Property, Plant and Equipment (Schedule Of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	$ 1,501	$ 1,391
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	4,184	4,008
Nuclear fuel	3,572	3,194
Equipment	1,941	1,736
Construction in process	6,186	4,485
Total property, plant and equipment	121,397	109,967
Total accumulated depreciation	(39,406)	(36,736)
Generation facilities to be retired, net	529	548
Net property, plant and equipment	82,520	73,779
Capitalized leases	1,355	1,465
Accumulated amortization on capitalized leases	50	57
Capitalized Interest Costs [Abstract]
Capitalized interest	100	98	$ 75
Operating Leases [Abstract]
Accumulated depreciation and amortization	$ 39,406	$ 36,736
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	5 years	5 years
Maximum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	38 years	38 years
Other, estimated useful life, in years	40 years	60 years
Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	$ (1,922)	$ (1,621)
Operating Leases [Abstract]
Accumulated depreciation and amortization	1,922	1,621
Variable Interest Entity, Primary Beneficiary [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total property, plant and equipment	2,591	2,033
Total accumulated depreciation	(411)	(327)
Operating Leases [Abstract]
Accumulated depreciation and amortization	411	327
Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(37,831)	(35,367)
Operating Leases [Abstract]
Accumulated depreciation and amortization	37,831	35,367
Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	$ 89,864	$ 87,593
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	8 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	100 years
Regulated Operation [Member] | Natural Gas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	$ 7,738	$ 2,322
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]
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 1,692	$ 1,480
Regulated Operation [Member] | Other Buildings And Improvements [Member] | Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years	15 years	15 years
Regulated Operation [Member] | Other Buildings And Improvements [Member] | Maximum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years	100 years	100 years
Nonregulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	$ (1,575)	$ (1,369)
Operating Leases [Abstract]
Accumulated depreciation and amortization	1,575	1,369
Nonregulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	$ 4,298	$ 3,348
Nonregulated Operation [Member] | Electric [Member] | Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	5 years	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]
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 421	$ 410
Nonregulated Operation [Member] | Other Buildings And Improvements [Member] | Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years	25 years	25 years
Nonregulated Operation [Member] | Other Buildings And Improvements [Member] | Maximum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years	35 years	35 years
Duke Energy Carolinas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	$ 432	$ 407
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	904	836
Nuclear fuel	2,092	1,827
Equipment	358	368
Construction in process	2,324	1,860
Total property, plant and equipment	41,127	39,398
Total accumulated depreciation	(14,365)	(13,521)
Net property, plant and equipment	26,762	25,877
Capitalized leases	40	40
Accumulated amortization on capitalized leases	9	11
Capitalized Interest Costs [Abstract]
Capitalized interest	38	38	38
Operating Leases [Abstract]
Accumulated depreciation and amortization	14,365	13,521
Duke Energy Carolinas [Member] | Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(1,192)	(976)
Operating Leases [Abstract]
Accumulated depreciation and amortization	1,192	976
Duke Energy Carolinas [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(14,365)	(13,521)
Operating Leases [Abstract]
Accumulated depreciation and amortization	14,365	13,521
Duke Energy Carolinas [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	34,515	33,623
Duke Energy Carolinas [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	502	477
Progress Energy [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	735	719
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	1,206	1,180
Nuclear fuel	1,480	1,367
Equipment	505	530
Construction in process	2,708	1,827
Total property, plant and equipment	44,864	42,666
Total accumulated depreciation	(15,212)	(14,867)
Generation facilities to be retired, net	529	548
Net property, plant and equipment	30,181	28,347
Capitalized leases	288	302
Accumulated amortization on capitalized leases	99	85
Capitalized Interest Costs [Abstract]
Capitalized interest	31	24	11
Operating Leases [Abstract]
Accumulated depreciation and amortization	15,212	14,867
