Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Investment, Name [Axis]
Investment, Name [Axis]
Investment, Name [Domain]
Investment, Name [Domain]
National Methanol Company [Member]
National Methanol Company [Member]
National Methanol Company [Member]
Nonregulated Retired Facility Sale [Axis]
Nonregulated Retired Facility Sale [Axis]
Sale of a nonregulated retired facility.
Nonregulated Retired Facility Sale [Domain]
Nonregulated Retired Facility Sale [Domain]
[Domain] for Sale of a nonregulated retired facility.
Beckjord [Member]
Beckjord [Member]
Beckjord nonregulated facility.
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
Duke Energy Ohio [Member]
Duke Energy Ohio [Member]
Duke Energy Ohio
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Ownership percentage
Equity Method Investment, Ownership Percentage
Pretax loss on disposal
Gain (Loss) on Disposition of Assets
Operation, maintenance and other
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses
Number of reportable segments
Number of Reportable Segments
Related Party Transactions [Abstract]
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Related Party [Axis]
Related Party [Axis]
Related Party [Domain]
Related Party [Domain]
Affiliated Entity [Member]
Affiliated Entity [Member]
Duke Energy Carolinas [Member]
Duke Energy Carolinas [Member]
Duke Energy Carolinas
Progress Energy [Member]
Progress Energy [Member]
Progress Energy
Duke Energy Progress [Member]
Duke Energy Progress [Member]
Duke Energy Progress
Duke Energy Florida [Member]
Duke Energy Florida [Member]
Duke Energy Florida
Duke Energy Indiana [Member]
Duke Energy Indiana [Member]
Duke Energy Indiana
Piedmont Natural Gas [Member]
Piedmont Natural Gas [Member]
Piedmont Natural Gas
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Income taxes receivable
Income Taxes Receivable, Current
Income tax payable
Accrued Income Taxes, Current
Variable Interest Entities [Abstract]
Variable Interest Entities [Abstract]
Variable Interest Entities
Variable Interest Entity Disclosure [Text Block]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization And Basis Of Presentation [Table]
Organization And Basis Of Presentation [Table]
Schedule reflecting the orgnaization and basis of presentation.
Organization And Basis Of Presentation [Line Items]
Organization And Basis Of Presentation [Line Items]
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.
Schedule of Cash, Cash Equivalents and Restricted Cash
Schedule of Cash and Cash Equivalents [Table Text Block]
Schedule of Utility Inventory
Schedule of Utility Inventory [Table Text Block]
Schedule of Excise Taxes
Schedule Of Excise Taxes [Table Text Block]
Schedule of excise taxes accounted for on a gross basis during the reporting period.
Schedule of New Accounting Pronouncements
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
Equity [Abstract]
Schedule Of Earnings Per Share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Investments, Debt and Equity Securities [Abstract]
Investments In Debt And Equity Securities
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Statement of Financial Position [Abstract]
Statement [Table]
Statement [Table]
Counterparty Name [Axis]
Counterparty Name [Axis]
Counterparty Name [Domain]
Counterparty Name [Domain]
Variable Interest Entity [Member]
Variable Interest Entity [Member]
Variable Interest Entity [Member]
Statement [Line Items]
Statement [Line Items]
Allowance for doubtful accounts - receivables
Allowance for Doubtful Accounts and Other Receivables, Current
Amount of allowance related to receivables from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer, that are expected to be uncollectible.
Allowance for doubtful accounts - receivables of VIEs
Allowance for Doubtful Accounts Receivable, Current
Regulatory assets, current
Regulatory Assets, Current
Other, current assets
Prepaid Expense and Other Assets, Current
Regulatory assets, noncurrent
Regulatory Assets, Noncurrent
Current maturities of long-term debt
Long-term Debt, Current Maturities
Long-Term Debt
Long-term Debt, Excluding Current Maturities
Common stock, par value
Common Stock, Par or Stated Value Per Share
Common stock, shares authorized
Common Stock, Shares Authorized
Common stock, shares outstanding
Common Stock, Shares, Outstanding
Schedule of Cash and Cash Equivalents [Table]
Schedule of Cash and Cash Equivalents [Table]
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents [Line Items]
Current Assets
Assets, Current [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Other
Restricted Cash and Cash Equivalents, Current
Other Noncurrent Assets
Other Assets, Noncurrent [Abstract]
Other
Restricted Cash and Cash Equivalents, Noncurrent
Total cash, cash equivalents and restricted cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations [Table]
Asset Retirement Obligations [Table]
Information and financial data about asset retirement obligations.
ARO Balance Category [Axis]
ARO Balance Category [Axis]
ARO Balance Category [Axis]
ARO Balance Category [Domain]
ARO Balance Category [Domain]
[Domain] for ARO Balance Category [Axis]
Decommissioning of Nuclear Power Facilities [Member]
Decommissioning of Nuclear Power Facilities [Member]
Decommissioning of Nuclear Power Facilities [Member]
Closure of Ash Impoundments [Member]
Closure of Ash Basins [Member]
Closure of Ash Basins [Member]
Other [Member]
Other [Member]
Other [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligations [Line Items]
[Line Items] for Information and financial data about asset retirement obligations.
Total ARO
Asset Retirement Obligation
Less: current portion
Asset Retirement Obligation, Current
Total noncurrent ARO
Asset Retirement Obligations, Noncurrent
Business Segment Data
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Award Type [Axis]
Award Type [Axis]
Equity Award [Domain]
Equity Award [Domain]
Restricted Stock Units Awards [Member]
Restricted Stock Units (RSUs) [Member]
Performance Awards [Member]
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax stock-based compensation cost
Allocated Share-based Compensation Expense
Stock-based compensation costs capitalized
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount
Stock-based compensation expense
Allocated Share-based Compensation Expense, Net of Tax
Tax benefit associated with stock-based compensation expense
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense
Commitments and Contingencies Disclosure [Abstract]
Loss Contingencies [Table]
Loss Contingencies [Table]
Environmental Matters Details [Line Items]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies [Roll Forward]
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of period
Accrual for Environmental Loss Contingencies
Provisions/adjustments
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)
Cash reductions
Accrual for Environmental Loss Contingencies, Payments
Balance at end of period
Environmental exit costs, reasonably possible additional loss
Environmental Exit Costs, Reasonably Possible Additional Loss
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative [Table]
Derivative [Table]
Derivative [Line Items]
Derivative [Line Items]
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Description of Credit Risk Related Contingent Features [Abstract]
Aggregate fair value amounts of derivative instruments in a net liability position
Derivative, Net Liability Position, Aggregate Fair Value
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered
Additional Collateral, Aggregate Fair Value
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Consolidated Entities [Domain]
Consolidated Entities [Domain]
Parent Company [Member]
Parent Company [Member]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Unsecured Debt [Member]
Unsecured Debt [Member]
First Mortgage Bonds [Member]
First Mortgage [Member]
Other debt obligations [Member]
Other Debt Obligations [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument Name [Domain]
Debt Instrument, Name [Domain]
Debt Maturing March 2019, 7.050% Coupon [Member]
Debt Maturing March 2019, 7.050% Coupon [Member]
Debt Maturing March 2019, 7.050% Coupon [Member]
Debt Maturing September 2019, 5.050% Coupon [Member]
Debt Maturing September 2019, 5.050% Coupon [Member]
Debt Maturing September 2019, 5.050% Coupon [Member]
Debt Maturing September 2019, 2.848% Coupon [Member]
Debt Maturing September 2019, 2.848% Coupon [Member]
Debt Maturing September 2019, 2.848% Coupon [Member]
Bonds Maturing November 2018, 7.000% Coupon [Member]
First Mortgage Bonds Maturing November 2018 7.000% Coupon [Member]
First Mortgage Bonds Maturing November 2018 7.000% Coupon [Member]
Bonds Maturing January 2019, 5.300% Coupon [Member]
Bonds Maturing January 2019, 5.300% Coupon [Member]
Bonds Maturing January 2019, 5.300% Coupon [Member]
Bonds Maturing April 2019, 5.450% Coupon [Member] [Member]
Bonds Maturing April 2019, 5.450% Coupon [Member] [Member]
Bonds Maturing April 2019, 5.450% Coupon
