Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	$ 25,097	$ 23,868	$ 25,079
Interest expense	2,280	2,162	2,204
Depreciation and amortization	4,990	4,705	4,548
Equity in earnings (losses) of unconsolidated affiliates	28	(2,005)	162
Income tax expense (benefit) from continuing operations	192	(236)	519
Segment income (loss)	3,795	1,263	3,714
Less noncontrolling interest	329	295	177
Add back preferred stock dividend	106	107	41
Loss from discontinued operations, net of tax	7	7	(7)
Net income	3,579	1,082	3,571
Net (loss) income attributable to Duke Energy	3,908	1,377	3,748
Capital expenditures	9,752	10,421	11,446
Segment assets	169,587	162,388	158,838
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	356	984	(8)
Total income (loss) from continuing operations before income taxes	3,764	839	4,097
Nonregulated electric and other	770	765	705
Income (loss) attributable to noncontrolling interest	(329)	(295)	(177)
Duke Energy Ohio
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	2,037	1,858	1,940
Interest expense	111	102	109
Depreciation and amortization	307	278	265
Income tax expense (benefit) from continuing operations	30	43	40
Segment income (loss)	204	252	239
Loss from discontinued operations, net of tax			(1)
Net (loss) income attributable to Duke Energy	204	252	238
Capital expenditures	848	834	952
Segment assets	10,774	10,025	9,338
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	25
Total income (loss) from continuing operations before income taxes	234	295	279
Duke Energy Carolinas
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	7,102	7,015	7,395
Interest expense	538	487	463
Depreciation and amortization	1,468	1,462	1,388
Income tax expense (benefit) from continuing operations	51	88	311
Net (loss) income attributable to Duke Energy	1,336	956	1,403
Segment assets	47,162	45,048
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	227	476	17
Total income (loss) from continuing operations before income taxes	1,387	1,044	1,714
Duke Energy Progress
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	5,780	5,422	5,957
Interest expense	306	269	306
Depreciation and amortization	1,097	1,116	1,143
Income tax expense (benefit) from continuing operations	75	(36)	157
Net (loss) income attributable to Duke Energy	991	415	805
Segment assets	35,383	33,733
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	63	499	12
Total income (loss) from continuing operations before income taxes	1,066	379	962
Eliminations
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	(205)	(199)	(200)
Interest expense	(9)	(16)	(58)
Depreciation and amortization	(26)	(29)	(5)
Segment assets			188
Eliminations | Duke Energy Ohio
Segment Reporting Information, Profit (Loss) [Abstract]
Segment assets	(29)	(2)
Electric Utilities and Infrastructure
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	22,570	21,687	22,798
Equity in earnings (losses) of unconsolidated affiliates	7	(1)	9
Segment Reporting Information Assets [Abstract]
After tax impairment charge		948
Reduction of prior year impairment		152
Shareholder contribution expense		16
Electric Utilities and Infrastructure | Gas Pipeline Assets
Segment Reporting Information Assets [Abstract]
After tax impairment charge		5
Electric Utilities and Infrastructure | Clemson University Combined Heat and Power Plant
Segment Reporting Information Assets [Abstract]
After tax impairment charge		19
Electric Utilities and Infrastructure | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	22,603	21,720	22,831
Interest expense	1,432	1,320	1,345
Depreciation and amortization	4,251	4,068	3,951
Equity in earnings (losses) of unconsolidated affiliates	7	(1)	9
Income tax expense (benefit) from continuing operations	494	340	785
Segment income (loss)	3,850	2,669	3,536
Capital expenditures	7,653	7,629	8,263
Segment assets	143,841	138,225	135,561
Segment Reporting Information Assets [Abstract]
Reduction of prior year impairment			27
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Ohio
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	1,493	1,405	1,456
Interest expense	87	85	80
Depreciation and amortization	217	200	182
Income tax expense (benefit) from continuing operations	15	19	20
Segment income (loss)	141	162	159
Capital expenditures	486	548	680
Segment assets	6,882	6,615	6,188
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Impairment Charges
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	160
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Other Income and Expense
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	77
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Operation, Maintenance and Other
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	5
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Regulated Operating Revenue, Electric, Non-Nuclear
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	13
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Interest Expense
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	3
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Depreciation and amortization
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	6
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Impairment Charges
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	42
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Other Income and Expense
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	34
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Operation, Maintenance and Other
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	7
