Condensed Consolidated Statements of Changes in Equity - Piedmont - USD ($) $ in Millions	Total	Retained Earnings	Piedmont	Piedmont Common Stock	Piedmont Retained Earnings
Beginning Balance (parent) at Dec. 31, 2020			$ 2,715	$ 1,310	$ 1,405
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Duke Energy Corporation	$ 3,162		175		175
Contribution from parent			325	325
Other	1	$ 0	(1)		(1)
Ending Balance (parent) at Sep. 30, 2021			3,214	1,635	1,579
Beginning Balance (parent) at Jun. 30, 2021			3,239	1,635	1,604
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Duke Energy Corporation	1,405		(24)		(24)
Other	1		(1)		(1)
Ending Balance (parent) at Sep. 30, 2021			3,214	1,635	1,579
Beginning Balance (parent) at Dec. 31, 2021	49,296		3,349	1,635	1,714
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Duke Energy Corporation	3,186		180		180
Other	3	1
Ending Balance (parent) at Sep. 30, 2022	50,345		3,529	1,635	1,894
Beginning Balance (parent) at Jun. 30, 2022			3,562	1,635	1,927
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Duke Energy Corporation	1,422		(33)		(33)
Other	2	$ (1)
Ending Balance (parent) at Sep. 30, 2022	$ 50,345		$ 3,529	$ 1,635	$ 1,894