Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 344	$ 314
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	442	421	$ 483	$ 357
Duke Energy (Parent)
Current Assets
Cash and cash equivalents	344	314
Other	75	84
Other Noncurrent Assets
Other	23	20
Total cash, cash equivalents and restricted cash	442	418
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	7	6
Other	9	9
Other Noncurrent Assets
Other	1	1
Total cash, cash equivalents and restricted cash	17	16	20	19
Progress Energy
Current Assets
Cash and cash equivalents	58	73
Other	66	76
Other Noncurrent Assets
Other	11	11
Total cash, cash equivalents and restricted cash	135	160	160	135
Duke Energy Progress
Current Assets
Cash and cash equivalents	24	24
Other	37	40
Other Noncurrent Assets
Other	5	5
Total cash, cash equivalents and restricted cash	66	69	70	51
Duke Energy Florida
Current Assets
Cash and cash equivalents	16	33
Other	28	35
Other Noncurrent Assets
Other	7	7
Total cash, cash equivalents and restricted cash	$ 51	$ 75	$ 73	$ 67