Stockholders' Equity (Earnings Per Share Data) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Class of Stock [Line Items]
Net income available to Duke Energy common stockholders	$ 893	$ 751	$ 1,711	$ 1,704
Accumulated preferred stock dividends adjustment	(12)	(12)
Less: Impact of participating securities	0	1	1	1
Income from continuing operations available to Duke Energy common stockholders	$ 881	$ 738	$ 1,710	$ 1,703
Weighted average common shares outstanding – basic (in shares)	770	769	770	769
Weighted average common shares outstanding – diluted (in shares)	770	769	770	769
EPS available to Duke Energy common stockholders
Basic (in usd per share)	$ 1.14	$ 0.96	$ 2.22	$ 2.21
Diluted (in usd per share)	$ 1.14	$ 0.96	$ 2.22	$ 2.21
Potentially dilutive items excluded from the calculation (in shares)	2	2	2	2
Common Stock
EPS available to Duke Energy common stockholders
Dividends declared per common share (in usd per share)	$ 0.985	$ 0.965	$ 1.970	$ 1.930
Preferred stock, Series A
EPS available to Duke Energy common stockholders
Dividends declared on preferred stock per depositary share (in usd per share)	0.359	$ 0.359	$ 0.719	0.719
Cumulative dividend rate per annum			5.75%
Liquidation preference per share (in usd per share)	25		$ 25
Preferred stock, Series B
EPS available to Duke Energy common stockholders
Dividends declared on preferred stock per depositary share (in usd per share)			$ 24.375	$ 24.375
Cumulative dividend rate per annum			4.875%
Liquidation preference per share (in usd per share)	$ 1,000		$ 1,000