Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating revenues	$ 5,949	$ 6,163
Segment income (loss)	899	900
Add: Noncontrolling interests	(48)	(7)
Add: Preferred stock dividend	39
Net Income	890	893
Segment assets	160,072		$ 158,838
Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	5,174	5,321
Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	640	732
Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	129	106
Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	5,943	6,159
Other
Segment Reporting Information [Line Items]
Operating revenues	6	4
Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	5,183	5,329
Segment income (loss)	705	750
Segment assets	134,838
Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	664	756
Segment income (loss)	249	226
Segment assets	14,098
Operating Segments | Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	129	106
Segment income (loss)	57	13
Segment assets	6,184
Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	5,976	6,191
Segment income (loss)	1,011	989
Segment assets	155,120
Other | Other
Segment Reporting Information [Line Items]
Operating revenues	23	21
Segment income (loss)	(112)	(89)
Segment assets	4,964
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(50)	(49)
Segment assets	(12)
Eliminations | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	9	8
Eliminations | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	24	24
Eliminations | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	33	32
Eliminations | Other
Segment Reporting Information [Line Items]
Operating revenues	17	17
Duke Energy Carolinas
Segment Reporting Information [Line Items]
Operating revenues	1,748	1,744
Segment assets	44,051		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	498	531
Segment income (loss)	65	69
Segment assets	9,397		$ 9,338
Duke Energy Ohio | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues		531
Segment income (loss)		71
Duke Energy Ohio | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	346	355
Segment income (loss)	30	36
Segment assets	6,238
Duke Energy Ohio | Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	152	176
Segment income (loss)	36	35
Segment assets	3,135
Duke Energy Ohio | Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	498
Segment income (loss)	66
Segment assets	9,373
Duke Energy Ohio | Other
Segment Reporting Information [Line Items]
Segment income (loss)		$ (2)
Duke Energy Ohio | Other | Other
Segment Reporting Information [Line Items]
Segment income (loss)	(1)
Segment assets	26
Duke Energy Ohio | Eliminations
Segment Reporting Information [Line Items]
Segment assets	$ (2)