Variable Interest Entities (Sales and Cash Flows) (Details) - Non-consolidated VIEs - CRC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Duke Energy Ohio
Variable Interest Entity [Line Items]
Receivables sold	$ 2,578	$ 2,562	$ 2,023
Loss recognized on sale	34	18	10
Cash proceeds from receivables sold	2,591	2,424	2,018
Collection fees received	1	1	1
Return received on retained interests	19	10	4
Duke Energy Indiana
Variable Interest Entity [Line Items]
Receivables sold	3,223	3,744	2,909
Loss recognized on sale	39	26	13
Cash proceeds from receivables sold	3,294	3,498	2,909
Collection fees received	2	2	1
Return received on retained interests	$ 25	$ 15	$ 6