Regulatory Matters (Regulatory Matters Narrative - Duke Energy Progress) (Details) - Duke Energy Progress - USD ($) $ in Millions			6 Months Ended	7 Months Ended	10 Months Ended		11 Months Ended	12 Months Ended
	Oct. 06, 2022	Sep. 01, 2022	Dec. 31, 2025	Dec. 31, 2025	Apr. 30, 2026	Apr. 30, 2025	Apr. 30, 2024	May 31, 2027	May 31, 2026	May 31, 2025	May 31, 2024
2022 North Carolina Rate Case | NCUC
Public Utilities, General Disclosures [Line Items]
Proposed rate period (in years)	3 years
2022 North Carolina Rate Case | NCUC | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 587	$ 615	$ 140	$ 127			$ 138	$ 151
Requested return on equity (as a percent)			15.00%					16.00%
2022 North Carolina Rate Case | NCUC | Forecast | Subsequent event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount							$ 320				$ 326
2022 South Carolina Rate Case | PSCSC
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount		$ 52
2022 South Carolina Rate Case, Retail Rate Case | PSCSC
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount		$ 36
Approved return on equity percentage (as a percent)		9.60%
2022 South Carolina Rate Case, Retail Rate Case | PSCSC | Equity
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)		52.43%
2022 South Carolina Rate Case, Retail Rate Case | PSCSC | Debt
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)		47.57%
2022 South Carolina Rate Case, Coal Ash Basin Closure Costs | PSCSC
Public Utilities, General Disclosures [Line Items]
Deferred compliance costs period (in years)		7 years
Deferred compliance costs		$ 50