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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			6 Months Ended
	May 19, 2022 USD ($)	Oct. 01, 2021 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) site	Jun. 30, 2021 USD ($)	Apr. 27, 2022 USD ($)	Dec. 31, 2021 USD ($)
Public Utilities, General Disclosures [Line Items]
Operating Revenues			$ 6,685		$ 5,758	$ 13,817	$ 11,908
Incurred costs			1,447		1,410	3,077	2,812
Income Tax Expense			77		36	63	120
Impairment of assets and other charges			(9)		131	206	131
Net property, plant and equipment			113,851			113,851			$ 111,408
Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Operating Revenues			545		456	1,183	988
Incurred costs			109		111	287	219
Income Tax Expense			9		11	(47)	25
Impairment of assets and other charges					$ 5		$ 5
Net property, plant and equipment			8,866			8,866			$ 8,625
Duke Energy Ohio \| Duke Energy Ohio Electric Base Rate Case \| PUCO
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 55
Requested return on equity, percent		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, 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, percent	9.85%
Duke Energy Ohio \| Natural Gas Pipeline extension \| OPSB
Public Utilities, General Disclosures [Line Items]
Estimated capital cost excluding AFUDC			$ 185			$ 185
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						(72)
Duke Energy Ohio \| Midwest Propane Caverns
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges				$ 19
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, percent						10.30%
Requested rate increase, percentage						5.60%