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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Progress) (Details)				3 Months Ended		7 Months Ended	9 Months Ended		11 Months Ended	12 Months Ended
	Mar. 28, 2024 USD ($) MW	Aug. 18, 2023 USD ($)	Apr. 26, 2023	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Apr. 30, 2024 USD ($)	Aug. 17, 2027 USD ($)	Aug. 17, 2026 USD ($)	May 31, 2026 USD ($)	Aug. 17, 2025 USD ($)	May 31, 2025 USD ($)	Aug. 17, 2024 USD ($)	Jan. 01, 2026 MW	Apr. 25, 2024 USD ($)
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges				$ (5,000,000)	$ 88,000,000		$ 39,000,000	$ 96,000,000
Operation, maintenance and other				1,409,000,000	1,428,000,000		4,108,000,000	4,113,000,000
Debt issuances				7,740,000,000			7,740,000,000
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges				(3,000,000)	24,000,000		6,000,000	31,000,000
Operation, maintenance and other				376,000,000	345,000,000		1,077,000,000	1,051,000,000
Debt issuances				$ 677,000,000			$ 677,000,000
Duke Energy Progress | Storm Recovery Bonds
Public Utilities, General Disclosures [Line Items]
Debt issuances																	$ 177,000,000
2022 North Carolina Rate Case | NCUC | Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Proposed rate period (in years)			3 years
Requested rate increase (decrease), amount									$ 326,000,000
Settlement rate, amount		$ 12,200,000,000
Settlement rate, period (in years)		3 years
Approved return on equity percentage (as a percent)		9.80%
Public utilities, approved equity capital structure, percentage (as a percent)		53.00%
Impairment of assets and other charges					28,000,000			28,000,000
Operation, maintenance and other					$ 8,000,000			$ 8,000,000
Approved rate increase (decrease), amount															$ 233,000,000
2022 North Carolina Rate Case | NCUC | Duke Energy Progress | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 615,000,000						$ 138,000,000		$ 151,000,000
Approved rate increase (decrease), amount										$ 494,000,000	$ 135,000,000		$ 126,000,000
2022 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Settlement rate, amount		$ 3,500,000,000
Person County Cycle CPCN Proceeding | NCUC | Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 98,000,000
Generation capacity (MW) | MW	1,360
Requested rate increase (decrease) (as a percent)	2.60%
Person County Cycle CPCN Proceeding | NCUC | NCEMC | Forecast
Public Utilities, General Disclosures [Line Items]
Generation capacity (MW) | MW																225
Person County Cycle CPCN Proceeding | NCEMC | Duke Energy Progress | Forecast
Public Utilities, General Disclosures [Line Items]
Generation capacity (MW) | MW																1,135

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