Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net Income	$ 1,323	$ 1,066	$ 2,964	$ 2,190
Other Comprehensive (Loss) Income, net of tax
Pension and OPEB adjustments	(2)	1	1	3
Net unrealized (losses) gains on cash flow hedges	(16)	(3)	(62)	10
Reclassification into earnings from cash flow hedges	1	6	4	5
Unrealized gains (losses) on available-for-sale securities	2		10	(5)
Other Comprehensive (Loss) Income, net of tax	(15)	4	(47)	13
Comprehensive Income	1,308	1,070	2,917	2,203
Less: Comprehensive Loss Attributable to Noncontrolling Interests	(19)	(16)	(110)	(12)
Less: Preferred Dividends	15		27
Comprehensive Income Attributable to Duke Energy Corporation	$ 1,312	$ 1,086	$ 3,000	$ 2,215