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Interest rate
Debt Instrument, Interest Rate, Stated Percentage
Related Party Transactions
Related Party Transactions Disclosure [Text Block]
Line of Credit Facility [Table]
Line of Credit Facility [Table]
Proceeds Loaned To Subsidiary Registrants [Member]
Proceeds Loaned To Subsidiary Registrants [Member]
Proceeds Loaned To Subsidiary Registrants
Credit Facility [Axis]
Credit Facility [Axis]
Credit Facility [Domain]
Credit Facility [Domain]
Revolving Credit Facility [Member]
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility [Line Items]
Facility size
Line of Credit Facility, Maximum Borrowing Capacity
Commercial paper
Long-term Commercial Paper
Outstanding letters of credit
Letters of Credit Outstanding, Amount
Tax exempt bonds
Long-term Pollution Control Bond
Coal ash set-aside
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases
Available capacity
Line of Credit Facility, Remaining Borrowing Capacity
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Current Assets, Other [Member]
Other Current Assets [Member]
Tax receivable
Tax Cuts And Jobs Act Of 2017, Tax Receivable
Tax Cuts And Jobs Act Of 2017, Tax Receivable
Public Utilities, Inventory [Table]
Public Utilities, Inventory [Table]
Inventory [Axis]
Inventory [Axis]
Inventory [Domain]
Inventory [Domain]
Materials and supplies [Member]
Supplies [Member]
Coal [Member]
Coal [Member]
Natural gas, oil and other fuel [Member]
Public Utilities, Inventory, Fuel [Member]
Public Utilities, Inventory [Line Items]
Public Utilities, Inventory [Line Items]
Inventory
Public Utilities, Inventory
Significant Accounting Policies Registrants [Table]
Significant Accounting Policies Registrants [Table]
Presents significant accounting policies information by registrant.
Policy Text Block [Line Items]
Policy Text Block [Line Items]
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.
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Consolidation
Consolidation, Policy [Policy Text Block]
Use of Estimates
Use of Estimates, Policy [Policy Text Block]
Cash, Cash Equivalents, and Restricted Cash
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]
Inventory
Inventory, Policy [Policy Text Block]
New Accounting Standards
New Accounting Pronouncements, Policy [Policy Text Block]
Environmental Costs
Environmental Costs, Policy [Policy Text Block]
Derivatives
Derivatives, Policy [Policy Text Block]
Investments
Investment, Policy [Policy Text Block]
Revenue from Contract with Customer
Revenue from Contract with Customer [Policy Text Block]
Earnings Per Share
Earnings Per Share, Policy [Policy Text Block]
Stock-based Compensation
Compensation Related Costs, Policy [Policy Text Block]
Retirement Benefits [Abstract]
Schedule of Defined Benefit Plans Disclosures [Table]
Schedule of Defined Benefit Plans Disclosures [Table]
Retirement Plan Type [Axis]
Retirement Plan Type [Axis]
Retirement Plan Type [Domain]
Retirement Plan Type [Domain]
Qualified Pension Plan [Member]
Pension Plan [Member]
Non-Qualified Pension Plan [Member]
Other Pension Plan [Member]
Other Post-Retirement Benefit Plans [Member]
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost
Defined Benefit Plan, Service Cost
Interest cost on projected benefit obligation
Defined Benefit Plan, Interest Cost
Expected return on plan assets
Defined Benefit Plan, Expected Return (Loss) on Plan Assets
Amortization of actuarial loss (gain)
Defined Benefit Plan, Amortization of Gain (Loss)
Amortization of prior service (credit) cost
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Other
Defined Benefit Plan, Other Cost (Credit)
Net periodic costs
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Regulated Operations [Abstract]
Schedule of Potential Plant Retirements
Public Utility Property, Plant, and Equipment [Table Text Block]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Minimum [Member]
Minimum [Member]
Maximum [Member]
Maximum [Member]
Loss Contingency Nature [Axis]
Loss Contingency Nature [Axis]
Loss Contingency, Nature [Domain]
Loss Contingency, Nature [Domain]
Coal Ash Insurance Coverage Litigation [Member]
Coal Ash Insurance Coverage Litigation [Member]
Coal Ash Insurance Coverage Litigation [Member]
NCDEQ State Enforcement Actions [Member]
NCDEQ State Enforcement Actions [Member]
North Carolina Department of Environmental Quality State Enforcement Actions [Member]
Groundwater Contamination Claims [Member]
Groundwater Contamination Claims [Member]
Groundwater Contamination Claims [Member]
Asbestos-related Injuries and Damages Claims [Member]
Asbestos Issue [Member]
Spent Nuclear Fuels [Member]
Spent Nuclear Fuels [Member]
Spent Nuclear Fuels
Gypsum Supply Agreements [Member]
Gypsum Supply Agreements [Member]
Gypsum Supply Agreements [Member]
Westinghouse Electric Company Litigation [Member]
Westinghouse Electric Company Litigation [Member]
Westinghouse Electric Company Litigation
MGP Cost Recovery Action [Member]
MGP Cost Recovery Action [Member]
MGP Cost Recovery Action [Member]
Litigation Case [Axis]
Litigation Case [Axis]
Litigation Case Type [Domain]
Litigation Case [Domain]
Non-Malignant Asbestos Claim [Member]
Non Malignant Asbestos Claim [Member]
Asbestos claims that relate to a non-malignant diagnosis
Malignant Asbestos Claim [Member]
Malignant Asbestos Claim [Member]
Asbestos claims that relate to a malignant diagnosis
Loss Contingencies [Line Items]
Valuation and Qualifying Accounts [Abstract]
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Number of NC and SC plants with ash basins
Number of NC and SC Plants with Ash Basins
Number of NC and SC Plants with Ash Basins with insurance claims being sought
Number of plants with no disputed facts
Number of Plants with No Disputed Facts
Number of Plants with No Disputed Facts due to litigation being concluded
Number of NC plants with ash basins
Number of NC Plants with Ash Basins
Number of NC Plants with Ash Basins requiring additional monitoring and assessment
Number of plants with disputed facts
Number of Plants with Disputed Facts
Number of Plants with Disputed Facts
Goodwill payment
Goodwill Payment
Goodwill Payment to neighbors of ash basins
Water bill stipend period
Water Bill Stipend Period
Water Bill Stipend Period for ash basin neighbors
Loss contingency accrual
Loss Contingency Accrual
Loss contingency, pending claims, number
Loss Contingency, Pending Claims, Number
Asbestos-related injuries and damages reserves
Liability for Asbestos and Environmental Claims, Gross
Reinsurance retention policy, excess retention, amount reinsured
Reinsurance Retention Policy, Excess Retention, Amount Reinsured
Probable insurance recoveries
Loss Contingency, Receivable, Noncurrent
Minimum amount of gypsum to be supplied
Minimum Amount of Gypsum To Be Supplied
Minimum Amount of Gypsum To Be Supplied Monthly To Third Party Under Supply Agreement
Estimate of possible losses
Loss Contingency, Estimate of Possible Loss
Gain contingency, unrecorded amount
Gain Contingency, Unrecorded Amount
Litigation settlement, amount awarded from other party
Litigation Settlement, Amount Awarded from Other Party
Loss contingency, damages sought, original amount
Loss Contingency, Damages Sought, Original Amount
Loss Contingency, Damages Sought, Original Amount
Loss contingency, damages awarded, value
Loss Contingency, Damages Awarded, Value
Gain contingency, dismissed amount
Gain Contingency, Dismissed Amount
Gain Contingency, Dismissed Amount
Loss contingency damages awarded and interest, value
Loss Contingency Damages Awarded and Interest, Value
Loss Contingency Damages Awarded and Interest, Value
Loss contingency, damages paid, value
Loss Contingency, Damages Paid, Value
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Business Acquisition [Axis]
Business Acquisition [Axis]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Piedmont Natural Gas and Progress Energy [Member]
Piedmont Natural Gas And Progress Energy [Member]
Piedmont Natural Gas and Progress Energy [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value
Long-term Debt
Long-term debt, fair value
Long-term Debt, Fair Value
Unamortized debt discount (premium), net
Debt Instrument, Unamortized Discount (Premium), Net
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Quantitative Information Table - Level 3
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]
Schedule Of Long Term Debt Fair Value
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
Schedule of Available-for-sale Securities [Table]
Schedule of Available-for-sale Securities [Table]
Investment Secondary Categorization [Axis]
Investment Secondary Categorization [Axis]
Investments by Secondary Categorization [Domain]
Investments by Secondary Categorization [Domain]
Ndtf [Member]
Ndtf [Member]
NDTF [Member]
Other Classification [Member]
Other Classification [Member]
Other Investment Classification. This includes all investments not held within the Nuclear decomissioning trust fund and the Duke Energy Indiana Grantor Trust.
