Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net Income	$ 1,066	$ 955	$ 2,190	$ 2,361
Other Comprehensive Income, net of tax
Pension and OPEB adjustments	1		3	2
Net unrealized (losses) gains on cash flow hedges	(3)	2	10	(2)
Reclassification into earnings from cash flow hedges	6	(2)	5	3
Unrealized (losses) gains on available-for-sale securities		2	(5)	10
Other Comprehensive Income, net of tax	4	2	13	13
Comprehensive Income	1,070	957	2,203	2,374
Less: Comprehensive (Loss) Income Attributable to Noncontrolling Interests	(16)	1	(12)	5
Comprehensive Income Attributable to Duke Energy Corporation	$ 1,086	$ 956	$ 2,215	$ 2,369

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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