Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating revenues	$ 6,721	$ 6,940	$ 18,091	$ 18,976
Segment income (loss)	1,265	1,327	1,347	3,047
Less: Noncontrolling interests	(70)	(19)	(208)	(110)
Add: Preferred stock dividend	39	15	93	27
Net Income	1,234	1,323	1,232	2,964
Segment assets	161,409		161,409		$ 158,838
Impairment charges	28	(20)	36	(16)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,339	1,511	1,158	3,388
Equity in losses (earnings) of unconsolidated affiliates	80	(50)	2,004	(137)
Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	6,371	6,569	16,571	17,357
Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	217	225	1,122	1,239
Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	126	138	378	362
Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	6,714	6,932	18,071	18,958
Other
Segment Reporting Information [Line Items]
Operating revenues	7	8	20	18
Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	6,379	6,577	16,596	17,381
Segment income (loss)	1,381	1,385	2,839	2,944
Segment assets	138,142		138,142
Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	241	249	1,194	1,311
Segment income (loss)	(73)	26	(1,400)	292
Segment assets	13,343		13,343
Equity in losses (earnings) of unconsolidated affiliates	(78)		(2,100)
Operating Segments | Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	126	138	378	362
Segment income (loss)	60	40	207	139
Segment assets	6,541		6,541
Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	6,746	6,964	18,168	19,054
Segment income (loss)	1,368	1,451	1,646	3,375
Segment assets	158,026		158,026
Other
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest			98
Other | Other
Segment Reporting Information [Line Items]
Operating revenues	24	25	73	71
Segment income (loss)	(103)	(124)	(299)	(328)
Segment assets	3,387		3,387
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(49)	(49)	(150)	(149)
Segment assets	(4)		(4)
Eliminations | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	8	8	25	24
Eliminations | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	24	24	72	72
Eliminations | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	32	32	97	96
Eliminations | Other
Segment Reporting Information [Line Items]
Operating revenues	17	17	53	53
Duke Energy Carolinas
Segment Reporting Information [Line Items]
Operating revenues	2,058	2,162	5,416	5,619
Segment assets	45,048		45,048		44,053
Impairment charges	20	6	22	11
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	631	708	1,306	1,439
Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating revenues	473	489	1,394	1,453
Segment income (loss)	70	74	201	190
Segment assets	9,749		9,749		9,338
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	84	85	241	224
Duke Energy Ohio | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	394	408	1,070	1,099
Segment income (loss)	63	62	137	129
Segment assets	6,448		6,448
Duke Energy Ohio | Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	79	81	324	354
Segment income (loss)	9	13	68	65
Segment assets	3,297		3,297
Duke Energy Ohio | Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	473	489	1,394	1,453
Segment income (loss)	72	75	205	194
Segment assets	9,745		9,745
Duke Energy Ohio | Other | Other
Segment Reporting Information [Line Items]
Segment income (loss)	(2)	(1)	(4)	(4)
Segment assets	27		27
Duke Energy Ohio | Eliminations
Segment Reporting Information [Line Items]
Segment assets	(23)		(23)
Duke Energy Progress
Segment Reporting Information [Line Items]
Operating revenues	1,626	1,688	4,207	4,559
Segment assets	33,861		33,861		33,377
Impairment charges	5		5
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	357	326	790	775
Piedmont Natural Gas
Segment Reporting Information [Line Items]
Operating revenues	162	168	871	956
Segment assets	8,212		8,212		7,756
Impairment charges	7		7
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(30)	(28)	161	119
Equity in losses (earnings) of unconsolidated affiliates			(7)	(6)
Duke Energy Florida
Segment Reporting Information [Line Items]
Operating revenues	1,567	1,548	3,897	3,987
Segment assets	20,815		20,815		$ 20,454
Impairment charges	(4)	(25)	(4)	(25)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	365	346	782	715
ACP | ACP
Segment Reporting Information [Line Items]
Equity in losses (earnings) of unconsolidated affiliates			2,100
ACP | Piedmont Natural Gas | ACP
Segment Reporting Information [Line Items]
Impairment charges			(7)
Operations, maintenance and other | Duke Energy Carolinas | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	8		8
Operations, maintenance and other | Duke Energy Progress | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	8		8
Impairment charges | Duke Energy Carolinas | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Impairment charges	19		19
Impairment charges | Piedmont Natural Gas | Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Impairment charges	7
Impairment charges | Duke Energy Florida | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Reduction of prior year impairment				$ 25
Impairment charges | ACP | Duke Energy Progress | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Impairment charges	$ 5		$ 5
Revision of Prior Period, Adjustment [Member] | Impairment charges | Duke Energy Florida | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Impairment charges		$ (25)