Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net (loss) income		$ (892)	$ 748	$ (2)	$ 1,641
Other Comprehensive Loss, net of tax(a)
Pension and OPEB adjustments	[1]	(1)	3		3
Net unrealized gains (losses) on cash flow hedges	[1]	5	(29)	(76)	(46)
Reclassification into earnings from cash flow hedges	[1]	2	2	4	3
Unrealized gains on available-for-sale securities	[1]	6	4	7	8
Other Comprehensive Income (Loss), net of tax	[1]	12	(20)	(65)	(32)
Comprehensive (Loss) Income		(880)	728	(67)	1,609
Add: Comprehensive Loss Attributable to Noncontrolling Interests		88	84	150	91
Comprehensive (Loss) Income Attributable to Duke Energy		(792)	812	83	1,700
Less: Preferred Dividends		15	12	54	12
Comprehensive (Loss) Income Available to Duke Energy Corporation Common Stockholders		$ (807)	$ 800	$ 29	$ 1,688

[1] Net of income tax impacts of approximately $20 million and $10 million for the six months ended June 30, 2020, and 2019, respectively. All other periods presented include immaterial income tax impacts.