Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 453	$ 343
Other	164	170
Other Noncurrent Assets
Other	12	7
Total cash, cash equivalents and restricted cash	629	520	$ 743	$ 556
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	36	7
Other	5
Other Noncurrent Assets
Other	1	1
Total cash, cash equivalents and restricted cash	42	8	21	21
Progress Energy
Current Assets
Cash and cash equivalents	101	70
Other	34	39
Other Noncurrent Assets
Other	2	4
Total cash, cash equivalents and restricted cash	137	113	119	200
Duke Energy Progress
Current Assets
Cash and cash equivalents	58	35
Other	17
Other Noncurrent Assets
Other	2	4
Total cash, cash equivalents and restricted cash	77	39	51	39
Duke Energy Florida
Current Assets
Cash and cash equivalents	25	23
Other	17	39
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 42	$ 62	$ 57	$ 50