Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Current Assets
Cash and cash equivalents	$ 2,140	$ 245
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	2,252	363	$ 536	$ 421
Duke Energy (Parent)
Current Assets
Cash and cash equivalents	2,140	245
Other	78	84
Other Noncurrent Assets
Other	34	34
Total cash, cash equivalents and restricted cash	2,252	363
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	44	3
Other	31	12
Other Noncurrent Assets
Other	7	7
Total cash, cash equivalents and restricted cash	82	22	53	16
Progress Energy
Current Assets
Cash and cash equivalents	102	54
Other	47	71
Other Noncurrent Assets
Other	13	14
Total cash, cash equivalents and restricted cash	162	139	132	160
Duke Energy Progress
Current Assets
Cash and cash equivalents	63	16
Other	37	38
Other Noncurrent Assets
Other	7	7
Total cash, cash equivalents and restricted cash	107	61	81	69
Duke Energy Florida
Current Assets
Cash and cash equivalents	17	21
Other	10	34
Other Noncurrent Assets
Other	6	7
Total cash, cash equivalents and restricted cash	$ 33	$ 62	$ 33	$ 75