Financial Instrument [Axis]
Financial Instrument [Axis]
Financial Instruments [Domain]
Financial Instruments [Domain]
Cash and Cash Equivalents [Member]
Cash and Cash Equivalents [Member]
Equity Securities [Member]
Equity Securities [Member]
Corporate debt securities [Member]
Corporate Debt Securities [Member]
Municipal bonds [Member]
Municipal Bonds [Member]
US treasury and government [Member]
US Treasury and Government [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Holding Gains
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax
Gross Unrealized Holding Losses
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax
Estimated Fair Value
Available-for-sale Securities
Realized Gains
Available-for-sale Securities, Gross Realized Gains
Realized Losses
Available-for-sale Securities, Gross Realized Losses
Statement of Stockholders' Equity [Abstract]
Dividend to parent related to a legal entity restructuring
Dividends, Common Stock, Paid-in-kind
Variable Interest Entities [Axis]
Variable Interest Entities [Axis]
Variable Interest Entity, Classification [Domain]
Variable Interest Entity, Classification [Domain]
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity, Primary Beneficiary [Member]
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Designated as Hedging Instrument [Member]
Designated as Hedging Instrument [Member]
Not Designated as Hedging Instrument [Member]
Not Designated as Hedging Instrument [Member]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Commodity Contracts [Member]
Price Risk Derivative [Member]
Interest Rate Contracts [Member]
Interest Rate Contract [Member]
Public Utility [Axis]
Public Utility [Axis]
Utility Plant [Domain]
Utility Plant [Domain]
Electricity [Member]
Electric Transmission [Member]
Natural Gas [Member]
Gas Distribution [Member]
Notional amount
Derivative, Notional Amount
Notional amount, energy measure (in gigawatt-hours)
Derivative, Nonmonetary Notional Amount, Energy Measure
Notional amount, volume (in millions of decatherms)
Derivative, Nonmonetary Notional Amount, Volume
Schedule of Long-term Debt Instruments
Schedule of Long-term Debt Instruments [Table Text Block]
Schedule Of Line Of Credit Facilities
Schedule of Line of Credit Facilities [Table Text Block]
Debt Securities, Trading, and Equity Securities, FV-NI [Table]
Debt Securities, Trading, and Equity Securities, FV-NI [Table]
Debt and Equity Securities, FV-NI [Line Items]
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) [Abstract]
EquitySecuritiesFvNiAccumulatedUnrealizedGainLoss [Abstract]
Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) [Abstract]
Equity securities, FV-NI, unrealized gain
Equity Securities, FV-NI, Accumulated Unrealized Gain
Amount of accumulated unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Substantially all of the associated unrealized gains and losses on these investments are deferred as a regulatory asset or liability.
Equity securities, FV-NI, unrealized loss
Equity Securities, FV-NI, Accumulated Unrealized Loss
Amount of accumulated unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Substantially all of the associated unrealized gains and losses on these investments are deferred as a regulatory asset or liability.
Equity securities, FV-NI
Equity Securities, FV-NI
Equity Securities, FV-NI, Realized Gain (Loss) [Abstract]
Equity Securities, FV-NI, Realized Gain (Loss) [Abstract]
Equity securities, FV-NI, realized gain
Equity Securities, FV-NI, Realized Gain
Equity securities, FV-NI, realized loss
Equity Securities, FV-NI, Realized Loss
Contributions by Employer
Defined Benefit Plan, Plan Assets, Contributions by Employer
Asset Retirement Obligation [Abstract]
Asset Retirement Obligations
Asset Retirement Obligation Disclosure [Text Block]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Reserves for legal matters
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Table]
Income Tax Disclosure [Table]
Schedule reflecting income tax information.
Income Tax Disclosure [Line Items]
Income Tax Disclosure [Line Items]
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.
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Effective tax rate
Effective Income Tax Rate Reconciliation, Percent
Statement, Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Member's Equity [Member]
Members Equity [Member]
Members Equity
Common Stockholders' Equity [Member]
Parent [Member]
Common Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Net Gains (Losses) on Cash Flow Hedges [Member]
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Net Unrealized (Losses) Gains on Available for Sale Securities [Member]
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Pension and OPEB Adjustments [Member]
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Noncontrolling Interest [Member]
Noncontrolling Interest [Member]
Beginning Balance
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Beginning Balance, in shares
Beginning Balance (member's equity)
Members' Equity
Beginning Balance (parent)
Stockholders' Equity Attributable to Parent
Net Income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net income (attributable to parent)
Net Income (Loss) Attributable to Parent
Other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax
Common stock issuances, including dividend reinvestment and employee benefits, shares
Stock Issued During Period, Shares, New Issues
Common stock issuances, including dividend reinvestment and employee benefits
Stock Issued During Period, Value, New Issues
Common stock dividends
Dividends
Distributions to noncontrolling interest in subsidiaries
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Equitization of certain notes payable to affiliates
Equitization Of Notes Payable Due to Affiliates
The equitization of certain notes payable to affiliates.
Other
Stockholders' Equity, Other
Ending Balance
Ending Balance, in shares
Ending Balance (member's equity)
Ending Balance (parent)
Defined Contribution Plan [Table]
Defined Contribution Plan [Table]
Employee Savings Plan [Member]
Employee Savings Plan [Member]
Employee Savings Plan that provides participants with a defined contribution benefit.
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan Disclosure [Line Items]
Employer contributions
Defined Contribution Plan, Cost
Schedule of Variable Interest Entities [Table]
Schedule of Variable Interest Entities [Table]
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity, Not Primary Beneficiary [Member]
Cinergy Receivables [Member]
Cinergy Receivables [Member]
Cinergy Receivables
Variable Interest Entities [Line Items]
Variable Interest Entity [Line Items]
Anticipated credit loss ratio
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Expected Credit Losses
Discount rate
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate
Receivable turnover rate
Receivable Turnover Rate
The ratio of total receivables to total monthly billings, as related to total receivables.
Schedule Of Available For Sale Securities And Other Trading Assets [Table]
Schedule Of Available For Sale Securities And Other Trading Assets [Table]
Disclosure of information about investment in debt security measured at fair value with change in other comprehensive income and investment in equity security with change in fair value recognized in net income (FV-NI).
