Condensed Consolidated Statements of Changes in Equity - Duke Energy Florida - USD ($) $ in Millions		Total		Duke Energy Florida	Duke Energy Florida Member's Equity	Duke Energy Florida Net Unrealized Gains (Losses) on Available-for-Sale Securities
Beginning balance at Dec. 31, 2021				$ 8,295	$ 8,298	$ (3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		$ 3,186		751	751
Other comprehensive income (loss)		(20)	[1]	(3)		(3)
Other		3
Ending balance at Sep. 30, 2022				9,043	9,049	(6)
Beginning balance at Jun. 30, 2022				8,725	8,730	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1,422		319	319
Other comprehensive income (loss)		1	[1]	(1)		(1)
Other		2
Ending balance at Sep. 30, 2022				9,043	9,049	(6)
Beginning balance at Dec. 31, 2022				9,023	9,031	(8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1,836		810	810
Other comprehensive income (loss)		(2)	[1]	2		2
Other		(1)		1	1
Ending balance at Sep. 30, 2023				9,836	9,842	(6)
Beginning balance at Jun. 30, 2023				9,488	9,494	(6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1,252		347	347
Other comprehensive income (loss)	[1]	(6)
Other		$ 2		1	1
Ending balance at Sep. 30, 2023				$ 9,836	$ 9,842	$ (6)

[1] Net of income tax expense of approximately $69 million for the three months ended September 30, 2023, and approximately $78 million and $72 million for the nine months ended September 30, 2023, and 2022, respectively. All other periods presented include immaterial income tax impacts.