Property, Plant and Equipment (Schedule Of Property, Plant and Equipment) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	$ 1,459	$ 1,481
Nuclear fuel	2,865	2,458
Equipment	1,762	1,557
Construction in process	4,519	3,595
Other	3,497	3,438
Total property, plant and equipment	104,861	103,115
Total accumulated depreciation	(34,824)	(33,625)
Generation Facilities To Be Retired Net	9
Total net property, plant and equipment	70,046	69,490
Capitalized leases	1,548	1,606
Accumulated amortization on capitalized leases	52	40
Capitalized Interest Costs [Abstract]
Capitalized interest	75	89	176
Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	3 years	1 year
Other, estimated useful life, in years	5 years	5 years
Maximum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	34 years	33 years
Other, estimated useful life, in years	80 years	33 years
Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(1,408)	(1,118)
Variable Interest Entity, Primary Beneficiary [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total property, plant and equipment	1,873	1,678
Total accumulated depreciation	(257)	(175)
Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(32,628)	(31,659)
Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	82,206	78,272
Regulated Operation [Member] | Electric [Member] | Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	2 years	2 years
Regulated Operation [Member] | Electric [Member] | Maximum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	138 years	125 years
Regulated Operation [Member] | Natural Gas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	2,230	2,138
Regulated Operation [Member] | Natural Gas [Member] | Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	12 years	12 years
Regulated Operation [Member] | Natural Gas [Member] | Maximum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	67 years	67 years
Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	1,445	1,397
Regulated Operation [Member] | Other Buildings And Improvements [Member] | Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	9 years	2 years
Regulated Operation [Member] | Other Buildings And Improvements [Member] | Maximum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	100 years	100 years
Nonregulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(2,196)	(1,966)
Nonregulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	2,380	6,267
Nonregulated Operation [Member] | Electric [Member] | Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	1 year	2 years
Nonregulated Operation [Member] | Electric [Member] | Maximum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	30 years	100 years
Nonregulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	2,498	2,512
Nonregulated Operation [Member] | Other Buildings And Improvements [Member] | Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	5 years	9 years
Nonregulated Operation [Member] | Other Buildings And Improvements [Member] | Maximum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	50 years	100 years
Duke Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	403	397
Nuclear fuel	1,676	1,446
Equipment	341	287
Construction in process	2,081	1,741
Other	655	570
Total property, plant and equipment	37,372	34,906
Total accumulated depreciation	(12,700)	(11,894)
Total net property, plant and equipment	24,672	23,012
Capitalized leases	40	53
Accumulated amortization on capitalized leases	8	4
Capitalized Interest Costs [Abstract]
Capitalized interest	38	41	72
Duke Energy Carolinas [Member] | Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(847)	(681)
Duke Energy Carolinas [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(12,700)	(11,894)
Duke Energy Carolinas [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	31,751	30,018
Duke Energy Carolinas [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	465	447
Progress Energy [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	704	705
Nuclear fuel	1,190	1,012
Equipment	506	621
Construction in process	1,215	873
Other	756	867
Total property, plant and equipment	38,650	36,480
Total accumulated depreciation	(13,506)	(13,098)
Total net property, plant and equipment	25,144	23,382
Capitalized leases	315	328
Accumulated amortization on capitalized leases	72	60
Capitalized Interest Costs [Abstract]
Capitalized interest	11	19	41
Progress Energy [Member] | Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(561)	(438)
Progress Energy [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(13,506)	(13,098)
Progress Energy [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	33,672	31,792
Progress Energy [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	607	610
Duke Energy Progress [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	380	383
Nuclear fuel	1,190	1,012
Equipment	388	357
Construction in process	908	631
Other	439	418
Total property, plant and equipment	24,207	22,273
Total accumulated depreciation	(9,021)	(8,623)
Total net property, plant and equipment	15,186	13,650
Capitalized leases	146	148
Accumulated amortization on capitalized leases	5
Capitalized Interest Costs [Abstract]
Capitalized interest	10	16	23
Duke Energy Progress [Member] | Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(561)	(438)
Duke Energy Progress [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(9,021)	(8,623)
Duke Energy Progress [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	20,616	19,190
Duke Energy Progress [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	286	282
Duke Energy Florida [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	324	321
Equipment	118	94
Construction in process	307	238
Other	310	294
Total property, plant and equipment	14,433	13,863
Total accumulated depreciation	(4,478)	(4,252)
Total net property, plant and equipment	9,955	9,611
Capitalized leases	169	180
Accumulated amortization on capitalized leases	67	57
Capitalized Interest Costs [Abstract]
Capitalized interest	1	3	18
Duke Energy Florida [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(4,478)	(4,252)
Duke Energy Florida [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	13,056	12,601
Duke Energy Florida [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	318	315
Duke Energy Ohio [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	114	137
Equipment	330	317
Construction in process	97	166
Other	214	248
Total property, plant and equipment	7,141	11,143
Total accumulated depreciation	(2,213)	(2,908)
Generation Facilities To Be Retired Net	9
Total net property, plant and equipment	4,937	8,235
Capitalized leases	98	96
Accumulated amortization on capitalized leases	25	21
Capitalized Interest Costs [Abstract]
Capitalized interest	10	11	13
Duke Energy Ohio [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(2,213)	(2,160)
Duke Energy Ohio [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	3,956	3,925
Duke Energy Ohio [Member] | Regulated Operation [Member] | Natural Gas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	2,230	2,138
Duke Energy Ohio [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	200	190
Duke Energy Ohio [Member] | Nonregulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation		(748)
Duke Energy Ohio [Member] | Nonregulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution		4,017
Duke Energy Ohio [Member] | Nonregulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution		5
Duke Energy Indiana [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	108	105
Equipment	166	146
Construction in process	481	307
Other	195	178
Total property, plant and equipment	13,034	12,489
Total accumulated depreciation	(4,219)	(3,913)
Total net property, plant and equipment	8,815	8,576
Capitalized leases	30	30
Accumulated amortization on capitalized leases	6	5
Capitalized Interest Costs [Abstract]
Capitalized interest	6	9	39
Duke Energy Indiana [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(4,219)	(3,913)
Duke Energy Indiana [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	11,911	11,594
Duke Energy Indiana [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	$ 173	$ 159