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Regulated Operating Revenue, Electric, Non-Nuclear
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	15
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Interest Expense
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	5
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Depreciation and amortization
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	1
Electric Utilities and Infrastructure | Eliminations
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	33	33	33
Gas Utilities and Infrastructure
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	2,022	1,653	1,770
Equity in earnings (losses) of unconsolidated affiliates	8	(2,017)	114
Segment Reporting Information Assets [Abstract]
After tax impairment charge		7
Gas Utilities and Infrastructure | After-tax impairment charge
Segment Reporting Information, Profit (Loss) [Abstract]
Equity in earnings (losses) of unconsolidated affiliates		2,100
Segment Reporting Information Assets [Abstract]
After tax impairment charge			19
Gas Utilities and Infrastructure | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	2,112	1,748	1,866
Interest expense	142	135	117
Depreciation and amortization	303	258	256
Equity in earnings (losses) of unconsolidated affiliates	8	(2,017)	114
Income tax expense (benefit) from continuing operations	55	(349)	22
Segment income (loss)	396	(1,266)	432
Capital expenditures	1,271	1,309	1,539
Segment assets	15,179	13,849	13,921
Gas Utilities and Infrastructure | Operating Segments | Duke Energy Ohio
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	544	453	484
Interest expense	24	17	29
Depreciation and amortization	90	78	83
Income tax expense (benefit) from continuing operations	19	26	21
Segment income (loss)	78	96	85
Capital expenditures	362	286	272
Segment assets	3,892	3,380	3,116
Gas Utilities and Infrastructure | Operating Segments | Gas Pipeline Assets
Segment Reporting Information, Profit (Loss) [Abstract]
Equity in earnings (losses) of unconsolidated affiliates	20
Gas Utilities and Infrastructure | Eliminations
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	90	95	96
Commercial Renewables
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	476	502	487
Equity in earnings (losses) of unconsolidated affiliates	(34)		(4)
Commercial Renewables | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	476	502	487
Interest expense	72	66	95
Depreciation and amortization	225	199	168
Equity in earnings (losses) of unconsolidated affiliates	(34)		(4)
Income tax expense (benefit) from continuing operations	(78)	(65)	(115)
Segment income (loss)	201	286	198
Capital expenditures	543	1,219	1,423
Segment assets	6,977	6,716	6,020
Commercial Renewables | Operating Segments | Texas Storm Uri
Segment Reporting Information, Profit (Loss) [Abstract]
Equity in earnings (losses) of unconsolidated affiliates	29
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	(35)
Nonregulated electric and other	8
Income (loss) attributable to noncontrolling interest	(12)
Commercial Renewables | Operating Segments | Texas Storm Uri | Operation, Maintenance and Other
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	2
Total Reportable Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	25,068	23,842	25,055
Total Reportable Segments | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	25,191	23,970	25,184
Interest expense	1,646	1,521	1,557
Depreciation and amortization	4,779	4,525	4,375
Equity in earnings (losses) of unconsolidated affiliates	(19)	(2,018)	119
Income tax expense (benefit) from continuing operations	471	(74)	692
Segment income (loss)	4,447	1,689	4,166
Capital expenditures	9,467	10,157	11,225
Segment assets	165,997	158,790	155,502
Total Reportable Segments | Operating Segments | Duke Energy Ohio
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	2,037	1,858	1,940
Interest expense	111	102	109
Depreciation and amortization	307	278	265
Income tax expense (benefit) from continuing operations	34	45	41
Segment income (loss)	219	258	244
Capital expenditures	848	834	952
Segment assets	10,774	9,995	9,304
Total Reportable Segments | Eliminations
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	123	128	129
Other
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	29	26	24
Segment Reporting Information Assets [Abstract]
Severance charge reversal		98
Other | Operating Segments | Duke Energy Carolinas | Impairment Charges
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	133
Other | Operating Segments | Duke Energy Progress | Operation, Maintenance and Other
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	42
Other | Operating Segments | Duke Energy Progress | Depreciation and amortization
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	17
Other | Other
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	111	97	95
Interest expense	643	657	705
Depreciation and amortization	237	209	178
Equity in earnings (losses) of unconsolidated affiliates	47	13	43
Income tax expense (benefit) from continuing operations	(279)	(162)	(173)
Segment income (loss)	(652)	(426)	(452)
Capital expenditures	285	264	221
Segment assets	3,590	3,598	3,148
Other | Other | Duke Energy Ohio
Segment Reporting Information, Profit (Loss) [Abstract]
Income tax expense (benefit) from continuing operations	(4)	(2)	(1)
Segment income (loss)	(15)	(6)	(5)
Segment assets	29	32	34
Other | Eliminations
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	$ 82	$ 71	$ 71