Regulatory Matters (Duke Energy Carolinas Narrative) (Details) $ in Millions						7 Months Ended	11 Months Ended	12 Months Ended
	Oct. 06, 2022	Sep. 27, 2021 contention	Jul. 28, 2021	Jun. 07, 2021	Jun. 06, 2021	Dec. 31, 2025 USD ($)	Dec. 31, 2026 USD ($)	May 31, 2027	May 31, 2026 USD ($)	Jan. 18, 2026 USD ($)	May 31, 2025 USD ($)	Jan. 18, 2025 USD ($)	May 31, 2024 USD ($)	Jan. 18, 2024 USD ($)	Dec. 31, 2022
Nuclear Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Operating license extension (in years)															20 years
Oconee Nuclear Station Subsequent License Renewal | Duke Energy Carolinas | Nuclear Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Comment period (in years)			60 days
Number of contentions | contention		3
Oconee Nuclear Station Subsequent License Renewal | Duke Energy Carolinas | Oconee | Nuclear Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Operating license extension (in years)				20 years
Operating license (in years)				80 years	60 years
2022 North Carolina Rate Case | Duke Energy Carolinas | NCUC | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)							$ 823			$ 150		$ 172
Requested return on equity, percentage							15.70%
2022 North Carolina Rate Case | Duke Energy Carolinas | NCUC | Subsequent Event | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)														$ 501
2022 North Carolina Rate Case | Duke Energy Progress | NCUC
Public Utilities, General Disclosures [Line Items]
Proposed rate period (in years)	3 years
2022 North Carolina Rate Case | Duke Energy Progress | NCUC | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)						$ 615			$ 138		$ 151		$ 326
Requested return on equity, percentage								16.00%