Other Income and Expenses, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	$ 16	$ 32	$ 31
AFUDC equity	171	154	139
Post in-service equity returns	39	27	29
Nonoperating income, other	417	240	231
Other income and expense, net	643	453	430
Duke Energy Carolinas
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	4	4	1
AFUDC equity	65	62	42
Post in-service equity returns	21	17	20
Nonoperating income, other	180	94	88
Other income and expense, net	270	177	151
Progress Energy
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	8	8	11
AFUDC equity	51	42	66
Post in-service equity returns	16	8	7
Nonoperating income, other	140	71	57
Other income and expense, net	215	129	141
Duke Energy Progress
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	6	2
AFUDC equity	34	29	60
Post in-service equity returns	16	8	7
Nonoperating income, other	87	36	33
Other income and expense, net	143	75	100
Duke Energy Florida
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	2	6	11
AFUDC equity	16	12	6
Nonoperating income, other	53	35	31
Other income and expense, net	71	53	48
Duke Energy Ohio
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	4	4	10
AFUDC equity	7	7	13
Post in-service equity returns	1	1	1
Nonoperating income, other	6	4
Other income and expense, net	18	16	24
Duke Energy Indiana
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	6	6	10
AFUDC equity	27	23	18
Post in-service equity returns	1	1
Nonoperating income, other	8	7	13
Other income and expense, net	42	37	41
Piedmont
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	19	17	1
AFUDC equity	20	19
Nonoperating income, other	16	15	19
Other income and expense, net	$ 55	$ 51	$ 20