Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) - Nuclear Regulatory Commission - contention					3 Months Ended
	Sep. 27, 2021	Jul. 28, 2021	Jun. 07, 2021	Jun. 06, 2021	Mar. 31, 2022
Public Utilities, General Disclosures [Line Items]
Operating license extension					20 years
Duke Energy Carolinas | Oconee Nuclear Station Subsequent License Renewal
Public Utilities, General Disclosures [Line Items]
Comment period		60 days
Number of contentions	3
Duke Energy Carolinas | Oconee Nuclear Station Subsequent License Renewal | Oconee Nuclear Station
Public Utilities, General Disclosures [Line Items]
Operating license extension			20 years
Operating license			80 years	60 years