Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas and Duke Energy Progress) (Details) customers in Thousands, $ in Millions					3 Months Ended	9 Months Ended
	Sep. 27, 2021 contention	Jul. 28, 2021	Jun. 07, 2021	Jun. 06, 2021	Sep. 30, 2024 USD ($) customers	Sep. 30, 2024 USD ($) customers	Aug. 31, 2024 customers	Dec. 31, 2023 USD ($)
Public Utilities, General Disclosures [Line Items]
Regulatory assets					$ 13,778	$ 13,778		$ 13,618
Hurricanes Helene, Debby and Milton \| Minimum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						2,400
Hurricanes Helene, Debby and Milton \| Maximum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						$ 2,900
Hurricane Helene
Public Utilities, General Disclosures [Line Items]
Number of impacted customers \| customers					3,500	3,500
Capital investments					$ 112
Storm restoration costs incurred						$ 582
Regulatory assets					451	451
Hurricane Helene \| Minimum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						1,500
Hurricane Helene \| Maximum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						1,900
Hurricane Debby
Public Utilities, General Disclosures [Line Items]
Number of impacted customers \| customers							700
Capital investments					11
Storm restoration costs incurred						150
Regulatory assets					90	90
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Regulatory assets					3,867	3,867		3,916
Duke Energy Carolinas \| Hurricanes Helene, Debby and Milton \| Minimum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						950
Duke Energy Carolinas \| Hurricanes Helene, Debby and Milton \| Maximum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						1,150
Duke Energy Carolinas \| Hurricane Helene
Public Utilities, General Disclosures [Line Items]
Storm restoration costs incurred						261
Regulatory assets					177	177
Duke Energy Carolinas \| Hurricane Helene \| Minimum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						900
Duke Energy Carolinas \| Hurricane Helene \| Maximum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						1,100
Duke Energy Carolinas \| Hurricane Debby
Public Utilities, General Disclosures [Line Items]
Storm restoration costs incurred						45
Regulatory assets					23	23
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Regulatory assets					4,489	4,489		4,546
Duke Energy Progress \| Hurricanes Helene, Debby and Milton \| Minimum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						350
Duke Energy Progress \| Hurricanes Helene, Debby and Milton \| Maximum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						450
Duke Energy Progress \| Hurricane Helene
Public Utilities, General Disclosures [Line Items]
Storm restoration costs incurred						51
Regulatory assets					34	34
Duke Energy Progress \| Hurricane Helene \| Minimum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						300
Duke Energy Progress \| Hurricane Helene \| Maximum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						400
Duke Energy Progress \| Hurricane Debby
Public Utilities, General Disclosures [Line Items]
Storm restoration costs incurred						45
Regulatory assets					13	13
Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Regulatory assets					2,071	2,071		$ 1,883
Duke Energy Florida \| Hurricanes Helene, Debby and Milton \| Minimum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						1,100
Duke Energy Florida \| Hurricanes Helene, Debby and Milton \| Maximum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						1,300
Duke Energy Florida \| Hurricane Helene
Public Utilities, General Disclosures [Line Items]
Storm restoration costs incurred						251
Regulatory assets					236	236
Duke Energy Florida \| Hurricane Helene \| Minimum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						300
Duke Energy Florida \| Hurricane Helene \| Maximum
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs						400
Duke Energy Florida \| Hurricane Debby
Public Utilities, General Disclosures [Line Items]
Storm restoration costs incurred						60
Regulatory assets					$ 54	$ 54
Nuclear Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Operating license extension (in years)						20 years
Oconee Nuclear Station Subsequent License Renewal \| Nuclear Regulatory Commission \| Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Comment period (in days)		60 days
Number of contentions \| contention	3
Oconee Nuclear Station Subsequent License Renewal \| Oconee Nuclear Station \| Nuclear Regulatory Commission \| Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Operating license extension (in years)			20 years
Operating license (in years)			80 years	60 years