Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020		Mar. 31, 2019
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net Income	$ 890		$ 893
Other Comprehensive Loss, net of tax(a)
Pension and OPEB adjustments	1
Net unrealized losses on cash flow hedges	(81)		(17)
Reclassification into earnings from cash flow hedges	2		1
Unrealized gains on available-for-sale securities	1		4
Other Comprehensive Loss, net of tax	(77)	[1]	(12)
Comprehensive Income	813		881
Less: Comprehensive Loss Attributable to Noncontrolling Interests	(62)		(7)
Comprehensive Income Attributable to Duke Energy	875		888
Less: Preferred Dividends	39
Comprehensive Income Available to Duke Energy Corporation Common Stockholders	$ 836		$ 888

[1] Net of income tax impact of approximately $23 million in the first quarter of 2020 and immaterial income tax impact in the first quarter of 2019.