Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 24,703	$ 23,480	$ 24,348
Revenue from sources other than contracts with customers	394	388	731
Total operating revenues	25,097	23,868	25,079
Other
Disaggregation of Revenue [Line Items]
Total operating revenues	1,129	1,069	1,037
Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22,474	21,637	22,347
Total operating revenues	22,570	21,687	22,798
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,097	9,806	9,863
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,375	6,194	6,431
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,924	2,859	3,071
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,199	1,864	2,212
Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	879	914	770
Total operating revenues	977	944	855
Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,983	1,590	1,754
Total operating revenues	2,022	1,653	1,770
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,131	930	976
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	561	446	508
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	158	127	141
Gas Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	133	87	129
Total operating revenues	87	57	84
Commercial Renewables
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	217	227	223
Total operating revenues	476	502	487
Commercial Renewables | Other
Disaggregation of Revenue [Line Items]
Total operating revenues	65	68	98
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	29	26	24
Total operating revenues	29	26	24
Duke Energy Carolinas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,145	7,028	7,241
Revenue from sources other than contracts with customers	(43)	(13)	154
Total operating revenues	7,102	7,015	7,395
Duke Energy Carolinas | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,145	7,028	7,241
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,054	2,997	3,044
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,210	2,233	2,244
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,145	1,137	1,215
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	472	380	462
Duke Energy Carolinas | Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	264	281	276
Progress Energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,962	10,521	10,883
Revenue from sources other than contracts with customers	95	106	319
Total operating revenues	11,057	10,627	11,202
Progress Energy | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,962	10,521	10,883
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,084	5,017	4,998
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,883	2,779	2,935
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	894	901	934
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,385	1,228	1,468
Progress Energy | Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	716	596	548
Duke Energy Progress
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,719	5,348	5,785
Revenue from sources other than contracts with customers	61	74	172
Total operating revenues	5,780	5,422	5,957
Duke Energy Progress | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,719	5,348	5,785
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,156	2,059	2,144
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,378	1,312	1,368
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	634	649	675
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,164	1,034	1,281
Duke Energy Progress | Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	387	294	317
Duke Energy Florida
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,243	5,173	5,098
Revenue from sources other than contracts with customers	16	15	133
Total operating revenues	5,259	5,188	5,231
Duke Energy Florida | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,243	5,173	5,098
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,928	2,958	2,854
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,505	1,467	1,567
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	260	252	259
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	221	194	187
Duke Energy Florida | Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	329	302	231
Duke Energy Ohio
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,026	1,870	1,940
Revenue from sources other than contracts with customers	11	(12)	0
Total operating revenues	2,037	1,858	1,940
Duke Energy Ohio | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,481	1,419	1,457
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	767	726	733
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	440	442	451
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	135	137	147
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	56	32	46
Duke Energy Ohio | Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	83	82	80
Duke Energy Ohio | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	545	451	483
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	354	300	315
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	143	117	130
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	20	17	19
Duke Energy Ohio | Gas Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	28	17	19
Duke Energy Indiana
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,134	2,783	2,987
Revenue from sources other than contracts with customers	40	12	17
Total operating revenues	3,174	2,795	3,004
Duke Energy Indiana | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,134	2,783	2,987
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,188	1,064	1,087
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	825	740	802
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	750	683	774
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	285	224	235
Duke Energy Indiana | Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	86	72	89
Piedmont
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,469	1,173	1,322
Revenue from sources other than contracts with customers	100	124	59
Total operating revenues	1,569	1,297	1,381
Piedmont | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,469	1,173	1,322
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	777	630	661
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	418	329	378
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	137	110	122
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	92	34	51
Piedmont | Gas Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 45	$ 70	$ 110