Business Segments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Revenues	$ 25,097	$ 23,868	$ 25,079
Duke Energy Progress
Segment Reporting Information [Line Items]
Revenues	$ 5,780	5,422	5,957
Number of reportable segments | segment	1
Duke Energy Ohio
Segment Reporting Information [Line Items]
Revenues	$ 2,037	$ 1,858	$ 1,940
Number of reportable segments | segment	2
Revenues | Duke Energy Progress | Customer Concentration | One customer
Segment Reporting Information [Line Items]
Revenues	$ 586