Regulatory Matters (Regulatory Matters Narrative - Duke Energy Progress) (Details) - USD ($) $ in Millions					3 Months Ended		7 Months Ended	9 Months Ended		11 Months Ended	12 Months Ended
	Aug. 18, 2023	May 31, 2023	Oct. 06, 2022	Sep. 01, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2025	Sep. 30, 2023	Sep. 30, 2022	Apr. 30, 2024	Aug. 17, 2027	Aug. 17, 2026	May 31, 2026	Aug. 17, 2025	May 31, 2025	Aug. 17, 2024
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges					$ 88	$ (4)		$ 96	$ 202
Operation, maintenance and other					1,428	1,308		4,113	4,223
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges					24			31	4
Operation, maintenance and other					$ 345	$ 350		1,051	$ 1,101
2022 North Carolina Rate Case | NCUC | Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Proposed rate period (in years)			3 years
Settlement rate, amount	$ 12,200
Settlement rate, period (in years)	3 years
Approved return on equity percentage (as a percent)	9.80%
Impairment of assets and other charges								28
Operation, maintenance and other								$ 8
2022 North Carolina Rate Case | NCUC | Duke Energy Progress | Equity
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)	53.00%
2022 North Carolina Rate Case | NCUC | Duke Energy Progress | Debt
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)	47.00%
2022 North Carolina Rate Case | NCUC | Duke Energy Progress | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount							$ 615						$ 138		$ 151
Approved rate increase (decrease), amount											$ 494	$ 135		$ 126
2022 North Carolina Rate Case | NCUC | Duke Energy Progress | Forecast | Subsequent event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount										$ 326
Approved rate increase (decrease), amount																$ 233
2022 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Settlement rate, amount	$ 3,500
2023 South Carolina Storm Securitization | Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Storm costs		$ 171
2022 South Carolina Rate Case | PSCSC | Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount				$ 52
2022 South Carolina Rate Case, Retail Rate Case | PSCSC | Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)				9.60%
Approved rate increase (decrease), amount				$ 36
2022 South Carolina Rate Case, Retail Rate Case | PSCSC | Duke Energy Progress | 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 | Duke Energy Progress | 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 | Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Deferred compliance costs period (in years)				7 years
Deferred compliance costs				$ 50