Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) - 2023 North Carolina Rate Case - NCUC - Duke Energy Carolinas - USD ($) $ in Millions		11 Months Ended	12 Months Ended
	Jan. 19, 2023	Dec. 31, 2026	Jan. 18, 2026	Jan. 18, 2025	Jan. 18, 2024
Public Utilities, General Disclosures [Line Items]
Proposed rate period (in years)	3 years
Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 823	$ 150	$ 172
Requested return on equity (as a percent)		15.70%
Forecast | Subsequent event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount					$ 501