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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) - USD ($) $ in Millions			1 Months Ended
	Apr. 30, 2025	Oct. 12, 2023	Dec. 31, 2024	Apr. 30, 2024	Apr. 30, 2023	Mar. 31, 2025
Duke Energy Ohio Gas Base Rate Case | PUCO | Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount					$ 32
Requested return on equity (as a percent)					9.60%
Duke Energy Ohio Gas Base Rate Case | PUCO | Duke Energy Ohio | Maximum
Public Utilities, General Disclosures [Line Items]
Equity ratio (as a percent)					52.32%
Duke Energy Kentucky Electric Base Rate Case | KPSC | Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount		$ 48
Duke Energy Kentucky Electric Base Rate Case | KPSC | Duke Energy Ohio | Maximum
Public Utilities, General Disclosures [Line Items]
Equity ratio (as a percent)		52.145%
Duke Energy Kentucky Electric Base Rate Case, Electric Riders | KPSC | Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)		9.65%
Duke Energy Kentucky Electric Base Rate Case, Electric Base Rates | KPSC | Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)		9.75%
Duke Energy Ohio Energy Security Plan | PUCO | Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Settlement rate, period (in years)				3 years
Regulatory assets			$ 30			$ 24
Duke Energy Ohio Energy Security Plan | PUCO | Duke Energy Ohio | Subsequent event
Public Utilities, General Disclosures [Line Items]
Settlement rate, period (in years)	3 years
Review period	10 days
Approval period	90 days
Duke Energy Kentucky 2024 Electric Base Rate Case | KPSC | Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 70
Requested return on equity (as a percent)			10.85%
Equity ratio (as a percent)			52.728%
Requested rate increase, percentage, net of tax			14.70%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478742/980-340-50-1

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