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items]
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items]
[Line Items] for Disclosure of information about investment in debt security measured at fair value with change in other comprehensive income and investment in equity security with change in fair value recognized in net income (FV-NI).
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized gain
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain
Amount of unrealized gain on investments in debt securities measured at fair value with change in fair value recognized in OCI and equity securities measured at fair value with change in fair value recognized in net income (FV-NI).
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized loss
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss
Amount of unrealized loss on investments in debt securities measured at fair value with change in fair value recognized in OCI and equity securities measured at fair value with change in fair value recognized in net income (FV-NI)
Cash and cash equivalents
Cash And Cash Equivalent Investments
Amount of cash and cash equivalents held in a trust fund or other type of investment.
Debt securities, available-for-sale, and equity securities, FV-NI
Debt Securities, Available-for-sale, and Equity Securities, FV-NI
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading
Common Stock
Stockholders' Equity Note Disclosure [Text Block]
Notional Amounts of Outstanding Derivative Positions
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Location And Fair Value Of Derivatives Recognized in the Condensed Consolidated Balance Sheets
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Offsetting Assets
Offsetting Assets [Table Text Block]
Offsetting Liabilities
Offsetting Liabilities [Table Text Block]
Derivative Contracts with Contingent Credit Features
Disclosure of Credit Derivatives [Table Text Block]
Debt And Credit Facilities
Debt Disclosure [Text Block]
Summary of Effective Tax Rates
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Receivables sold
Financing Receivable Sales
The amount of any sales of receivables during the reporting period.
Loss recognized on sale
Gain (Loss) on Sale of Accounts Receivable
Cash proceeds from receivables sold
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers
Collection fees received
Cash Flows Between Transferor and Transferee, Servicing Fees
Return received on retained interests
Proceeds from Collection of Retained Interest in Securitized Receivables
Derivatives and Hedging
Derivative Instruments and Hedging Activities Disclosure [Text Block]
ASSETS
Assets [Abstract]
Receivables (net of allowance for doubtful accounts)
Accounts and Other Receivables, Net, Current
Receivables of VIEs (net of allowance for doubtful accounts)
Accounts Receivable, Net, Current
Receivables from affiliated companies
Due from Related Parties, Current
Notes receivable from affiliated companies
Notes Receivable, Related Parties, Current
Regulatory assets (includes amounts related to VIEs)
Other
Total current assets
Assets, Current
Property, Plant and Equipment
Property, Plant and Equipment [Abstract]
Cost
Public Utilities, Property, Plant and Equipment, Plant in Service
Accumulated depreciation and amortization
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation
Generation facilities to be retired, net
Generation Facilities To Be Retired Net
Generation facilities to be retired, net
Net property, plant and equipment
Public Utilities, Property, Plant and Equipment, Net
Other Noncurrent Assets
Assets, Noncurrent [Abstract]
Goodwill
Goodwill
Regulatory assets
Nuclear decommissioning trust funds
Decommissioning Fund Investments
Investments in equity method unconsolidated affiliates
Equity Method Investments
Other
Other Assets, Noncurrent
Total other noncurrent assets
Investments and Other Noncurrent Assets
Total Assets
Assets
LIABILITIES AND EQUITY
Liabilities and Equity [Abstract]
Current Liabilities
Liabilities, Current [Abstract]
Accounts payable
Accounts Payable, Current
Accounts payable to affiliated companies
Due to Related Parties, Current
Notes payable and commercial paper
Short-term Debt
Notes payable to affiliated companies
Notes Payable, Related Parties, Current
Taxes accrued
Taxes Payable, Current
Interest accrued
Interest Payable, Current
Current maturities of long-term debt (includes amounts related to VIEs)
Asset retirement obligations
Regulatory liabilities
Regulatory Liability, Current
Other
Other Liabilities, Current
Total current liabilities
Liabilities, Current
Long-Term Debt (includes amounts related to VIEs)
Long-Term Debt Payable to Affiliated Companies
Notes Payable, Related Parties, Noncurrent
Other Noncurrent Liabilities
Other Liabilities, Noncurrent [Abstract]
Deferred income taxes
Deferred Income Taxes and Other Tax Liabilities, Noncurrent
Asset retirement obligations
Regulatory liabilities
Regulatory Liability, Noncurrent
Accrued pension and other post-retirement benefit costs
Liability, Defined Benefit Plan, Noncurrent
Investment tax credits
Accumulated Deferred Investment Tax Credit
Other
Deferred Credits and Other Liabilities
Total other noncurrent liabilities
Liabilities, Other than Long-term Debt, Noncurrent
Commitments and Contingencies
Commitments and Contingencies
Equity
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Member's equity
Members' Capital
Common stock
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital, Common Stock
Retained earnings
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total Duke Energy Corporation stockholders' equity
Noncontrolling interests
Stockholders' Equity Attributable to Noncontrolling Interest
Total member's equity
Total equity
Total Liabilities and Equity
Liabilities and Equity
Organization and Basis of Presentation
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]
Offsetting Liabilities [Table]
Offsetting Liabilities [Table]
Other Current Liabilities [Member]
Other Current Liabilities [Member]
Other Noncurrent Liabilities [Member]
Other Noncurrent Liabilities [Member]
Offsetting Liabilities [Line Items]
Offsetting Liabilities [Line Items]
Offsetting Derivative Liabilities [Abstract]
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized
Derivative Liability, Fair Value, Gross Liability
Gross amounts offset
Derivative Liability, Fair Value, Gross Asset
Net amounts recognized on the Condensed Consolidated Balance Sheet
Derivative Liability
Schedule of Asset Retirement Obligations
Schedule of Asset Retirement Obligations [Table Text Block]
Schedule of Change in Asset Retirement Obligation
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Document And Entity Information [Abstract]
Document and Entity Information [Abstract]
Document Information [Table]
Document Information [Table]
Document Information [Line Items]
Document Information [Line Items]
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Filer Category
Entity Filer Category
Document Type
Document Type
Document Period End Date
Document Period End Date
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Amendment Flag
Amendment Flag
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Trading Symbol
Trading Symbol
Entity Emerging Growth Company
Entity Emerging Growth Company
Entity Small Business
Entity Small Business
Reclassification of ATM credit carryforwards
Tax Cuts And Jobs Act Of 2017, Reclassification Of AMT Credit Carryforwards
Tax Cuts And Jobs Act Of 2017, Reclassification Of AMT Credit Carryforwards
Provisional adjustments for TCJA
TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit
Provisional Income Tax Expense (Benefit) associated with the Tax Cuts and Jobs Act of 2017.
Regulatory liability representing revaluation of deferred tax balances
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense
Revenue from Contract with Customer [Abstract]
Revenue
Revenue from Contract with Customer [Text Block]
Debt Securities, Available-for-sale [Table]
Debt Securities, Available-for-sale [Table]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract]
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax
Debt securities, available-for-sale
Debt Securities, Available-for-sale
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Debt securities, available-for-sale, realized gain
Debt Securities, Available-for-sale, Realized Gain
Debt securities, available-for-sale, realized loss
Debt Securities, Available-for-sale, Realized Loss
Fair Value Measurement Inputs and Valuation Techniques [Table]
Fair Value Measurement Inputs and Valuation Techniques [Table]
Asset Class [Axis]
Asset Class [Axis]
Asset Class [Domain]
Asset Class [Domain]
Financial Transmission Rights [Member]
Derivative Financial Instruments Liabilities Financial Transmission Rights [Member]
This item represents derivative instrument obligations related to financial transmission rights meeting the definition of a liability which are reported as of the balance sheet date.
