Income Taxes (Narrative) (Details) $ in Millions	Mar. 31, 2024 USD ($)
Duke Energy Carolinas
Tax Credit Carryforward [Line Items]
Deferred tax asset	$ 107
Duke Energy Progress
Tax Credit Carryforward [Line Items]
Deferred tax asset	$ 14

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

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Balance Type:	debit
Period Type:	instant