Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating revenues	$ 7,132	$ 6,150
Segment income (loss)	818	953
Less: Noncontrolling interests	37	51
Add: Preferred stock dividend	39	39
Net Income	820	941
Segment assets	171,220		$ 169,587
Impairment of assets and other charges	215
Unregulated operating revenue	(197)	(182)
Incurred costs	1,630	1,402
Equity in earnings (losses) of unconsolidated affiliates	25	(17)
Duke Energy Carolinas
Segment Reporting Information [Line Items]
Operating revenues	1,888	1,716
Segment assets	48,033		47,162
Impairment of assets and other charges	3
Incurred costs	512	441
Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating revenues	638	532
Segment income (loss)	77	91
Segment assets	10,731		$ 10,774
Incurred costs	178	108
Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	5,995	5,273
Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	1,009	752
Gas Utilities and Infrastructure | Asset Impairment for Regulatory Action
Segment Reporting Information [Line Items]
Equity in earnings (losses) of unconsolidated affiliates		(6)
Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	121	119
Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	7,125	6,144
Other
Segment Reporting Information [Line Items]
Operating revenues	7	6
Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	6,002	5,281
Segment income (loss)	723	820
Segment assets	144,790
Operating Segments | Electric Utilities and Infrastructure | Duke Energy Supreme Court Ruling
Segment Reporting Information [Line Items]
Operating revenues	46
Less: Noncontrolling interests	(22)
Impairment of assets and other charges	211
Operating Segments | Electric Utilities and Infrastructure | Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating revenues	412	363
Segment income (loss)	41	50
Segment assets	7,101
Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	1,032	775
Segment income (loss)	254	245
Segment assets	15,170
Operating Segments | Gas Utilities and Infrastructure | Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating revenues	226	169
Segment income (loss)	38	43
Segment assets	3,784
Operating Segments | Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	121	119
Segment income (loss)	11	27
Segment assets	7,021
Operating Segments | Commercial Renewables | Texas Storm Uri
Segment Reporting Information [Line Items]
Segment income (loss)		(35)
Less: Noncontrolling interests		12
Unregulated operating revenue		8
Incurred costs		2
Equity in earnings (losses) of unconsolidated affiliates		(29)
Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	7,155	6,175
Segment income (loss)	988	1,092
Segment assets	166,981
Operating Segments | Total Reportable Segments | Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating revenues	638	532
Segment income (loss)	79	93
Segment assets	10,885
Other | Other
Segment Reporting Information [Line Items]
Operating revenues	30	26
Segment income (loss)	(170)	(139)
Segment assets	4,251
Other | Other | Duke Energy Ohio
Segment Reporting Information [Line Items]
Segment income (loss)	(2)	(2)
Segment assets	14
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(53)	(51)
Segment assets	(12)
Eliminations | Duke Energy Ohio
Segment Reporting Information [Line Items]
Segment assets	(168)
Eliminations | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	7	8
Eliminations | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	23	23
Eliminations | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	30	31
Eliminations | Other
Segment Reporting Information [Line Items]
Operating revenues	$ 23	$ 20