Liability Class [Axis]
Liability Class [Axis]
Fair Value by Liability Class [Domain]
Fair Value by Liability Class [Domain]
Derivative Financial Instruments, Liabilities [Member]
Derivative Financial Instruments, Liabilities [Member]
Valuation Approach and Technique [Axis]
Valuation Approach and Technique [Axis]
Valuation Approach and Technique [Domain]
Valuation Approach and Technique [Domain]
Valuation, Market Approach [Member]
Valuation, Market Approach [Member]
Discounted Cash Flow [Member]
Valuation Technique, Discounted Cash Flow [Member]
Fair Value Measurement Inputs and Valuation Techniques
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net derivative asset (liability)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs
Input measurements (in usd per MWh and usd per MMBtu)
Derivative Asset (Liability) Net, Measurement Input
Statement of Cash Flows [Abstract]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities [Abstract]
Adjustments to reconcile net income to net cash provided by operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, amortization and accretion (including amortization of nuclear fuel)
Depreciation, Depletion and Amortization
Equity component of AFUDC
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity
Losses (gains) on sales of other assets
Gain (Loss) on Disposition of Other Assets
Impairment charges
Other Asset Impairment Charges
Deferred income taxes
Deferred Income Taxes and Tax Credits
Equity in earnings of unconsolidated affiliates
Income (Loss) from Equity Method Investments
Accrued pension and other post-retirement benefit costs
Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Contributions to qualified pension plans
Payment for Pension Benefits
Payments for asset retirement obligations
Asset Retirement Obligation, Cash Paid to Settle
Payment for disposal of other assets
Payment For Disposal Of Other Assets
The cash outflow associated with the payment for the disposal of other assets.
Other rate case adjustments
Other Operating Activities, Cash Flow Statement
Provision for rate refunds
Provision For Rate Refunds
Provision for rate refunds resulting from impacts of the federal statutory tax rate changing as a result of the Tax Cut and Jobs Act.
(Increase) decrease in
Increase (Decrease) in Operating Assets [Abstract]
Net realized and unrealized mark-to-market and hedging transactions
Unrealized Gain (Loss) on Derivatives
Receivables
Increase (Decrease) in Receivables
Receivable from affiliated companies
Increase (Decrease) in Accounts Receivable, Related Parties
Inventory
Increase (Decrease) in Inventories
Other current assets
Increase (Decrease) in Other Current Assets
Increase (decrease) in
Increase (Decrease) in Operating Liabilities [Abstract]
Accounts payable
Increase (Decrease) in Accounts Payable
Accounts payable to affiliated companies
Increase (Decrease) in Accounts Payable, Related Parties
Taxes accrued
Increase (Decrease) in Accrued Taxes Payable
Other current liabilities
Increase (Decrease) in Other Current Liabilities
Other assets
Increase (Decrease) in Other Operating Assets
Other liabilities
Increase (Decrease) in Other Operating Liabilities
Net cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities
CASH FLOWS FROM INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities [Abstract]
Capital expenditures
Payments to Acquire Property, Plant, and Equipment
Cost of removal, net of salvage
Payments for (Proceeds from) Removal Costs
Contributions to equity method investments
Payments to Acquire Interest in Subsidiaries and Affiliates
Purchases of debt and equity securities
Payments to Acquire Investments
Proceeds from sales and maturities of debt and equity securities
Proceeds from Sale, Maturity and Collection of Investments
Net proceeds from the sales of other assets
Proceeds from Sale of Productive Assets
Notes receivable from affiliated companies
Proceeds Or Payments From Collection Or Advance To Affiliate
The cash inflow (outflow) from the collection (advancement) of money to an affiliated entity.
Other
Payments for (Proceeds from) Other Investing Activities
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
CASH FLOWS FROM FINANCING ACTIVITIES
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from the issuance of long-term debt
Proceeds from Issuance of Long-term Debt
Proceeds from the issuance of common stock
Proceeds from Issuance or Sale of Equity
Payments for the redemption of long-term debt
Repayments of Long-term Debt
Proceeds from the issuance of short-term debt with original maturities greater than 90 days
Proceeds from Short-term Debt, Maturing in More than Three Months
Payments for the redemption of short-term debt with original maturities greater than 90 days
Repayments of Short-term Debt, Maturing in More than Three Months
Notes payable and commercial paper
Proceeds from (Repayments of) Short-term Debt
Notes payable to affiliated companies
Proceeds from (Repayments of) Related Party Debt
Capital contributions from parent
Proceeds from Contributions from Parent
Dividends to parent
Payments of Distributions to Affiliates
Distributions to parent
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid
Dividends paid
Payments of Ordinary Dividends, Common Stock
Other
Proceeds from (Payments for) Other Financing Activities
Net cash provided by financing activities
Net Cash Provided by (Used in) Financing Activities
Net decrease in cash, cash equivalents and restricted cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect
Net increase (decrease) in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash, cash equivalents and restricted cash at beginning of period
Cash, cash equivalents and restricted cash at end of period
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Significant non-cash transactions:
Noncash Investing and Financing Items [Abstract]
Accrued capital expenditures
Capital Expenditures Incurred but Not yet Paid
Non-cash dividends
Dividends, Common Stock, Stock
Non-cash equity contribution from parent or Transfer of ownership interest of certain equity method investees to parent
Other Significant Noncash Transaction, Value of Consideration Received
Equitization of certain notes payable to affiliates
Notes Reduction
Subsequent Events [Abstract]
Subsequent Events
Subsequent Events [Text Block]
Equity Method Investee [Member]
Equity Method Investee [Member]
Accounts payable, related parties
Accounts Payable, Related Parties, Current
Debt Securities, Trading, and Equity Securities, FV-NI
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block]
Debt Securities, Available-for-sale
Debt Securities, Available-for-sale [Table Text Block]
Available-for-sale Securities
Available-for-sale Securities [Table Text Block]
Investments Classified by Contractual Maturity Date
Investments Classified by Contractual Maturity Date [Table Text Block]
Schedule of Realized Gain (Loss)
Schedule of Realized Gain (Loss) [Table Text Block]
Pipeline Investments [Member]
Pipeline Investments [Member]
Pipeline Investments [Member]
Commercial Renewables [Member]
Commercial Renewables [Member]
Commercial Renewables
Other VIEs [Member]
Other Vies [Member]
Other VIEs
Other noncurrent assets
Total assets
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets
Taxes accrued
Current Liabilities: Other
Noncurrent Liabilities: Other
Total liabilities
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities
Net assets
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net
Regulatory Matters
Public Utilities Disclosure [Text Block]
Employee Benefit Plans
Pension and Other Postretirement Benefits Disclosure [Text Block]
Investments [Member]
Investments [Member]
Fair value measurement, transfers between activity levels
Fair Value Measurement Transfers Between Activity Levels
Transfers into and out of fair value hierarchy levels for assets or liabilities measured at fair value.
Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Total pretax realized or unrealized gains included in comprehensive income
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)
Purchases, sales, issuances and settlements:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]
Sales
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales
Balance at end of period
Derivatives (net)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period
Purchases, sales, issuances and settlements:
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract]
Purchases
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases
Settlements
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements
Total (losses) gains included on the Condensed Consolidated Balance Sheet
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Deferred Gains Or Losses As Regulatory Asset Or Liability
Total amount, including deferred gains or losses, recorded as regulatory assets and liabilities [net] measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.
