And Improvements [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	2		9
Minimum [Member] | Other Buildings And Improvements [Member] | Unregulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	9		9
Maximum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	34		33
Other, estimated useful life, in years	60		60
Maximum [Member] | Electric [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	138		138
Maximum [Member] | Electric [Member] | Unregulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	100		100
Maximum [Member] | Natural Gas [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	60		60
Maximum [Member] | Other Buildings And Improvements [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	100		100
Maximum [Member] | Other Buildings And Improvements [Member] | Unregulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	90		44

[1] Includes $857 million, $557 million, $300 million and $300 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Progress Energy Carolinas, respectively.

[2] Includes accumulated amortization of capitalized leases of $34 million, $3 million, $12 million and $5 million at Duke Energy, Duke Energy Carolinas, Duke Energy Ohio and Duke Energy Indiana, respectively.

[3] Includes accumulated depreciation of VIEs of $103 million and an insignificant amount at December 31, 2012 at Duke Energy and Progress Energy, respectively.

[4] Includes $578 million, $578 million, $394 million, $322 million and $72 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy, Progress Energy Carolinas and Progress Energy Florida, respectively.

[5] Includes accumulated amortization of capitalized leases of $28 million, an insignificant amount, $11 million and $6 million at Duke Energy, Duke Energy Carolinas, Duke Energy Ohio, and Duke Energy Indiana, respectively.

[6] Includes accumulated depreciation of VIEs of $62 million and an insignificant amount at December 31, 2011 at Duke Energy and Progress Energy, respectively.