Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 428	$ 343
Other	193	170
Other Noncurrent Assets
Other	18	7
Total cash, cash equivalents and restricted cash	639	520	$ 565	$ 556
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	37	7
Other	9
Other Noncurrent Assets
Other	1	1
Total cash, cash equivalents and restricted cash	47	8	36	21
Progress Energy
Current Assets
Cash and cash equivalents	129	70
Other	59	39
Other Noncurrent Assets
Other	4	4
Total cash, cash equivalents and restricted cash	192	113	108	200
Duke Energy Progress
Current Assets
Cash and cash equivalents	75	35
Other	26
Other Noncurrent Assets
Other	4	4
Total cash, cash equivalents and restricted cash	105	39	46	39
Duke Energy Florida
Current Assets
Cash and cash equivalents	44	23
Other	33	39
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 77	$ 62	$ 55	$ 50