Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 341	$ 311
Other	193	222
Other Noncurrent Assets
Other	107	40
Total cash, cash equivalents and restricted cash	641	573	$ 481	$ 591
Progress Energy
Current Assets
Cash and cash equivalents	78	48
Other	31	39
Other Noncurrent Assets
Other	102	39
Total cash, cash equivalents and restricted cash	211	126	120	112
Duke Energy Florida
Current Assets
Cash and cash equivalents	20	17
Other	31	39
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 51	$ 56	$ 47	$ 75