Effective Income Tax Rate Reconciliation, State and Local Taxes, Increase (Reduction), Amount

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Penalty Assessed

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Public Utilities, Regulatory Asset, Amount of Recovery Costs Disallowed

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Public Utilities, Requested Rate Increase (Decrease), Gross Amount

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Public Utilities, Requested Rate Increase (Decrease), Rider Reduction

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Recovery Costs Reduction

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- Definition

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

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

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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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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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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 rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested return on equity.

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- Definition

Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Amount of income tax benefit for remeasurement of deferred tax liability from change in tax rate pursuant to Tax Cuts and Jobs Act.

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Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act.

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Regulatory Matters (Duke Energy Carolinas Narrative) (Details) - USD ($) $ in Millions									3 Months Ended	12 Months Ended
	Oct. 26, 2020	Jul. 31, 2020	Sep. 30, 2019	May 21, 2019	Nov. 08, 2018	Jun. 22, 2018	Feb. 28, 2018	Aug. 25, 2017	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Public Utilities, General Disclosures [Line Items]
Impairment charges										$ 984	$ (8)	$ 402
Regulatory assets										14,062	15,018
AROs – coal ash
Public Utilities, General Disclosures [Line Items]
Regulatory assets										3,408	4,084
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Impairment charges										476	17	$ 192
Regulatory assets										3,469	3,910
Duke Energy Carolinas \| AROs – coal ash
Public Utilities, General Disclosures [Line Items]
Regulatory assets										$ 1,414	$ 1,696
Duke Energy Carolinas \| NCUC \| 2017 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)								$ 647
Requested return on equity, percentage							9.90%
Requested capital structure, percentage							52.00%
Requested debt structure, percentage							48.00%
Impairment charges						$ 150			$ 14
Management penalty assessed						70
Recovery costs reduction						$ 14
Recovery period						5 years
Duke Energy Carolinas \| NCUC \| 2019 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)			$ 291
Requested rate increase (decrease), percent			6.00%
Requested gross rate case revenue increase			$ 445
Requested EDIT rider decrease			$ 154
Duke Energy Carolinas \| North Carolina Utilities Commission
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amended, amount	$ 287
Duke Energy Carolinas \| North Carolina Utilities Commission \| 2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Requested return on equity, percentage		9.60%
Requested capital structure, percentage		52.00%
Requested debt structure, percentage		48.00%
Requested rate increase (decrease), amended, amount		$ 800
Duke Energy Carolinas \| North Carolina Utilities Commission \| 2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement, Estimated Annual Revenue Requirement
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amended, amount		$ 45
Duke Energy Carolinas \| PSCSC \| 2018 South Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)					$ 168
Approved return on equity, percentage				9.50%
Approved capital structure, percentage				53.00%
Approved debt structure, percentage				47.00%
Tax benefit from change in enacted tax rates				$ (66)
Measurement period adjustment				$ (45)
Duke Energy Carolinas \| PSCSC \| 2018 South Carolina Rate Case \| Deferred project costs
Public Utilities, General Disclosures [Line Items]
Recovery period				12 years
Regulatory assets				$ 125
Duke Energy Carolinas \| PSCSC \| 2018 South Carolina Rate Case \| AROs – coal ash
Public Utilities, General Disclosures [Line Items]
Regulatory assets				96
Denied recovery costs				115
Duke Energy Carolinas \| PSCSC \| 2018 South Carolina Rate Case \| State \| North Carolina DOR
Public Utilities, General Disclosures [Line Items]
Approved decrease through EDIT Rider				$ 17