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Public Utilities, Estimated Capital Cost Excluding AFUDC

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Site Contingency, Environmental Remediation, Number of Sites

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period end amount of total net PPE.

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested return on equity.

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The total amount of operating revenues recognized during the period.

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The amount of operating expenses for the period that are associated with the utility's normal revenue producing operation; including selling, general, and administrative expenses, costs incurred for routine plant repairs and maintenance, and operations.

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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) $ in Millions				3 Months Ended			9 Months Ended
	Sep. 19, 2022 USD ($)	May 19, 2022 USD ($)	Oct. 01, 2021 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) site	Sep. 30, 2021 USD ($)	Apr. 27, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Operating Revenues				$ 7,968		$ 6,951	$ 21,785	$ 18,859
Incurred costs				1,394		1,507	4,471	4,319
Income Tax Expense From Continuing Operations				128		90	191	210
Impairment (reversal) of assets and other charges				(4)		211	202	342
Net property, plant and equipment				115,907	$ 111,408		115,907
Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Operating Revenues				628		506	1,811	1,494
Incurred costs				121		116	408	335
Income Tax Expense From Continuing Operations				17		$ 9	(30)	34
Impairment (reversal) of assets and other charges				(11)			(11)	$ 5
Net property, plant and equipment				9,080	8,625		9,080
Duke Energy Ohio \| Duke Energy Ohio Electric Base Rate Case \| PUCO
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 23		$ 55
Requested return on equity (as a percent)	9.50%		10.30%
Requested rate increase, percentage			3.30%
Duke Energy Ohio \| Duke Energy Ohio Electric Base Rate Case \| PUCO \| Minimum
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 2
Requested return on equity (as a percent)		8.84%
Duke Energy Ohio \| Duke Energy Ohio Electric Base Rate Case \| PUCO \| Maximum
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 15
Requested return on equity (as a percent)		9.85%
Duke Energy Ohio \| Natural Gas Pipeline extension \| OPSB
Public Utilities, General Disclosures [Line Items]
Estimated capital cost excluding AFUDC				170			$ 170
Duke Energy Ohio \| MGP Cost Recovery - 2009 Through 2012 \| PUCO
Public Utilities, General Disclosures [Line Items]
Number of environmental remediation sites \| site							2
Duke Energy Ohio \| MGP Cost Recovery - 2013 Through 2019 \| PUCO
Public Utilities, General Disclosures [Line Items]
Operating Revenues							$ 15
Incurred costs							58
Income Tax Expense From Continuing Operations							(72)
Duke Energy Ohio \| Midwest Propane Caverns
Public Utilities, General Disclosures [Line Items]
Impairment (reversal) of assets and other charges				$ (12)	$ 19		(12)
Net property, plant and equipment									$ 7
Duke Energy Ohio \| Duke Energy Ohio Gas Base Rate Case \| PUCO
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount							$ 49
Requested return on equity (as a percent)							10.30%
Requested rate increase, percentage							5.60%