Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents		$ 409
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 624	603	$ 1,020	$ 520
Duke Energy (Parent)
Current Assets
Cash and cash equivalents	451	409
Other	42	82
Other Noncurrent Assets
Other	11	11
Total cash, cash equivalents and restricted cash	504	502
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	24	44
Other	5	8
Other Noncurrent Assets
Other	1	1
Total cash, cash equivalents and restricted cash	30	53	9	8
Progress Energy
Current Assets
Cash and cash equivalents	93	108
Other	37	74
Other Noncurrent Assets
Other	4	2
Total cash, cash equivalents and restricted cash	134	184	95	113
Duke Energy Progress
Current Assets
Cash and cash equivalents	50	49
Other	14	28
Other Noncurrent Assets
Other	4	2
Total cash, cash equivalents and restricted cash	68	79	59	39
Duke Energy Florida
Current Assets
Cash and cash equivalents	26	45
Other	18	41
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 44	$ 86	$ 26	$ 62