Property, Plant and Equipment (Schedule Of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	$ 2,091	$ 2,072
Other buildings and improvements	4,916	4,675
Equipment	2,313	2,141
Construction in process	6,102	5,726
Total property, plant and equipment	147,654	134,458
Generation facilities to be retired, net	246	362
Total net property, plant and equipment	102,127	91,694
Finance lease asset	952
Finance lease accumulated amortization	(6)
Capitalized leases		1,237
Accumulated amortization on capitalized leases		61
Capitalized Interest Costs [Abstract]
Capitalized interest	$ 159	$ 161	$ 128
Minimum
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years	2 years	3 years
Equipment, estimated useful life, years	3 years	3 years
Maximum
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years	40 years	40 years
Equipment, estimated useful life, years	25 years	55 years
Nuclear fuel
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel	$ 3,253	$ 3,460
Accumulated depreciation and amortization	(1,807)	(1,947)
VIE
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total property, plant and equipment	5,747	4,007
Accumulated depreciation and amortization	(1,041)	(698)
Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(43,419)	(41,079)
Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	$ 111,739	$ 100,706
Regulated | Electric generation, distribution and transmission | Minimum
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	15 years	15 years
Regulated | Electric generation, distribution and transmission | Maximum
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	100 years	100 years
Regulated | Natural gas transmission and distribution
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	$ 9,839	$ 8,808
Regulated | Natural gas transmission and distribution | Minimum
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	4 years	12 years
Regulated | Natural gas transmission and distribution | Maximum
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	73 years	80 years
Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	$ 1,810	$ 1,966
Regulated | Other buildings and improvements | Minimum
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years	23 years	24 years
Regulated | Other buildings and improvements | Maximum
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years	90 years	90 years
Nonregulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	$ (2,354)	$ (2,047)
Finance lease accumulated amortization	(20)
Nonregulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	$ 5,103	$ 4,410
Nonregulated | Electric generation, distribution and transmission | Minimum
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	5 years	5 years
Nonregulated | Electric generation, distribution and transmission | Maximum
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution, estimated useful life, in years	30 years	30 years
Nonregulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	$ 488	$ 494
Nonregulated | Other buildings and improvements | Minimum
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years	25 years	25 years
Nonregulated | Other buildings and improvements | Maximum
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other, estimated useful life, in years	35 years	35 years
Duke Energy Carolinas
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	$ 520	$ 472
Other buildings and improvements	1,139	1,077
Equipment	546	467
Construction in process	1,389	1,678
Total property, plant and equipment	48,922	44,741
Total net property, plant and equipment	32,397	29,245
Finance lease asset	211
Finance lease accumulated amortization	(13)
Capitalized leases		135
Accumulated amortization on capitalized leases		12
Capitalized Interest Costs [Abstract]
Capitalized interest	30	35	45
Duke Energy Carolinas | Nuclear fuel
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel	1,891	1,898
Accumulated depreciation and amortization	(1,082)	(1,087)
Duke Energy Carolinas | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(16,525)	(15,496)
Duke Energy Carolinas | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	42,723	38,468
Duke Energy Carolinas | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	714	681
Progress Energy
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	884	868
Other buildings and improvements	1,467	1,354
Equipment	665	565
Construction in process	2,149	2,515
Total property, plant and equipment	55,070	50,260
Generation facilities to be retired, net	246	362
Total net property, plant and equipment	38,157	34,224
Finance lease asset	443
Finance lease accumulated amortization	(143)
Capitalized leases		257
Accumulated amortization on capitalized leases		131
Capitalized Interest Costs [Abstract]
Capitalized interest	31	51	45
Progress Energy | Nuclear fuel
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel	1,362	1,562
Accumulated depreciation and amortization	(725)	(860)
Progress Energy | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(17,159)	(16,398)
Progress Energy | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	48,142	42,760
Progress Energy | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	401	636
Duke Energy Progress
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	449	445
Other buildings and improvements	1,046	952
Equipment	452	399
Construction in process	1,114	1,659
Total property, plant and equipment	34,603	31,459
Generation facilities to be retired, net	246	362
Total net property, plant and equipment	22,934	20,398
Finance lease asset	308
Finance lease accumulated amortization	(17)
Capitalized leases		137
Accumulated amortization on capitalized leases		14
Capitalized Interest Costs [Abstract]
Capitalized interest	28	26	21
Duke Energy Progress | Nuclear fuel
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel	1,362	1,562
Accumulated depreciation and amortization	(725)	(860)
Duke Energy Progress | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(11,915)	(11,423)
Duke Energy Progress | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	30,018	26,147
Duke Energy Progress | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	162	295
Duke Energy Florida
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	435	423
Other buildings and improvements	411	393
Equipment	213	166
Construction in process	1,035	856
Total property, plant and equipment	20,457	18,792
Total net property, plant and equipment	15,221	13,824
Finance lease asset	135
Finance lease accumulated amortization	(126)
Capitalized leases		120
Accumulated amortization on capitalized leases		117
Capitalized Interest Costs [Abstract]
Capitalized interest	3	25	24
Duke Energy Florida | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(5,236)	(4,968)
Duke Energy Florida | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	18,124	16,613
Duke Energy Florida | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	239	341
Duke Energy Ohio
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	150	136
Other buildings and improvements	269	257
Equipment	319	384
Construction in process	504	412
Total property, plant and equipment	10,241	9,360
Total net property, plant and equipment	7,398	6,643
Capitalized leases		73
Accumulated amortization on capitalized leases		20
Capitalized Interest Costs [Abstract]
Capitalized interest	22	17	10
Duke Energy Ohio | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(2,843)	(2,717)
Duke Energy Ohio | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	5,838	5,182
Duke Energy Ohio | Regulated | Natural gas transmission and distribution
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	2,892	2,719
Duke Energy Ohio | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	269	270
Duke Energy Indiana
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	117	116
Other buildings and improvements	292	279
Equipment	205	178
Construction in process	381	325
Total property, plant and equipment	16,305	15,443
Total net property, plant and equipment	11,072	10,529
Finance lease asset	10
Finance lease accumulated amortization	(3)
Capitalized leases		35
Accumulated amortization on capitalized leases		10
Capitalized Interest Costs [Abstract]
Capitalized interest	26	27	9
Duke Energy Indiana | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(5,233)	(4,914)
Duke Energy Indiana | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	15,032	14,292
Duke Energy Indiana | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	278	253
Piedmont
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	388	448
Other buildings and improvements	304	300
Equipment	128	141
Construction in process	531	382
Total property, plant and equipment	8,446	7,486
Total net property, plant and equipment	6,765	5,911
Capitalized Interest Costs [Abstract]
Capitalized interest	26	17	$ 12
Piedmont | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(1,681)	(1,575)
Piedmont | Regulated | Natural gas transmission and distribution
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	6,947	6,089
Piedmont | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	$ 148	$ 126