Variable Interest Entities (Sales and Cash Flows) (Details) - Non-consolidated VIEs - CRC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Duke Energy Ohio
Variable Interest Entity [Line Items]
Receivables sold	$ 474	$ 2,578	$ 2,562
Loss recognized on sale	7	34	18
Cash proceeds from receivables sold	478	2,591	2,424
Collection fees received	0	1	1
Return received on retained interests	4	19	10
Duke Energy Indiana
Variable Interest Entity [Line Items]
Receivables sold	473	3,223	3,744
Loss recognized on sale	6	39	26
Cash proceeds from receivables sold	523	3,294	3,498
Collection fees received	0	2	2
Return received on retained interests	$ 4	$ 25	$ 15