Total gains (losses) and settlements
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease)
Balance at end of period
Investments and Derivatives, Net
Investments and Derivatives, Net [Abstract]
Investments and Derivatives, Net [Abstract]
Balance at beginning of period
Fair Value Measurement Unobservable Inputs Reconciliation Net
Fair value of financial instrument classified as asset (liability) after deduction of liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
Total pretax realized or unrealized gains included in comprehensive income
Fair Value Measurement Unobservable Inputs Reconciliation Net Gain Loss Included In Other Comprehensive Income Loss
Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset (liability) measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would be using.
Purchases, sales, issuances and settlements:
Fair Value, Instruments Measured On Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract]
Fair Value, Instruments Measured On Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract]
Purchases
Fair Value Net Financial Instrument Unobservable Inputs Reconciliation Purchases
Amount of purchases of financial instrument classified as an asset (liability) measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
Sales
Fair Value Net Financial Instrument Measure On Recurring Basis Unobservable Inputs Reconciliation Sales
Amount of sales of financial instrument classified as an asset (liability) after deduction of liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
Settlements
Fair Value Net Financial Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements
Amount of settlements of financial instrument classified as an asset (liability) after deduction of liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
Total (losses) gains included on the Condensed Consolidated Balance Sheet
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Deferred Gains Or Losses As Regulatory Assets And Liabilities Net
This element represents the total amount included on the consolidated balance sheet as regulatory assets and liabilities [net] measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.
Balance at end of period
Stock-Based Compensation
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Statement of Comprehensive Income [Abstract]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Other Comprehensive Income, net of tax
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Pension and OPEB adjustments
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Net unrealized (losses) gains on cash flow hedges
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax
Reclassification into earnings from cash flow hedges
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax
Unrealized (losses) gains on available-for-sale securities
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax
Other Comprehensive Income, net of tax
Comprehensive Income
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Less: Comprehensive (Loss) Income Attributable to Noncontrolling Interests
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
Comprehensive Income Attributable to Duke Energy Corporation
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Forward Contract Indexed to Issuer's Equity [Table]
Forward Contract Indexed to Issuer's Equity [Table]
Forward Contract Indexed to Issuer's Equity, Type [Axis]
Forward Contract Indexed to Issuer's Equity, Type [Axis]
Forward Contract Indexed to Issuer's Equity, Type [Domain]
Forward Contract Indexed to Issuer's Equity, Type [Domain]
ATM [Member]
ATM [Member]
ATM [Member]
Equity Forwards [Member]
Equity Forwards [Member]
Equity Forwards [Member]
Wells Fargo Bank [Member]
Wells Fargo Bank [Member]
Wells Fargo Bank [Member]
Citibank [Member]
Citibank [Member]
Citibank [Member]
Forward Contract Indexed to Issuer's Equity [Line Items]
Forward Contract Indexed to Issuer's Equity [Line Items]
Maximum value of shares to be issued under ATM program
Maximum Value Of Shares To Be Issued Under ATM Program
Maximum value of shares to be issued under ATM program of its common stock through an at-the-market offering program, including an equity forward sales component.
Shares offered
Forward Contract Indexed to Issuer's Equity, Indexed Shares
Forward contract indexed to issuer's equity, forward rate per share
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share
Sales price
Sales price
Price per share in connection with the forward sale agreements under which the company agreed to issue and sell to the counterparties
Settlement alternative, shares
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value
Shares, Issued
Shares, Issued
Forward contract indexed to issuer's equity, shares
Forward Contract Indexed to Issuer's Equity, Shares
Stock issued during period, shares, DRIP
Stock Issued During Period, Shares, Dividend Reinvestment Plan
Stock issued during period, value, DRIP
Stock Issued During Period, Value, Dividend Reinvestment Plan
Receivables sold
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding
Less: Retained interests
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding
Net receivables sold
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding
New Accounting Pronouncements or Change in Accounting Principle [Table]
New Accounting Pronouncements or Change in Accounting Principle [Table]
Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement Location [Domain]
Income Statement Location [Domain]
Operating income and expenses, net [Member]
Operating Expense [Member]
Nonoperating income and expenses, net [Member]
Nonoperating Income (Expense) [Member]
Adjustments for New Accounting Pronouncements [Axis]
Adjustments for New Accounting Pronouncements [Axis]
Type of Adoption [Domain]
Type of Adoption [Domain]
Accounting Standards Update 2017-07 [Member]
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement, quantified affect
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification
Schedule of Related Party Transactions, Other Revenue and Expense
Schedule of Related Party Transactions [Table Text Block]
Schedule Of Stock-Based Compensation Expense
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
Disaggregation of Revenue
Disaggregation of Revenue [Table Text Block]
Schedule Of Unbilled Revenues With Restricted Receivables
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Valuation and Qualifying Accounts Disclosure [Table]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table]
Valuation Allowances and Reserves Type [Axis]
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
Valuation Allowances and Reserves [Domain]
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
Reserve, Environmental Cost [Member]
SEC Schedule, 12-09, Reserve, Environmental Cost [Member]
Reserve, Legal [Member]
SEC Schedule, 12-09, Reserve, Legal [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Schedule of Additional Possible Losses in Excess of Recorded Environmental Reserves
Environmental Exit Costs by Cost [Table Text Block]
Schedule of Legal Reserves
Schedule of Loss Contingencies by Contingency [Table Text Block]
Business Segments
Segment Reporting Disclosure [Text Block]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount
Revenue, Remaining Performance Obligation, Amount
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Designated As Hedging Instrument [Member]
Commodity Contracts [Member]
Commodity Contract [Member]
Noncurrent Assets, Other [Member]
Other Noncurrent Assets [Member]
Current Liabilities, Other [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)
Derivative Asset, Fair Value, Gross Asset
Location and fair value amounts of derivatives (Liability)
Income Statement [Abstract]
Product and Service [Axis]
Product and Service [Axis]
Product and Service [Domain]
Product and Service [Domain]
Electricity, US Regulated [Member]
Electricity, US Regulated [Member]
Electricity, Nonregulated [Member]
Electricity, Nonregulated [Member]
Electricity, Nonregulated [Member]
Electricity [Member]
Electricity [Member]
Natural Gas [Member]
Natural Gas [Member]
Operating Revenues
Revenues [Abstract]
Regulated electric
Regulated Operating Revenue, Electric, Non-Nuclear
Regulated natural gas
Regulated Operating Revenue, Gas
Nonregulated electric and other
Unregulated Operating Revenue
Total operating revenues
Regulated and Unregulated Operating Revenue
Operating Expenses
Costs and Expenses [Abstract]
Fuel used in electric generation and purchased power/Cost of natural gas
Cost of Goods and Services Sold
Depreciation and amortization
Cost, Depreciation, Amortization and Depletion
Property and other taxes
Taxes, Miscellaneous
Impairment charges
Asset Impairment Charges
Total operating expenses
Costs and Expenses
Gains (Losses) on Sales of Other Assets and Other, net
Operating Income
Operating Income (Loss)
Other Income and Expenses
Nonoperating Income (Expense) [Abstract]
Equity in earnings of unconsolidated affiliates
Other income and expenses, net
Other Nonoperating Income (Expense)
Total other income and expenses
Nonoperating Income (Expense)
Interest Expense
Interest Expense
Income Tax Expense From Continuing Operations
Income Tax Expense (Benefit)
Income From Continuing Operations
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
Income (Loss) From Discontinued Operations, net of tax
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
Net Income
Less: Net (Loss) Income Attributable to Noncontrolling Interests
Net Income (Loss) Attributable to Noncontrolling Interest
Net Income Attributable to Duke Energy Corporation
Other Comprehensive Income (Loss), net of tax
Net unrealized (losses) gains on cash flow hedges
Unrealized (losses) gains on available-for-sale securities
Less: Comprehensive (Loss) Income Attributable to Noncontrolling Interests
Earnings Per Share – Basic and Diluted
Earnings Per Share, Basic and Diluted [Abstract]
Income from continuing operations attributable to Duke Energy Corporation common stockholders
Income From Continuing Operations Attributable To Parent Common Shareholders [Abstract]
Income from continuing operations attributable to Parent's common shareholders
Basic (usd per share)
Income (Loss) from Continuing Operations, Per Basic Share
Diluted (usd per share)
Income (Loss) from Continuing Operations, Per Diluted Share
Loss from discontinued operations attributable to Duke Energy Corporation common stockholders
Income Loss From Discontinued Operations Attributable To Parent Common Shareholders [Abstract]
Income Loss From Discontinued Operations Attributable To Parent Common Shareholders [Abstract]
Basic (usd per share)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share
Diluted (usd per share)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share
Net income attributable to Duke Energy Corporation common stockholders
Earnings Per Share [Abstract]
Basic (usd per share)
Earnings Per Share, Basic
Diluted (usd per share)
Earnings Per Share, Diluted
Weighted average shares outstanding
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic (shares)
Weighted Average Number of Shares Outstanding, Basic
Diluted (shares)
Weighted Average Number of Shares Outstanding, Diluted
Excise taxes collected
Excise Taxes Collected
Commitments And Contingencies
Commitments and Contingencies Disclosure [Text Block]
DEFPF [Member]
DEFPF [Member]
Duke Energy Florida Project Finance LLC [Member]
DERF [Member]
DERF [Member]
Wholly owned limited liability company named Duke Energy Receivables Finance Company, LLC.
