Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 409	$ 341
Other	173	170
Other Noncurrent Assets
Other	11	6
Total cash, cash equivalents and restricted cash	593	517
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	44	7
Other	8
Other Noncurrent Assets
Other	1	1
Total cash, cash equivalents and restricted cash	53	8
Progress Energy
Current Assets
Cash and cash equivalents	108	70
Other	74	39
Other Noncurrent Assets
Other	2	4
Total cash, cash equivalents and restricted cash	184	113
Duke Energy Progress
Current Assets
Cash and cash equivalents	49	35
Other	28
Other Noncurrent Assets
Other	2	4
Total cash, cash equivalents and restricted cash	79	39
Duke Energy Florida
Current Assets
Cash and cash equivalents	45	23
Other	41	39
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 86	$ 62