Severance (Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Severance expense	$ 102	$ 65	$ 69
Amortization of deferred severance charges	22	33	33
Severance charges adjustments		(19)	(3)
Operation, maintenance and other
Restructuring Cost and Reserve [Line Items]
Severance expense	97
Employee Severance Charges, 2021
Restructuring Cost and Reserve [Line Items]
Severance charges adjustments	(6)
Employee Severance Charges, 2022
Restructuring Cost and Reserve [Line Items]
Severance charges adjustments	(14)
Duke Energy Carolinas
Restructuring Cost and Reserve [Line Items]
Severance expense	53	40	33
Amortization of deferred severance charges	14	22	22
Severance charges adjustments		(6)	(2)
Duke Energy Carolinas | Employee Severance Charges, 2021
Restructuring Cost and Reserve [Line Items]
Severance charges adjustments	(2)
Duke Energy Carolinas | Employee Severance Charges, 2022
Restructuring Cost and Reserve [Line Items]
Severance charges adjustments	(7)
Progress Energy
Restructuring Cost and Reserve [Line Items]
Severance expense	33	20	26
Amortization of deferred severance charges	8	11	11
Severance charges adjustments		(8)
Progress Energy | Employee Severance Charges, 2021
Restructuring Cost and Reserve [Line Items]
Severance charges adjustments	(3)
Progress Energy | Employee Severance Charges, 2022
Restructuring Cost and Reserve [Line Items]
Severance charges adjustments	(5)
Duke Energy Progress
Restructuring Cost and Reserve [Line Items]
Severance expense	21	17	20
Amortization of deferred severance charges	8	11	11
Severance charges adjustments		(4)
Duke Energy Progress | Employee Severance Charges, 2021
Restructuring Cost and Reserve [Line Items]
Amortization of deferred severance charges	(2)
Duke Energy Progress | Employee Severance Charges, 2022
Restructuring Cost and Reserve [Line Items]
Severance charges adjustments	(3)
Duke Energy Florida
Restructuring Cost and Reserve [Line Items]
Severance expense	12	3	6
Severance charges adjustments		(4)
Duke Energy Florida | Employee Severance Charges, 2021
Restructuring Cost and Reserve [Line Items]
Amortization of deferred severance charges	(1)
Duke Energy Florida | Employee Severance Charges, 2022
Restructuring Cost and Reserve [Line Items]
Severance charges adjustments	(2)
Duke Energy Ohio
Restructuring Cost and Reserve [Line Items]
Severance expense	3	1	2
Severance charges adjustments		(1)
Duke Energy Ohio | Employee Severance Charges, 2022
Restructuring Cost and Reserve [Line Items]
Severance charges adjustments	(1)
Duke Energy Indiana
Restructuring Cost and Reserve [Line Items]
Severance expense	6	2	3
Severance charges adjustments		(2)	(1)
Duke Energy Indiana | Employee Severance Charges, 2021
Restructuring Cost and Reserve [Line Items]
Amortization of deferred severance charges	(1)
Duke Energy Indiana | Employee Severance Charges, 2022
Restructuring Cost and Reserve [Line Items]
Severance charges adjustments	(1)
Piedmont
Restructuring Cost and Reserve [Line Items]
Severance expense	$ 4	2	$ 2
Severance charges adjustments		$ (1)