DEPR [Member]
DEPR [Member]
Duke Energy Progress Receivables, LLC
DEFR [Member]
Defr [Member]
Duke Energy Flordia Receivables, LLC
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Receivables of VIEs
Accounts Receivable from Securitization
Property, plant and equipment, cost
Related Party Transaction [Axis]
Related Party Transaction [Axis]
Related Party Transaction [Domain]
Related Party Transaction [Domain]
Corporate governance and shared service expenses [Member]
Corporate Governance And Shared Service Expenses [Member]
Proportionate share of corporate governance and other costs, primarily related to human resources, employee benefits, legal and accounting fees, as well as other third party costs.
Indemnification coverages [Member]
Indemnification Coverages [Member]
Certain indemnification coverages incurred through captive insurance subsidiary
JDA [Member]
Joint Dispatch Agreement [Member]
Revenues or expenses from the joint dispatch agreement between Duke Energy Carolinas and Progress Energy Carolinas
Intercompany natural gas transactions [Member]
Intercompany Natural Gas Transactions [Member]
Intercompany Natural Gas Transactions between Piedmont Natural Gas and Duke Energy Carolinas/Duke Energy Progress
Related party transaction, other revenues from transactions with related party
Related Party Transaction, Other Revenues from Transactions with Related Party
Related party transaction, expenses from transactions with related party
Related Party Transaction, Expenses from Transactions with Related Party
First Mortgage [Member]
March 2018 Debt Issuance 3.950% Coupon Due 2025 [Member]
March 2018 Debt Issuance 3.950% Coupon Due 2025 [Member]
March 2018 Debt Issuance 3.950% Coupon Due 2025 [Member]
May 2018 Debt Issuance 2.819% Coupon Due 2021 [Member] [Member]
May 2018 Debt Issuance 2.819% Coupon Due 2021 [Member]
May 2018 Debt Issuance 2.819% Coupon Due 2021
September 2018 Debt Issuance 5.625% Coupon Due 2078 [Member]
September 2018 Debt Issuance 5.625% Coupon Due 2078 [Member]
September 2018 Debt Issuance 5.625% Coupon Due 2078 [Member]
March 2018 Debt Issuance 3.050% Coupon Due 2023 [Member]
March 2018 Debt Issuance 3.050% Coupon Due 2023 [Member]
March 2018 Debt Issuance 3.050% Coupon Due 2023 [Member]
March 2018 Debt Issuance 3.950% Coupon Due 2048 [Member]
March 2018 Debt Issuance 3.950% Coupon Due 2048 [Member]
March 2018 Debt Issuance 3.950% Coupon Due 2048 [Member]
June 2018 Debt issuance 3.80% coupon Due 2028 [Member]
June 2018 Debt issuance 3.80% coupon Due 2028 [Member]
June 2018 Debt issuance 3.80% coupon Due 2028 [Member]
June 2018 Debt Issuance 4.20 Coupon Due 2048 [Member]
June 2018 Debt Issuance 4.20 Coupon Due 2048 [Member]
June 2018 Debt Issuance 4.20% Coupon Due 2048 [Member]
First Mortgage Bonds Maturing April 2018, 5.100% Coupon
First Mortgage Bonds Maturing April 2018, 5.100% Coupon [Member]
First Mortgage Bonds Maturing April 2018, 5.100% Coupon [Member]
August 2018 Debt Issuance 3.375% Coupon Due 2023 [Member]
August 2018 Debt Issuance 3.375% Coupon Due 2023 [Member]
August 2018 Debt Issuance 3.375% Coupon Due 2023 [Member]
August 2018 Debt Issuance 3.700% Coupon Due 2028 [Member]
August 2018 Debt Issuance 3.700% Coupon Due 2028 [Member]
August 2018 Debt Issuance 3.700% Coupon Due 2028 [Member]
Debt issuances
Debt Instrument, Face Amount
Repayments of long-term debt
Due in one year or less
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value
Due after one through five years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value
Due after five through 10 years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value
Due after 10 years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value
Total
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table]
Schedule of Goodwill [Table]
Segments [Axis]
Segments [Axis]
Segments [Domain]
Segments [Domain]
Electric Utilities and Infrastructure [Member]
Electric Utilities and Infrastructure [Member]
Electric Utilities and Infrastructure Segment
Gas Utilities and Infrastructure [Member]
Gas Utilities and Infrastructure [Member]
Gas Utilities and Infrastructure [Member]
Goodwill [Line Items]
Goodwill [Line Items]
Goodwill balance
Goodwill, Gross
Accumulated impairment charges
Goodwill, Impaired, Accumulated Impairment Loss
Goodwill balance, adjusted for accumulated impairment charges
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period
Accretion expense
Asset Retirement Obligation, Accretion Expense
Liabilities settled
Asset Retirement Obligation, Liabilities Settled
Liabilities incurred in the current year
Asset Retirement Obligation, Liabilities Incurred
Revision in estimates of cash flows
Asset Retirement Obligation, Revision of Estimate
Balance at end of period
Goodwill
Goodwill and Intangible Assets Disclosure [Text Block]
Income Taxes
Income Tax Disclosure [Text Block]
Schedule of Defined Benefit Plans Disclosures
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Components of Net Periodic Pension Costs
Schedule of Net Benefit Costs [Table Text Block]
Defined Contribution Plan Disclosures
Defined Contribution Plan Disclosures [Table Text Block]
Cardinal Pipeline Company, LLC [Member]
Cardinal Pipeline Company, LLC [Member]
Cardinal Pipeline Company, LLC [Member]
Pine Needle LNG Company, LLC [Member]
Pine Needle LNG Company, LLC [Member]
Pine Needle LNG Company, LLC [Member]
Hardy Storage Company, LLC [Member]
Hardy Storage Company, LLC [Member]
Hardy Storage Company, LLC [Member]
Income from continuing operations attributable to Duke Energy common stockholders excluding impact of participating securities
Income (Loss) from Continuing Operations, Net of Tax, Excluding Participating Securities
Amount after tax of income (loss) from continuing operations attributable to parent, excluding the impact of participating securities.
