Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income (loss)		$ 1,276	$ 1,234	$ 2,915	$ 1,232
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	[1]	1	1	3	1
Net unrealized gains (losses) on cash flow hedges	[1]	9	(83)	(59)	(159)
Reclassification into earnings from cash flow hedges	[1]	2	4	9	8
Unrealized (losses) gains on available-for-sale securities	[1]	(2)	(2)	(6)	5
Other Comprehensive Income (Loss), net of tax	[1]	10	(80)	(53)	(145)
Comprehensive Income		1,286	1,154	2,862	1,087
Add: Comprehensive Loss Attributable to Noncontrolling Interests		128	70	240	220
Comprehensive Income Attributable to Duke Energy		1,414	1,224	3,102	1,307
Less: Preferred Dividends		39	39	92	93
Comprehensive Income Available to Duke Energy Corporation Common Stockholders		$ 1,375	$ 1,185	$ 3,010	$ 1,214

[1] Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020, and $16 million and $43 million for the nine months ended September 30, 2021, and 2020, respectively. All other periods presented include immaterial income tax impacts.