Property, Plant and Equipment (Schedule Of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	15 years	13 years
Land	$ 2,046	$ 2,091
Other buildings and improvements	5,090	4,916
Equipment	2,608	2,313
Construction in process	6,645	6,102
Total property, plant and equipment	155,580	147,654
Generation facilities to be retired, net	29	246
Total net property, plant and equipment	$ 106,782	$ 102,127
Other, estimated useful life, in years	14 years	13 years
Finance leases, gross	$ 832	$ 952
Net property, plant and equipment	797	926
Accumulated amortization of finance leases	12	6
Capitalized Interest Costs [Abstract]
Capitalized interest	112	159	$ 161
Nuclear fuel
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel	3,284	3,253
Accumulated depreciation and amortization	(1,832)	(1,807)
Consolidated VIEs
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total property, plant and equipment	6,394	5,747
Accumulated depreciation and amortization	(1,242)	(1,041)
Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	$ (46,216)	$ (43,419)
Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	39 years	39 years
Plant - transmission and distribution	$ 117,107	$ 111,739
Regulated | Natural gas transmission and distribution
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	54 years	54 years
Plant - transmission and distribution	$ 10,799	$ 9,839
Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	36 years	32 years
Other buildings and improvements	$ 2,038	$ 1,810
Nonregulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(2,611)	(2,354)
Accumulated amortization of finance leases	$ 23	$ 20
Nonregulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	27 years	28 years
Plant - transmission and distribution	$ 5,444	$ 5,103
Nonregulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	10 years	9 years
Other buildings and improvements	$ 519	$ 488
Duke Energy Carolinas
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	536	520
Other buildings and improvements	1,203	1,139
Equipment	620	546
Construction in process	1,645	1,389
Total property, plant and equipment	50,640	48,922
Total net property, plant and equipment	33,187	32,397
Finance leases, gross	335	211
Net property, plant and equipment	312	198
Accumulated amortization of finance leases	23	13
Capitalized Interest Costs [Abstract]
Capitalized interest	28	30	35
Duke Energy Carolinas | Nuclear fuel
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel	1,837	1,891
Accumulated depreciation and amortization	(1,010)	(1,082)
Duke Energy Carolinas | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(17,453)	(16,525)
Duke Energy Carolinas | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	44,059	42,723
Duke Energy Carolinas | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	740	714
Progress Energy
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	908	884
Other buildings and improvements	1,521	1,467
Equipment	759	665
Construction in process	2,013	2,149
Total property, plant and equipment	57,892	55,070
Generation facilities to be retired, net	29	246
Total net property, plant and equipment	39,553	38,157
Net property, plant and equipment	416	443
Accumulated amortization of finance leases	141	143
Capitalized Interest Costs [Abstract]
Capitalized interest	17	31	51
Progress Energy | Nuclear fuel
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel	1,447	1,362
Accumulated depreciation and amortization	(822)	(725)
Progress Energy | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(18,368)	(17,159)
Progress Energy | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	50,785	48,142
Progress Energy | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	459	401
Duke Energy Progress
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	463	449
Other buildings and improvements	1,070	1,046
Equipment	498	452
Construction in process	709	1,114
Total property, plant and equipment	35,759	34,603
Generation facilities to be retired, net	29	246
Total net property, plant and equipment	22,987	22,934
Net property, plant and equipment	297	308
Accumulated amortization of finance leases	24	17
Capitalized Interest Costs [Abstract]
Capitalized interest	12	28	26
Duke Energy Progress | Nuclear fuel
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel	1,447	1,362
Accumulated depreciation and amortization	(822)	(725)
Duke Energy Progress | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(12,801)	(11,915)
Duke Energy Progress | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	31,375	30,018
Duke Energy Progress | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	197	162
Duke Energy Florida
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	445	435
Other buildings and improvements	441	411
Equipment	261	213
Construction in process	1,304	1,035
Total property, plant and equipment	22,123	20,457
Total net property, plant and equipment	16,563	15,221
Net property, plant and equipment	119	135
Accumulated amortization of finance leases	117	126
Capitalized Interest Costs [Abstract]
Capitalized interest	5	3	25
Duke Energy Florida | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(5,560)	(5,236)
Duke Energy Florida | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	19,410	18,124
Duke Energy Florida | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	262	239
Duke Energy Ohio
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	171	150
Other buildings and improvements	294	269
Equipment	385	319
Construction in process	407	504
Total property, plant and equipment	11,022	10,241
Total net property, plant and equipment	8,009	7,398
Capitalized Interest Costs [Abstract]
Capitalized interest	26	22	17
Duke Energy Ohio | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(3,013)	(2,843)
Duke Energy Ohio | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	6,255	5,838
Duke Energy Ohio | Regulated | Natural gas transmission and distribution
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	3,136	2,892
Duke Energy Ohio | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	374	269
Duke Energy Indiana
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	118	117
Other buildings and improvements	309	292
Equipment	238	205
Construction in process	409	381
Total property, plant and equipment	17,382	16,305
Total net property, plant and equipment	11,721	11,072
Finance leases, gross	10	10
Net property, plant and equipment	7	7
Accumulated amortization of finance leases	3	3
Capitalized Interest Costs [Abstract]
Capitalized interest	10	26	27
Duke Energy Indiana | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(5,661)	(5,233)
Duke Energy Indiana | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	16,008	15,032
Duke Energy Indiana | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	300	278
Piedmont
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	279	388
Other buildings and improvements	324	304
Equipment	122	128
Construction in process	581	531
Total property, plant and equipment	9,134	8,446
Total net property, plant and equipment	7,385	6,765
Capitalized Interest Costs [Abstract]
Capitalized interest	8	26	$ 17
Piedmont | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(1,749)	(1,681)
Piedmont | Regulated | Natural gas transmission and distribution
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	7,663	6,947
Piedmont | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	$ 165	$ 148