Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income (loss)		$ 698	$ (892)	$ 1,639	$ (2)
Other Comprehensive Loss, net of tax
Pension and OPEB adjustments	[1]		(1)	2
Net unrealized (losses) gains on cash flow hedges	[1]	(97)	5	(68)	(76)
Reclassification into earnings from cash flow hedges	[1]	4	2	7	4
Unrealized gains (losses) on available-for-sale securities	[1]	4	6	(4)	7
Other Comprehensive (Loss) Income, net of tax	[1]	(89)	12	(63)	(65)
Comprehensive Income (Loss)		609	(880)	1,576	(67)
Add: Comprehensive Loss Attributable to Noncontrolling Interests		68	88	112	150
Comprehensive Income (Loss) Attributable to Duke Energy		677	(792)	1,688	83
Less: Preferred Dividends		14	15	53	54
Comprehensive Income (Loss) Available to Duke Energy Corporation Common Stockholders		$ 663	$ (807)	$ 1,635	$ 29

[1] Net of income tax impacts of approximately $27 million for the three months ended June 30, 2021, and $19 million and $20 million for the six months ended June 30, 2021, and 2020, respectively. All other periods presented include immaterial income tax impacts.