Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 459	$ 253
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	518	357	$ 624	$ 603
Duke Energy (Parent)
Current Assets
Cash and cash equivalents	459	253
Other	33	76
Other Noncurrent Assets
Other	17	16
Total cash, cash equivalents and restricted cash	509	345
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	5	9
Other	6	9
Other Noncurrent Assets
Other	1	1
Total cash, cash equivalents and restricted cash	12	19	30	53
Progress Energy
Current Assets
Cash and cash equivalents	49	59
Other	27	67
Other Noncurrent Assets
Other	10	9
Total cash, cash equivalents and restricted cash	86	135	134	184
Duke Energy Progress
Current Assets
Cash and cash equivalents	27	18
Other	18	31
Other Noncurrent Assets
Other	4	2
Total cash, cash equivalents and restricted cash	49	51	68	79
Duke Energy Florida
Current Assets
Cash and cash equivalents	4	24
Other	9	36
Other Noncurrent Assets
Other	7	7
Total cash, cash equivalents and restricted cash	$ 20	$ 67	$ 44	$ 86