Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 1,450	$ 311
Other	185	222
Other Noncurrent Assets
Other	63	40
Total cash, cash equivalents and restricted cash	1,698	573	$ 550	$ 591
Progress Energy
Current Assets
Cash and cash equivalents	52	48
Other	13	39
Other Noncurrent Assets
Other	60	39
Total cash, cash equivalents and restricted cash	125	126	95	112
Duke Energy Florida
Current Assets
Cash and cash equivalents	12	17
Other	13	39
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 25	$ 56	$ 20	$ 75