Equity Return on Deferred Coal Ash Cost Future Cases

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Percentage of Total Capital allowed as distribution.

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Public Utilities, Regulatory Asset, Amount of Recovery Costs Amortization Period

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Public Utilities, Regulatory Asset, Amount of Recovery Costs Not Sought

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Required minimum equity capital structure percent

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- Definition

Reversal of Revenues

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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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-Name Accounting Standards Codification
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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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Percentage of public utility's requested debt to capital, including debt and equity.

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Percentage of public utility's requested equity to capital, including debt and equity.

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Regulatory Matters (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jan. 22, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges			$ 356	$ 984	$ (8)
Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Limit of total capital			30.00%
Impairment of assets and other charges			$ 25
Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Required minimum equity capital structure			35.00%
Duke Energy Carolinas and Duke Energy Progress \| CCR Settlement Agreement
Public Utilities, General Disclosures [Line Items]
Recovery costs not sought	$ 1,000
Recovery costs amortization period	5 years
Equity return on deferred coal ash cost future cases	1.50%
Duke Energy Carolinas and Duke Energy Progress \| CCR Settlement Agreement \| NCUC
Public Utilities, General Disclosures [Line Items]
Requested capital structure, percentage	48.00%
Requested debt structure, percentage	52.00%
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges			$ 227	476	17
Duke Energy Carolinas \| CCR Settlement Agreement
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges		$ 454
Reversal of regulated electric operating revenues		50
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges			$ 63	$ 499	$ 12
Duke Energy Progress \| CCR Settlement Agreement
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges		494
Reversal of regulated electric operating revenues		$ 102