Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating revenues	$ 5,421	$ 5,873	$ 11,370	$ 12,036
Segment income (loss)	(817)	820	82	1,720
Add: Noncontrolling interests	(90)	(84)	(138)	(91)
Add: Preferred stock dividend	15	12	54	12
Net (Loss) Income	(892)	748	(2)	1,641
Segment assets	160,049		160,049		$ 158,838
Net (Loss) Income	(1,968)	44	(1,924)	87
Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	5,026	5,467	10,200	10,788
Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	265	282	905	1,014
Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	123	118	252	224
Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	5,414	5,867	11,357	12,026
Other
Segment Reporting Information [Line Items]
Operating revenues	7	6	13	10
Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	5,034	5,475	10,217	10,804
Segment income (loss)	753	809	1,458	1,559
Segment assets	136,724		136,724
Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	289	306	953	1,062
Segment income (loss)	(1,576)	40	(1,327)	266
Segment assets	13,072		13,072
Operating Segments | Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	123	118	252	224
Segment income (loss)	90	86	147	99
Segment assets	6,386		6,386
Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	5,446	5,899	11,422	12,090
Segment income (loss)	(733)	935	278	1,924
Segment assets	156,182		156,182
Other | Other
Segment Reporting Information [Line Items]
Operating revenues	26	25	49	46
Segment income (loss)	(84)	(115)	(196)	(204)
Segment assets	3,874		3,874
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(51)	(51)	(101)	(100)
Segment assets	(7)		(7)
Eliminations | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	8	8	17	16
Eliminations | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	24	24	48	48
Eliminations | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	32	32	65	64
Eliminations | Other
Segment Reporting Information [Line Items]
Operating revenues	19	19	36	36
Duke Energy Carolinas
Segment Reporting Information [Line Items]
Operating revenues	1,610	1,713	3,358	3,457
Segment assets	44,579		44,579		44,053
Duke Energy Carolinas | Other
Segment Reporting Information [Line Items]
Segment income (loss)			98
Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating revenues	423	433	921	964
Segment income (loss)	66	47	131	116
Segment assets	9,609		9,609		$ 9,338
Duke Energy Ohio | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	330	336	676	691
Segment income (loss)	44	31	74	67
Segment assets	6,378		6,378
Duke Energy Ohio | Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	93	97	245	273
Segment income (loss)	23	17	59	52
Segment assets	3,213		3,213
Duke Energy Ohio | Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	423	433	921	964
Segment income (loss)	67	48	133	119
Segment assets	9,591		9,591
Duke Energy Ohio | Other | Other
Segment Reporting Information [Line Items]
Segment income (loss)	(1)	$ (1)	(2)	$ (3)
Segment assets	26		26
Duke Energy Ohio | Eliminations
Segment Reporting Information [Line Items]
Segment assets	(8)		(8)
ACP | ACP
Segment Reporting Information [Line Items]
Net (Loss) Income	$ (2,000)		$ 2,000