Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 324	$ 409
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	574	603	$ 629	$ 520
Duke Energy (Parent)
Current Assets
Cash and cash equivalents	324	409
Other	49	82
Other Noncurrent Assets
Other	9	11
Total cash, cash equivalents and restricted cash	382	502
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	19	44
Other	4	8
Other Noncurrent Assets
Other	1	1
Total cash, cash equivalents and restricted cash	24	53	42	8
Progress Energy
Current Assets
Cash and cash equivalents	87	108
Other	44	74
Other Noncurrent Assets
Other	2	2
Total cash, cash equivalents and restricted cash	133	184	137	113
Duke Energy Progress
Current Assets
Cash and cash equivalents	27	49
Other	17	28
Other Noncurrent Assets
Other	2	2
Total cash, cash equivalents and restricted cash	46	79	77	39
Duke Energy Florida
Current Assets
Cash and cash equivalents	41	45
Other	23	41
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 64	$ 86	$ 42	$ 62