Severance (Rollforward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 39	$ 11
Provision/Adjustments	33	36
Cash Reductions	(8)	(8)
Balance, end of period	64	39
Duke Energy Carolinas
Restructuring Reserve [Roll Forward]
Balance, beginning of period	2	2
Provision/Adjustments	14	1
Cash Reductions	(1)	(1)
Balance, end of period	15	2
Progress Energy
Restructuring Reserve [Roll Forward]
Balance, beginning of period	2	3
Provision/Adjustments	4	1
Cash Reductions		(2)
Balance, end of period	6	2
Duke Energy Progress
Restructuring Reserve [Roll Forward]
Balance, beginning of period	1	1
Provision/Adjustments	3	1
Cash Reductions		(1)
Balance, end of period	4	1
Duke Energy Florida
Restructuring Reserve [Roll Forward]
Balance, beginning of period	1	2
Provision/Adjustments	1
Cash Reductions	0	(1)
Balance, end of period	2	1
Duke Energy Indiana
Restructuring Reserve [Roll Forward]
Balance, beginning of period		1
Cash Reductions		$ (1)
Piedmont
Restructuring Reserve [Roll Forward]
Provision/Adjustments	1
Balance, end of period	$ 1