Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 253	$ 409
Other	76	82
Other Noncurrent Assets
Other	16	11
Total cash, cash equivalents and restricted cash	345	502
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	9	44
Other	9	8
Other Noncurrent Assets
Other	1	1
Total cash, cash equivalents and restricted cash	19	53
Progress Energy
Current Assets
Cash and cash equivalents	59	108
Other	67	74
Other Noncurrent Assets
Other	9	2
Total cash, cash equivalents and restricted cash	135	184
Duke Energy Progress
Current Assets
Cash and cash equivalents	18	49
Other	31	28
Other Noncurrent Assets
Other	2	2
Total cash, cash equivalents and restricted cash	51	79
Duke Energy Florida
Current Assets
Cash and cash equivalents	24	45
Other	36	41
Other Noncurrent Assets
Other	7
Total cash, cash equivalents and restricted cash	$ 67	$ 86