Business Segments (Narrative) (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) Segment segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Revenues	$ 7,351	$ 7,842	$ 6,564	$ 7,011	$ 6,117	$ 6,834	$ 5,638	$ 6,032	$ 28,768	$ 24,621	$ 23,366
Number of reportable segments | Segment									2
Duke Energy Progress
Segment Reporting Information [Line Items]
Revenues									$ 6,753	5,780	5,422
Number of reportable segments | segment									1
Duke Energy Ohio
Segment Reporting Information [Line Items]
Revenues									$ 2,514	$ 2,037	$ 1,858
Number of reportable segments | segment									2
Revenues | Duke Energy Progress | Customer Concentration | One customer
Segment Reporting Information [Line Items]
Revenues									$ 684