Stockholders' Equity (Earnings Per Share Data) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Net Income available to Duke Energy common stockholders	$ 3,802	$ 1,270	$ 3,707
Income (Loss) From Discontinued Operations, net of tax	(7)	(7)	7
Accumulated preferred stock dividends adjustment		1	(15)
Less: Impact of participating securities	4	2	5
Income from continuing operations available to Duke Energy common stockholders	$ 3,791	$ 1,262	$ 3,694
Weighted average common shares outstanding – basic (in shares)	769	737	729
Equity forwards (in shares)		1
Weighted average common shares outstanding – diluted (in shares)	769	738	729
EPS from continuing operations available to Duke Energy common stockholders
Basic (usd per share)	$ 4.93	$ 1.71	$ 5.07
Diluted (usd per share)	$ 4.93	$ 1.71	$ 5.07
Potentially dilutive items excluded from the calculation (in shares)	2	2	2
Dividends declared per share (usd per share)	$ 3.90	$ 3.82	$ 3.75
Series A Preferred Stock
EPS from continuing operations available to Duke Energy common stockholders
Dividends declared on preferred stock (usd per share)	1.437	1.437	$ 1.03
Series B Preferred Stock
EPS from continuing operations available to Duke Energy common stockholders
Dividends declared on preferred stock (usd per share)	$ 48.750	$ 49.292