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

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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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Percentage of public utility's approved debt 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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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 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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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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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) $ in Millions												3 Months Ended		9 Months Ended
	Sep. 27, 2021 contention	Jul. 28, 2021	Jun. 07, 2021	Jun. 06, 2021	May 21, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2019 USD ($)	May 21, 2019 USD ($)	Nov. 08, 2018 USD ($)	Feb. 28, 2018	Aug. 25, 2017 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges												$ 211	$ 28	$ 342	$ 36
Other income and expenses, net												238	127	$ 493	310
Nuclear Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Operating license extension														20 years
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges												163	$ 20	$ 238	$ 22
Duke Energy Carolinas \| NCUC \| 2017 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount											$ 647
Requested return on equity, percent										9.90%
Public utilities, requested equity capital structure, percentage										52.00%
Public utilities, requested debt capital structure, percentage										48.00%
Duke Energy Carolinas \| NCUC \| 2019 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount							$ 291
Requested rate increase, percentage							6.00%
Requested rate increase (decrease), gross amount							$ 445
Requested rate increase (decrease), rider reduction							$ 154
Duke Energy Carolinas \| NCUC \| 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage						9.60%
Public utilities, approved equity capital structure, percentage						52.00%
Public utilities, approved debt capital structure, percentage						48.00%
Approved rate increase, amount					$ 33
Duke Energy Carolinas \| PSCSC \| South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount									$ 168
Approved return on equity percentage								9.50%
Public utilities, approved equity capital structure, percentage								53.00%
Public utilities, approved debt capital structure, percentage								47.00%
Change in tax rate, deferred tax liability, income tax benefit								$ 66
Measurement period adjustment, income tax expense (benefit)								$ 45
Duke Energy Carolinas \| PSCSC \| South Carolina Rate Case 2018 \| North Carolina Department of Revenue \| State and local jurisdiction
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period								5 years
State and local taxes reduction amount								$ 17
Duke Energy Carolinas \| Nuclear Regulatory Commission \| Oconee Nuclear Station Subsequent License Renewal
Public Utilities, General Disclosures [Line Items]
Comment period		60 days
Number of contentions \| contention	3
Duke Energy Carolinas \| Nuclear Regulatory Commission \| Oconee Nuclear Station Subsequent License Renewal \| Oconee Nuclear Station
Public Utilities, General Disclosures [Line Items]
Operating license extension			20 years
Operating license			80 years	60 years
Duke Energy Carolinas \| Grid Improvement \| NCUC \| 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Regulatory assets						$ 800
Duke Energy Carolinas \| Storm costs \| NCUC \| 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Regulatory assets						$ 213
Duke Energy Carolinas \| Deferred project costs \| PSCSC \| South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory assets								$ 125
Regulatory asset, amortization period								12 years
Duke Energy Carolinas \| Asset retirement obligations - coal ash \| PSCSC \| South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory assets								$ 96
Regulatory asset, amortization period								5 years
Recovery costs denied								$ 115
Impairment of assets and other charges												160		160
Other income and expenses, net												$ 31		$ 31
Duke Energy Carolinas \| Asset retirement obligations - unprotected EDIT, Property, Plant and Equipment \| PSCSC \| South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period								20 years
Duke Energy Carolinas \| Asset retirement obligations - unprotected EDIT \| PSCSC \| South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period								5 years
Duke Energy Carolinas \| Asset retirement obligations - deferred revenue \| PSCSC \| South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period								5 years