Income Taxes (Other Disclosures) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		$ 51	$ 125	$ 126
Gross decreases – tax positions in prior periods(a)			(86)	(2)
Gross increases – current period tax positions		14	12	4
Reduction due to lapse of statute of limitations				(3)
Total changes		14	(74)	(1)
Unrecognized tax benefits – December 31	$ 51	65	51	125
Amount that if recognized, would affect the effective tax rate or regulatory liability		59
Federal capital gain	426
Duke Energy Carolinas
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		13	10	8
Gross increases – current period tax positions		4	3	2
Total changes		4	3	2
Unrecognized tax benefits – December 31	13	17	13	10
Amount that if recognized, would affect the effective tax rate or regulatory liability		17
Progress Energy
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		15	10	9
Gross increases – current period tax positions		4	5	1
Total changes		4	5	1
Unrecognized tax benefits – December 31	15	19	15	10
Amount that if recognized, would affect the effective tax rate or regulatory liability		18
Duke Energy Progress
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		10	6	6
Gross increases – current period tax positions		3	4
Total changes		3	4
Unrecognized tax benefits – December 31	10	13	10	6
Amount that if recognized, would affect the effective tax rate or regulatory liability		13
Duke Energy Florida
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		4	3	3
Gross increases – current period tax positions		1	1
Total changes		1	1
Unrecognized tax benefits – December 31	4	5	4	3
Amount that if recognized, would affect the effective tax rate or regulatory liability		5
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
Unrecognized tax benefits – December 31	1	1	1	1
Amount that if recognized, would affect the effective tax rate or regulatory liability		1
Duke Energy Indiana
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		2	1	1
Gross increases – current period tax positions			1
Total changes			1
Unrecognized tax benefits – December 31	2	2	2	1
Amount that if recognized, would affect the effective tax rate or regulatory liability		2
Piedmont
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		4	1	4
Gross increases – current period tax positions		5	3
Reduction due to lapse of statute of limitations				(3)
Total changes		5	3	(3)
Unrecognized tax benefits – December 31	$ 4	9	$ 4	$ 1
Amount that if recognized, would affect the effective tax rate or regulatory liability		$ 8