Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net Income	$ 893	$ 622
Other Comprehensive Income, net of tax
Pension and OPEB adjustments		1
Net unrealized (losses) gains on cash flow hedges	(17)	12
Reclassification into earnings from cash flow hedges	1	1
Unrealized gains (losses) on available-for-sale securities	4	(3)
Other Comprehensive (Loss) Income, net of tax	(12)	11
Comprehensive Income	881	633
Less: Comprehensive (Loss) Income Attributable to Noncontrolling Interests	(7)	2
Comprehensive Income Attributable to Duke Energy Corporation	$ 888	$ 631

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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