Property, Plant and Equipment (Schedule Of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	$ 1,466	$ 1,459
Nuclear fuel	3,194	2,865
Equipment	1,791	1,762
Construction in process	4,525	4,519
Other	4,744	3,497
Total property, plant and equipment	112,826	104,861
Total accumulated depreciation	(37,665)	(34,824)
Generation Facilities To Be Retired Net	548	9
Total net property, plant and equipment	75,709	70,046
Capitalized leases	1,470	1,548
Accumulated amortization on capitalized leases	58	52
Capitalized Interest Costs [Abstract]
Capitalized interest	98	75	$ 89
Operating Leases [Abstract]
Accumulated depreciation and amortization	$ (37,665)	$ (34,824)
Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	3 years	3 years
Other, estimated useful life, in years	2 years	5 years
Maximum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	38 years	34 years
Other, estimated useful life, in years	60 years	80 years
Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	$ (1,621)	$ (1,408)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(1,621)	(1,408)
Variable Interest Entity, Primary Beneficiary [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total property, plant and equipment	2,033	1,873
Total accumulated depreciation	(327)	(257)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(327)	(257)
Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(35,367)	(32,628)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(35,367)	(32,628)
Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	$ 87,593	$ 82,206
Regulated Operation [Member] | Electric [Member] | Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	8 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	100 years	138 years
Regulated Operation [Member] | Natural Gas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	$ 2,322	$ 2,230
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	$ 1,480	$ 1,445
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	15 years	9 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	$ (2,298)	$ (2,196)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(2,298)	(2,196)
Nonregulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	$ 3,348	$ 2,380
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	1 year
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	30 years
Nonregulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	$ 2,363	$ 2,498
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	5 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	50 years
Duke Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	$ 407	$ 403
Nuclear fuel	1,827	1,676
Equipment	368	341
Construction in process	1,860	2,081
Other	836	655
Total property, plant and equipment	39,398	37,372
Total accumulated depreciation	(13,521)	(12,700)
Total net property, plant and equipment	25,877	24,672
Capitalized leases	40	40
Accumulated amortization on capitalized leases	11	8
Capitalized Interest Costs [Abstract]
Capitalized interest	38	38	41
Operating Leases [Abstract]
Accumulated depreciation and amortization	(13,521)	(12,700)
Duke Energy Carolinas [Member] | Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(976)	(847)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(976)	(847)
Duke Energy Carolinas [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(13,521)	(12,700)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(13,521)	(12,700)
Duke Energy Carolinas [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	33,623	31,751
Duke Energy Carolinas [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	477	465
Progress Energy [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	719	704
Nuclear fuel	1,367	1,190
Equipment	530	506
Construction in process	1,827	1,215
Other	1,180	756
Total property, plant and equipment	42,666	38,650
Total accumulated depreciation	(14,867)	(13,506)
Generation Facilities To Be Retired Net	548
Total net property, plant and equipment	28,347	25,144
Capitalized leases	302	315
Accumulated amortization on capitalized leases	85	72
Capitalized Interest Costs [Abstract]
Capitalized interest	24	11	19
Operating Leases [Abstract]
Accumulated depreciation and amortization	(14,867)	(13,506)
Progress Energy [Member] | Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(645)	(561)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(645)	(561)
Progress Energy [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(14,867)	(13,506)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(14,867)	(13,506)
Progress Energy [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	36,422	33,672
Progress Energy [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	621	607
Duke Energy Progress [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	392	380
Nuclear fuel	1,367	1,190
Equipment	398	388
Construction in process	1,118	908
Other	856	439
Total property, plant and equipment	27,313	24,207
Total accumulated depreciation	(10,141)	(9,021)
Generation Facilities To Be Retired Net	548
Total net property, plant and equipment	17,720	15,186
Capitalized leases	144	146
Accumulated amortization on capitalized leases	7	5
Capitalized Interest Costs [Abstract]
Capitalized interest	20	10	16
Operating Leases [Abstract]
Accumulated depreciation and amortization	(10,141)	(9,021)
Duke Energy Progress [Member] | Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(645)	(561)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(645)	(561)
Duke Energy Progress [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(10,141)	(9,021)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(10,141)	(9,021)
Duke Energy Progress [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	22,888	20,616
Duke Energy Progress [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	294	286
Duke Energy Florida [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	327	324
Equipment	132	118
Construction in process	709	307
Other	319	310
Total property, plant and equipment	15,343	14,433
Total accumulated depreciation	(4,720)	(4,478)
Total net property, plant and equipment	10,623	9,955
Capitalized leases	158	169
Accumulated amortization on capitalized leases	78	67
Capitalized Interest Costs [Abstract]
Capitalized interest	4	1	3
Operating Leases [Abstract]
Accumulated depreciation and amortization	(4,720)	(4,478)
Duke Energy Florida [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(4,720)	(4,478)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(4,720)	(4,478)
Duke Energy Florida [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	13,534	13,056
Duke Energy Florida [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	322	318
Duke Energy Ohio [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	118	114
Equipment	344	330
Construction in process	180	97
Other	153	214
Total property, plant and equipment	7,750	7,141
Total accumulated depreciation	(2,507)	(2,213)
Generation Facilities To Be Retired Net		9
Total net property, plant and equipment	5,243	4,937
Capitalized leases	96	98
Accumulated amortization on capitalized leases	27	25
Capitalized Interest Costs [Abstract]
Capitalized interest	10	10	11
Operating Leases [Abstract]
Accumulated depreciation and amortization	(2,507)	(2,213)
Duke Energy Ohio [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(2,507)	(2,213)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(2,507)	(2,213)
Duke Energy Ohio [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	4,429	3,956
Duke Energy Ohio [Member] | Regulated Operation [Member] | Natural Gas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	2,322	2,230
Duke Energy Ohio [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	204	200
Duke Energy Indiana [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	108	108
Equipment	173	166
Construction in process	214	481
Other	215	195
Total property, plant and equipment	14,007	13,034
Total accumulated depreciation	(4,484)	(4,219)
Total net property, plant and equipment	9,523	8,815
Capitalized leases	39	30
Accumulated amortization on capitalized leases	7	6
Capitalized Interest Costs [Abstract]
Capitalized interest	6	6	9
Operating Leases [Abstract]
Accumulated depreciation and amortization	(4,484)	(4,219)
Duke Energy Indiana [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(4,484)	(4,219)
Operating Leases [Abstract]
Accumulated depreciation and amortization	(4,484)	(4,219)
Duke Energy Indiana [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	13,118	11,911
Duke Energy Indiana [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	179	173
Commercial Portfolio [Member] | Assets Leased to Others [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(258)
Operating Leases [Abstract]
Contingent lease payments	172	$ 164	$ 154
Renewable energy projects	2,455
Accumulated depreciation and amortization	$ (258)