Property, Plant and Equipment (Schedule Of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 31, 2016
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land		$ 2,072	$ 1,559
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment		4,675	4,498
Equipment		2,141	2,122
Construction in process		5,726	6,995
Total property, plant and equipment		134,458	127,507
Generation facilities to be retired, net		362	421
Total net property, plant and equipment		91,694	86,391
Asset Impairment Charges		402	282	$ 18
Capitalized leases		1,237	1,294
Accumulated amortization on capitalized leases		(61)	(57)
Capitalized Interest Costs [Abstract]
Capitalized interest		$ 161	$ 128	100
Commercial Renewables [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Asset Impairment Charges				71
Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years		3 years	3 years
Equipment, estimated useful life, years		3 years	3 years
Maximum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years		40 years	40 years
Equipment, estimated useful life, years		55 years	55 years
Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel		$ 3,460	$ 3,680
Accumulated depreciation and amortization		(1,947)	(2,113)
Variable Interest Entity, Primary Beneficiary [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total property, plant and equipment		4,007	3,941
Accumulated depreciation and amortization		(698)	(598)
Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization		(41,079)	(39,742)
Regulated Operation [Member] | Electric Plant [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution		$ 100,706	$ 93,687
Regulated Operation [Member] | Electric Plant [Member] | Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years		15 years	8 years
Regulated Operation [Member] | Electric Plant [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		$ 8,808	$ 8,292
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		80 years	80 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		$ 1,966	$ 1,936
Regulated Operation [Member] | Other Buildings And Improvements [Member] | Minimum [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years		24 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		90 years	100 years
Nonregulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization		$ (2,047)	$ (1,795)
Nonregulated Operation [Member] | Electric Plant [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution		$ 4,410	$ 4,273
Nonregulated Operation [Member] | Electric Plant [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] | Electric Plant [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		$ 494	$ 465
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		$ 472	$ 467
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment		1,077	1,032
Equipment		467	402
Construction in process		1,678	2,614
Total property, plant and equipment		44,741	42,939
Total net property, plant and equipment		29,245	27,876
Asset Impairment Charges		192		1
Capitalized leases		135	81
Accumulated amortization on capitalized leases		(12)	(11)
Capitalized Interest Costs [Abstract]
Capitalized interest		35	45	38
Duke Energy Carolinas [Member] | Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel		1,898	2,120
Accumulated depreciation and amortization		(1,087)	(1,283)
Duke Energy Carolinas [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization		(15,496)	(15,063)
Duke Energy Carolinas [Member] | Regulated Operation [Member] | Electric Plant [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution		38,468	35,657
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		681	647
Progress Energy [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land		868	767
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment		1,354	1,311
Equipment		565	555
Construction in process		2,515	3,059
Total property, plant and equipment		50,260	47,323
Generation facilities to be retired, net		362	421
Total net property, plant and equipment		34,224	31,887
Asset Impairment Charges		87	156	7
Capitalized leases net of accumulated amortization		257	272
Accumulated amortization on capitalized leases		(131)	(114)
Capitalized Interest Costs [Abstract]
Capitalized interest		51	45	31
Progress Energy [Member] | Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel		1,562	1,560
Accumulated depreciation and amortization		(860)	(831)
Progress Energy [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization		(16,398)	(15,857)
Progress Energy [Member] | Regulated Operation [Member] | Electric Plant [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution		42,760	39,419
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		636	652
Duke Energy Progress [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land		445	424
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment		952	931
Equipment		399	416
Construction in process		1,659	1,434
Total property, plant and equipment		31,459	29,583
Generation facilities to be retired, net		362	421
Total net property, plant and equipment		20,398	19,101
Asset Impairment Charges		33	19	1
Capitalized leases net of accumulated amortization		137	139
Accumulated amortization on capitalized leases		(14)	(11)
Capitalized Interest Costs [Abstract]
Capitalized interest		26	21	17
Duke Energy Progress [Member] | Nuclear Fuel [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel		1,562	1,560
Accumulated depreciation and amortization		(860)	(831)
Duke Energy Progress [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization		(11,423)	(10,903)
Duke Energy Progress [Member] | Regulated Operation [Member] | Electric Plant [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution		26,147	24,502
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		295	316
Duke Energy Florida [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land		423	343
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment		393	370
Equipment		166	139
Construction in process		856	1,625
Total property, plant and equipment		18,792	17,730
Total net property, plant and equipment		13,824	12,783
Asset Impairment Charges		54	138	6
Capitalized leases net of accumulated amortization		120	133
Accumulated amortization on capitalized leases		(117)	(103)
Capitalized Interest Costs [Abstract]
Capitalized interest		25	24	14
Duke Energy Florida [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization		(4,968)	(4,947)
Duke Energy Florida [Member] | Regulated Operation [Member] | Electric Plant [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution		16,613	14,917
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	336
Duke Energy Ohio [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land		136	134
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment		257	228
Equipment		384	348
Construction in process		412	350
Total property, plant and equipment		9,360	8,732
Total net property, plant and equipment		6,643	6,041
Asset Impairment Charges			1
Capitalized leases		73	80
Accumulated amortization on capitalized leases		(20)	(21)
Capitalized Interest Costs [Abstract]
Capitalized interest		17	10	8
Duke Energy Ohio [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization		(2,717)	(2,691)
Duke Energy Ohio [Member] | Regulated Operation [Member] | Electric Plant [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution		5,182	4,870
Duke Energy Ohio [Member] | Regulated Operation [Member] | Natural Gas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution		2,719	2,559
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		270	243
Duke Energy Indiana [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land		116	111
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment		279	271
Equipment		178	169
Construction in process		325	416
Total property, plant and equipment		15,443	14,948
Total net property, plant and equipment		10,529	10,286
Asset Impairment Charges		30	18	8
Capitalized leases		35	35
Accumulated amortization on capitalized leases		(10)	(9)
Capitalized Interest Costs [Abstract]
Capitalized interest		27	9	7
Duke Energy Indiana [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization		(4,914)	(4,662)
Duke Energy Indiana [Member] | Regulated Operation [Member] | Electric Plant [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution		14,292	13,741
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		253	240
Piedmont Natural Gas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land		448	41
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment		300	300
Equipment		141	266
Construction in process		382	231
Total property, plant and equipment		7,486	6,725
Total net property, plant and equipment		5,911	5,246
Asset Impairment Charges			7
Capitalized Interest Costs [Abstract]
Capitalized interest	$ 12	17		$ 12	$ 2
Piedmont Natural Gas [Member] | Regulated Operation [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization		(1,575)	(1,479)
Piedmont Natural Gas [Member] | Regulated Operation [Member] | Natural Gas [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution		6,089	5,733
Piedmont Natural Gas [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		$ 126	154
Property, Plant and Equipment [Member] | Commercial Renewables [Member]
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Asset Impairment Charges			$ 58