Public Utilities, Annual Rate Increase Cap, Percentage

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- Definition

Public Utilities, Base Rate Case Stay-Out, Period

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- Definition

Public Utilities, Estimated Capital Cost Excluding AFUDC

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- Definition

Public Utilities, Number of Conditions on Construction

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- Definition

Public Utilities, Number of Nuclear Generating Facilities Eligible for Funding

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Site Contingency, Environmental Remediation, Number of Sites

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of public utility's approved rate increase (decrease) by regulatory agency.

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- Definition

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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- Definition

Percentage of public utility's requested return on equity.

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- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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Regulatory Matters (Duke Energy Ohio Narrative) (Details) $ in Millions					3 Months Ended	12 Months Ended
	Dec. 28, 2021 USD ($)	Oct. 08, 2021 USD ($)	Oct. 01, 2021 USD ($)	Jun. 01, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) site	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jul. 23, 2020 USD ($)	Jan. 01, 2020 plant	Nov. 21, 2019 condition	Jul. 12, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 28, 2018 USD ($)
Public Utilities, General Disclosures [Line Items]
Regulatory assets					$ 14,637	$ 14,637	$ 14,062
Impairment of assets and other charges						356	984	$ (8)
Public utilities, property, plant and equipment, net					111,408	111,408	106,782
Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Number of nuclear generating facilities eligible for funding \| plant										2
Regulatory assets					707	707	649
Impairment of assets and other charges						25
Public utilities, property, plant and equipment, net					8,625	$ 8,625	8,009
Duke Energy Ohio Electric Base Rate Case \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)			$ 55
Requested return on equity, percentage			10.30%
Requested rate increase (decrease), percent			3.30%
MGP Cost Recovery - 2009 Through 2012 \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Number of environmental remediation sites \| site						2
Regulatory assets					55	$ 55
MGP Cost Recovery - 2013 Through 2017 \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets														$ 26
MGP Cost Recovery - 2018 \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets													$ 20
MGP Cost Recovery - 2019 \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets								$ 39
Duke Energy Kentucky Gas Base Rate Case \| KPSC \| Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)		$ 9		$ 15
Requested rate increase (decrease), percent				13.00%
Annual rate increase cap, percentage		5.00%
Base rate case-stay out period		4 years
Approved rate increase (decrease) amount by state commission	$ 9
Duke Energy Kentucky Gas Base Rate Case \| KPSC \| Duke Energy Kentucky \| Public Utilities, Natural Gas Base Rates
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), percent		9.375%
Duke Energy Kentucky Gas Base Rate Case \| KPSC \| Duke Energy Kentucky \| Public Utilities, Natural Gas Riders
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), percent		9.30%
Midwest Propane Caverns \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges					19
Public utilities, property, plant and equipment, net					6	6	$ 27
Minimum \| Natural Gas Pipeline Extension \| Ohio Power Siting Board \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Estimated capital cost excluding AFUDC					185	185
Number of conditions on construction \| condition											41
Maximum \| Natural Gas Pipeline Extension \| Ohio Power Siting Board \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Estimated capital cost excluding AFUDC					$ 195	$ 195
MGP Costs - Regulatory Disallowance \| MGP Cost Recovery - 2013 Through 2017 \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets														$ 12
MGP Costs - Regulatory Disallowance \| MGP Cost Recovery - 2018 \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets												$ 11
MGP Costs - Regulatory Disallowance \| MGP Cost Recovery - 2019 \| Public Utilities Commission Of Ohio \| Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Regulatory assets									$ 4