Income Taxes (Other Disclosures) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1	$ 65	$ 51	$ 125
Gross decreases – tax positions in prior periods(a)	(15)		(86)
Gross increases – current period tax positions	12	14	12
Total changes	(3)	14	(74)
Unrecognized tax benefits – December 31	62	65	51
Federal capital gain			426
Amount that if recognized, would affect the effective tax rate or regulatory liability	57
Valuation allowance	544	519
Foreign Tax Credit
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Valuation allowance	389
Federal Capital Loss
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Valuation allowance	29
Duke Energy Carolinas
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1	17	13	10
Gross increases – current period tax positions	4	4	3
Total changes	4	4	3
Unrecognized tax benefits – December 31	21	17	13
Amount that if recognized, would affect the effective tax rate or regulatory liability	20
Progress Energy
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1	19	15	10
Gross increases – current period tax positions	5	4	5
Total changes	5	4	5
Unrecognized tax benefits – December 31	24	19	15
Amount that if recognized, would affect the effective tax rate or regulatory liability	22
Duke Energy Progress
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1	13	10	6
Gross increases – current period tax positions	5	3	4
Total changes	5	3	4
Unrecognized tax benefits – December 31	18	13	10
Amount that if recognized, would affect the effective tax rate or regulatory liability	16
Duke Energy Florida
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1	5	4	3
Gross increases – current period tax positions	1	1	1
Total changes	1	1	1
Unrecognized tax benefits – December 31	6	5	4
Amount that if recognized, would affect the effective tax rate or regulatory liability	6
Duke Energy Ohio
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1	1	1	1
Gross increases – current period tax positions	1
Total changes	1
Unrecognized tax benefits – December 31	2	1	1
Amount that if recognized, would affect the effective tax rate or regulatory liability	2
Duke Energy Indiana
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1	2	2	1
Gross increases – current period tax positions	1		1
Total changes	1		1
Unrecognized tax benefits – December 31	3	2	2
Amount that if recognized, would affect the effective tax rate or regulatory liability	3
Piedmont
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1	9	4	1
Gross increases – current period tax positions	2	5	3
Total changes	2	5	3
Unrecognized tax benefits – December 31	11	$ 9	$ 4
Amount that if recognized, would affect the effective tax rate or regulatory liability	$ 10