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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas and Duke Energy Progress) (Details) customer in Thousands, $ in Millions		1 Months Ended	3 Months Ended
	Apr. 14, 2026 USD ($)	Jan. 31, 2026 USD ($) customer	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Feb. 24, 2026	Dec. 31, 2025 USD ($)
Public Utilities, General Disclosures [Line Items]
Capital expenditures			$ 4,088	$ 3,148
Debt issuances			2,275
Regulatory liabilities			14,774			$ 15,682
Winter Storm Fern \| Subsequent event
Public Utilities, General Disclosures [Line Items]
Proposed cost restoration period	19 months
Duke Energy Carolinas and Duke Energy Progress \| Winter Storm Fern
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs		$ 287
Public Utilities, Number Of Customers Impacted \| customer		200
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Capital expenditures			1,474	1,019
Regulatory liabilities			7,333			7,609
Duke Energy Carolinas \| Winter Storm Fern
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs		$ 181
Regulatory assets			140
Duke Energy Carolinas \| Winter Storm Fern \| Subsequent event
Public Utilities, General Disclosures [Line Items]
Cost recovery request	$ 500
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Capital expenditures			990	$ 849
Regulatory liabilities			4,245			$ 4,807
Duke Energy Progress \| Winter Storm Fern
Public Utilities, General Disclosures [Line Items]
Total storm restoration costs		$ 106
Regulatory assets			$ 74
Duke Energy Progress \| Winter Storm Fern \| Subsequent event
Public Utilities, General Disclosures [Line Items]
Cost recovery request	$ 309
Applications To Combine Utilities \| NCUC \| Duke Energy Carolinas and Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Guarantee period					14 years
Shared benefits contribution period					6 years