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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) - USD ($) $ in Millions						1 Months Ended
	Jan. 03, 2026	Oct. 02, 2025	Jun. 02, 2025	May 15, 2024	Oct. 12, 2023	Dec. 31, 2024	Apr. 30, 2024	Apr. 30, 2023	Sep. 30, 2025
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities						$ 1,421			$ 1,229
Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities						34			54
Duke Energy Ohio Gas Base Rate Case | PUCO | Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount								$ 32
Equity ratio (as a percent)								52.32%
Requested return on equity (as a percent)								9.60%
Duke Energy Ohio Energy Security Plan | PUCO | Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Settlement rate, period (in years)				3 years			3 years
Regulatory assets						30			0
Duke Energy Kentucky Electric Base Rate Case | KPSC | Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Equity ratio (as a percent)					52.145%
Approved rate increase (decrease), amount					$ 48
Duke Energy Kentucky Electric Base Rate Case | KPSC | Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities									$ 7
Duke Energy Kentucky Electric Base Rate Case | KPSC | Duke Energy Kentucky | Subsequent event
Public Utilities, General Disclosures [Line Items]
Equity ratio (as a percent)		52.73%
Refund period		60 days
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 Kentucky Electric Base Rate Case, Electric Base Rates | KPSC | Duke Energy Kentucky | Subsequent event
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)		9.80%
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 2024 Electric Base Rate Case | KPSC | Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 70
Duke Energy Kentucky 2025 Natural Gas Base Rate Case | KPSC | Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 26
Equity ratio (as a percent)			52.649%
Requested return on equity (as a percent)			10.75%
Requested rate increase, percentage, net of tax			17.00%
Duke Energy Kentucky 2025 Natural Gas Base Rate Case | KPSC | Duke Energy Kentucky | Subsequent event
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease), amount		$ 44
Duke Energy Kentucky 2025 Natural Gas Base Rate Case | KPSC | Duke Energy Kentucky | Subsequent event | Forecast
Public Utilities, General Disclosures [Line Items]
Equity ratio (as a percent)	52.649%
Approved rate increase (decrease), amount	$ 22
Approved return on equity percentage (as a percent)	9.80%
Duke Energy Kentucky 2025 Natural Gas Base Rate Case, Riders | KPSC | Duke Energy Kentucky | Subsequent event | Forecast
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)	9.70%

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