Progress Energy [Member] | Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(730)	(645)
Operating Leases [Abstract]
Accumulated depreciation and amortization	730	645
Progress Energy [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(15,212)	(14,867)
Operating Leases [Abstract]
Accumulated depreciation and amortization	15,212	14,867
Progress Energy [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	37,596	36,422
Progress Energy [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	634	621
Duke Energy Progress [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	393	392
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	863	856
Nuclear fuel	1,480	1,367
Equipment	378	398
Construction in process	1,329	1,118
Total property, plant and equipment	28,419	27,313
Total accumulated depreciation	(10,561)	(10,141)
Generation facilities to be retired, net	529	548
Net property, plant and equipment	18,387	17,720
Capitalized leases	142	144
Accumulated amortization on capitalized leases	9	7
Capitalized Interest Costs [Abstract]
Capitalized interest	17	20	10
Operating Leases [Abstract]
Accumulated depreciation and amortization	10,561	10,141
Duke Energy Progress [Member] | Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(730)	(645)
Operating Leases [Abstract]
Accumulated depreciation and amortization	730	645
Duke Energy Progress [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(10,561)	(10,141)
Operating Leases [Abstract]
Accumulated depreciation and amortization	10,561	10,141
Duke Energy Progress [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	23,683	22,888
Duke Energy Progress [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	293	294
Duke Energy Florida [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	342	327
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	332	319
Equipment	127	132
Construction in process	1,379	709
Total property, plant and equipment	16,434	15,343
Total accumulated depreciation	(4,644)	(4,720)
Net property, plant and equipment	11,790	10,623
Capitalized leases	146	158
Accumulated amortization on capitalized leases	90	78
Capitalized Interest Costs [Abstract]
Capitalized interest	14	4	1
Operating Leases [Abstract]
Accumulated depreciation and amortization	4,644	4,720
Duke Energy Florida [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(4,644)	(4,720)
Operating Leases [Abstract]
Accumulated depreciation and amortization	4,644	4,720
Duke Energy Florida [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	13,913	13,534
Duke Energy Florida [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	341	322
Duke Energy Ohio [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	150	118
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	172	153
Equipment	338	344
Construction in process	206	180
Total property, plant and equipment	8,126	7,750
Total accumulated depreciation	(2,579)	(2,507)
Net property, plant and equipment	5,547	5,243
Capitalized leases	81	96
Accumulated amortization on capitalized leases	19	27
Capitalized Interest Costs [Abstract]
Capitalized interest	8	10	10
Operating Leases [Abstract]
Accumulated depreciation and amortization	2,579	2,507
Duke Energy Ohio [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(2,579)	(2,507)
Operating Leases [Abstract]
Accumulated depreciation and amortization	2,579	2,507
Duke Energy Ohio [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	4,593	4,429
Duke Energy Ohio [Member] | Regulated Operation [Member] | Natural Gas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	2,456	2,322
Duke Energy Ohio [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	211	204
Duke Energy Indiana [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	106	108
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	226	215
Equipment	156	173
Construction in process	396	214
Total property, plant and equipment	14,241	14,007
Total accumulated depreciation	(4,317)	(4,484)
Net property, plant and equipment	9,924	9,523
Capitalized leases	35	39
Accumulated amortization on capitalized leases	8	7
Capitalized Interest Costs [Abstract]
Capitalized interest	7	6	6
Operating Leases [Abstract]
Accumulated depreciation and amortization	4,317	4,484
Duke Energy Indiana [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(4,317)	(4,484)
Operating Leases [Abstract]
Accumulated depreciation and amortization	4,317	4,484
Duke Energy Indiana [Member] | Regulated Operation [Member] | Electric [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	13,160	13,118
Duke Energy Indiana [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	197	179
Commercial Renewables [Member] | Assets Leased to Others [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total accumulated depreciation	(347)
Operating Leases [Abstract]
Contingent lease payments	216	$ 172	$ 164
Renewable energy projects	3,127
Accumulated depreciation and amortization	$ 347