Public Utilities, Disclosure Of Rate Matters, Rate Base

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Public Utilities, Disclosure Of Rate Matters, Rate Base Reduction due to Approved Return on Equity, Percent

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Public Utilities, Disclosure Of Rate Matters, Rate Base Reduction due to Depreciation Methodology, Percent

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Public Utilities, Disclosure Of Rate Matters, Rate Base Reduction due to Earnings Adjustments, Percent

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Public Utilities, Disclosure Of Rate Matters, Reduction of Requested Rate Increase

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Public Utilities, Requested Rate Increase (Decrease), Percentage, Net Of Tax

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Public Utilities, Return on Equity, Estimated Percentage of Total Rate Increase, Step One

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Public Utilities, Return on Equity, Estimated Percentage of Total Rate Increase, Step Two

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Percentage of public utility's approved equity to capital, including debt and equity.

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

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Percentage of public utility's approved return on equity.

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

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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 return on equity.

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The total amount of operating revenues recognized during the period.

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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - USD ($) $ in Millions					3 Months Ended
	Jul. 28, 2021	Jun. 29, 2020	Dec. 04, 2019	Jul. 02, 2019	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges					$ 215
Operating revenues					7,132	$ 6,150
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges					211
Operating revenues					822	$ 745
Duke Energy Indiana \| IURC \| Indiana rate case 2019
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				$ 395
Requested rate increase, percentage, net of tax			15.60%
Requested rate increase (decrease), amended amount			$ 396
Approved rate increase, amount		$ 146
Rate base							$ 10,200
Reduction of requested rate increase		$ 200
Reduction due to depreciation methodology		50.00%
Reduction due to approved return on equity		20.00%
Approved return on equity percentage	9.70%	9.70%
Requested return on equity, percent		10.40%
Reduction due to earnings adjustments		20.00%
Estimated percentage of total rate increase, step one		75.00%
Estimated percentage of total rate increase, step two	25.00%
Public utilities, approved equity capital structure, percentage	54.00%
Impairment of assets and other charges					211
Operating revenues					$ 46