Severance (Rollforward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 64	$ 39
Provision/Adjustments	80	33
Cash Reductions	(42)	(8)
Balance, end of period	102	64
Duke Energy Carolinas
Restructuring Reserve [Roll Forward]
Balance, beginning of period	15	2
Provision/Adjustments	30	14
Cash Reductions	(10)	(1)
Balance, end of period	35	15
Progress Energy
Restructuring Reserve [Roll Forward]
Balance, beginning of period	6	2
Provision/Adjustments	13	4
Cash Reductions	(3)
Balance, end of period	16	6
Duke Energy Progress
Restructuring Reserve [Roll Forward]
Balance, beginning of period	4	1
Provision/Adjustments	6	3
Cash Reductions	(2)
Balance, end of period	8	4
Duke Energy Florida
Restructuring Reserve [Roll Forward]
Balance, beginning of period	2	1
Provision/Adjustments	7	1
Cash Reductions	(1)
Balance, end of period	8	2
Duke Energy Ohio
Restructuring Reserve [Roll Forward]
Provision/Adjustments	1
Balance, end of period	1
Duke Energy Indiana
Restructuring Reserve [Roll Forward]
Provision/Adjustments	4
Balance, end of period	4
Piedmont
Restructuring Reserve [Roll Forward]
Balance, beginning of period	1
Provision/Adjustments	2	1
Cash Reductions	(1)
Balance, end of period	$ 2	$ 1