Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents		$ 409
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 567	603	$ 639	$ 520
Duke Energy (Parent)
Current Assets
Cash and cash equivalents	377	409
Other	73	82
Other Noncurrent Assets
Other	11	11
Total cash, cash equivalents and restricted cash	461	502
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	20	44
Other	8	8
Other Noncurrent Assets
Other	1	1
Total cash, cash equivalents and restricted cash	29	53	47	8
Progress Energy
Current Assets
Cash and cash equivalents	77	108
Other	65	74
Other Noncurrent Assets
Other	4	2
Total cash, cash equivalents and restricted cash	146	184	192	113
Duke Energy Progress
Current Assets
Cash and cash equivalents	21	49
Other	25	28
Other Noncurrent Assets
Other	4	2
Total cash, cash equivalents and restricted cash	50	79	105	39
Duke Energy Florida
Current Assets
Cash and cash equivalents	37	45
Other	36	41
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 73	$ 86	$ 77	$ 62