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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
	Oct. 01, 2021 USD ($)	Mar. 31, 2022 USD ($) site	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Apr. 27, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Operating revenues		$ 7,132		$ 6,150
Incurred costs		1,630		1,402
Income Tax (Benefit) Expense		(14)		84
Impairment of assets and other charges		215
Public utilities, property, plant and equipment, net		112,316	$ 111,408
Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Operating revenues		638		532
Incurred costs		178		108
Income Tax (Benefit) Expense		(56)		$ 14
Public utilities, property, plant and equipment, net		8,716	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 \| Natural Gas Pipeline extension \| OPSB
Public Utilities, General Disclosures [Line Items]
Estimated capital cost excluding AFUDC		$ 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 (Benefit) Expense		$ (72)
Duke Energy Ohio \| Midwest Propane Caverns
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges			$ 19
Duke Energy Ohio \| Midwest Propane Caverns \| Subsequent event
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net					$ 7