Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 314	$ 253
Other	84	76
Other Noncurrent Assets
Other	20	16
Total cash, cash equivalents and restricted cash	418	345
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	6	9
Other	9	9
Other Noncurrent Assets
Other	1	1
Total cash, cash equivalents and restricted cash	16	19
Progress Energy
Current Assets
Cash and cash equivalents	73	59
Other	76	67
Other Noncurrent Assets
Other	11	9
Total cash, cash equivalents and restricted cash	160	135
Duke Energy Progress
Current Assets
Cash and cash equivalents	24	18
Other	40	31
Other Noncurrent Assets
Other	5	2
Total cash, cash equivalents and restricted cash	69	51
Duke Energy Florida
Current Assets
Cash and cash equivalents	33	24
Other	35	36
Other Noncurrent Assets
Other	7	7
Total cash, cash equivalents and restricted cash	$ 75	$ 67