Average shares, basic
Equity Forwards, shares
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements
Average shares, diluted
EPS, basic (usd per share)
EPS, diluted (usd per share)
Number of stock options and performance and unvested stock awards excluded from the dilutive securities calculation
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Dividends declared per share (usd per share)
Common Stock, Dividends, Per Share, Declared
Pioneer Transmission [Member]
Pioneer Transmission [Member]
Pioneer Transmission, LLC
OVEC [Member]
OVEC [Member]
OVEC [Member]
Variable interest entity, financial or other support, amount
Variable Interest Entity, Financial or Other Support, Amount
Percent of proceeds received as cash
Percent of proceeds received as cash
Percent of proceeds from accounts receivable securitization received as cash.
Percent of proceeds received as subordinated note
Percent of proceeds received as subordinated note
Percent of proceeds from accounts receivable securitization received as subordinated note.
Minimum equity balance required by Cinergy Receivables
Receivables To Maintain Minimum equity Balance
Minimum equity Balance required by Cinergy Receivables
Variable interest entity ownership interest
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage
Fixed interest rate added to LIBOR to compute variable rate
Debt Instrument, Basis Spread on Variable Rate
Subsequent Event [Table]
Subsequent Event [Table]
Public Utilities, Regulatory Proceeding [Axis]
Public Utilities, Regulatory Proceeding [Axis]
Public Utilities, Regulatory Proceeding [Domain]
Public Utilities, Regulatory Proceeding [Domain]
Hurricane Michael Storm Damage [Member]
Hurricane Michael Storm Damage [Member]
Hurricane Michael Storm Damage [Member]
Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
Estimated Impact [Member]
Scenario, Forecast [Member]
Subsequent Event [Line Items]
Subsequent Event [Line Items]
Estimated capital cost
Estimated capital cost
Estimated capital cost of new project
Consolidation Items [Axis]
Consolidation Items [Axis]
Consolidation Items [Domain]
Consolidation Items [Domain]
Operating Segments [Member]
Operating Segments [Member]
Intersegment Eliminations [Member]
Intersegment Eliminations [Member]
Corporate, Non-Segment [Member]
Corporate, Non-Segment [Member]
Total Reportable Segments [Member]
Total Reportable Segments [Member]
Total Reportable Segments
Other [Member]
Other Segments [Member]
Operating revenues
Segment income (loss)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent
Add back noncontrolling interests
Segment assets
Disaggregation of Revenue [Table]
Disaggregation of Revenue [Table]
Natural Gas, US Regulated [Member]
Natural Gas, US Regulated [Member]
Other Revenues [Member]
Other Revenues [Member]
Other Revenues
Customer [Axis]
Customer [Axis]
Customer [Domain]
Customer [Domain]
Residential [Member]
Residential [Member]
Residential Customer Class [Member]
General [Member]
General [Member]
General service customers
Commercial [Member]
Commercial [Member]
Commercial Customer [Member]
Industrial [Member]
Industrial [Member]
Industrial Customer [Member]
Wholesale [Member]
Wholesale [Member]
Wholesale Customer [Member]
Power Generation [Member]
Power Generation [Member]
Power Generation [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers
Revenue from Contract with Customer, Including Assessed Tax
Revenue from sources other than contracts with customers
Revenue from sources other than contracts with customers
Revenue from sources other than contracts with customers
Revenue, Initial Application Period Cumulative Effect Transition [Table]
Revenue, Initial Application Period Cumulative Effect Transition [Table]
Initial Application Period Cumulative Effect Transition [Axis]
Initial Application Period Cumulative Effect Transition [Axis]
Initial Application Period Cumulative Effect Transition [Domain]
Initial Application Period Cumulative Effect Transition [Domain]
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Accounting Standards Update 2014-09 [Member]
Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Debt Instrument, Name [Domain]
Litigation Case [Domain]
USDOJ [Member]
USDOJ [Member]
United States Department of Justice [Member]
North Carolina Ash Basins [Member]
North Carolina Ash Basins [Member]
North Carolina Ash Basins
Three Year Revolving Credit Facility [Member]
June 2017 Three Year Revolving Credit Facility [Member]
June 2017 Three Year Revolving Credit Facility [Member]
Minimum master credit facility balance required
Minimum Master Credit Facility Balance Required
Minimum Master Credit Facility Balance Required to be maintained to meet obligations outlined in Plea Agreements
Outstanding balance
Long-term Line of Credit
Line of credit facility, expiration date
Line of Credit Facility, Expiration Date
Offsetting Assets [Table]
Offsetting Assets [Table]
Offsetting Assets [Line Items]
Offsetting Assets [Line Items]
Offsetting Derivative Assets [Abstract]
Offsetting Derivative Assets [Abstract]
Gross amounts recognized
Gross amounts offset
Derivative Asset, Fair Value, Gross Liability
Net amounts recognized on the Condensed Consolidated Balance Sheet
Derivative Asset
Public Utilities General Disclosures [Table]
Public Utilities General Disclosures [Table]
Allen Steam Station Units 1-3 [Member]
Allen Steam Station Units 1-3 [Member]
Allen Steam Station Units 1-3 [Member]
Crystal River Units 1 and 2 [Member]
Crystal River Units 1 and 2 [Member]
Crystal River Units 1 and 2 [Member]
Gallagher Units 2 and 4 [Member]
Gallagher Units 2 and 4 [Member]
Gallagher Units 2 and 4 [Member]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment, Type [Domain]
Generation Facilities To Be Retired [Member]
Generation Facilities To Be Retired [Member]
Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, General Disclosures [Line Items]
Capacity (in MW)
Coal-Fired Generation Capacity Potential Plants To Be Retired, in Megawatts
Coal-Fired Generation Capacity, in Megawatts
Public utilities, property, plant and equipment, net
Accumulated impairment charges
Goodwill impairment
Goodwill, Impairment Loss
Cinergy Receivables [Member]
Accounts receivable from securitization
Atlantic Coast Pipeline [Member]
Atlantic Coast Pipeline [Member]
Atlantic Coast Pipeline [Member]
Sabal Trail Transmission Pipeline [Member]
Sabal Trail Transmission Pipeline [Member]
Sabal Trail Transmission Pipeline [Member]
Constitution Pipeline [Member]
Constitution Pipeline [Member]
Constitution Pipeline [Member]
Equity method investment, OTTI
Equity Method Investment, Other than Temporary Impairment
Equity method investment, line of credit facility, maximum borrowing capacity
Equity Method Investment Line Of Credit Facility Maximum Borrowing Capacity
Maximum borrowing capacity, for the equity method investment that is not consolidated, under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.
Variable interest entity, entity maximum loss exposure, percent
Variable Interest Entity Entity Maximum Loss Exposure Percent
The reporting entity's maximum percentage of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).
Variable interest entity, nonconsolidated, carrying amount, liabilities
Investments in joint ventures
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables
Unbilled Receivables, Current
Schedule Of Variable Interest Entities
Schedule of Variable Interest Entities [Table Text Block]
Debt Securities [Member]
Debt Securities [Member]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Level 3 [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value Measured at Net Asset Value Per Share [Member]
Fair Value Measured at Net Asset Value Per Share [Member]
Investments, fair value disclosures
Investments, Fair Value Disclosure
Derivative assets
Total assets
Assets, Fair Value Disclosure
Derivative liabilities
Net assets (liabilities)
Fair Value, Net Asset (Liability)
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent Event [Member]
Subsequent Event [Member]
Regulatory Liability [Axis]
Regulatory Liability [Axis]
Regulatory Liability [Domain]
Regulatory Liability [Domain]
Storm Costs [Member]
Storm Costs [Member]
Hurricane Florence Storm Damage [Member]
Hurricane Florence Storm Damage [Member]
Hurricane Florence Storm Damage [Member]
2017 North Carolina Rate Case [Member]
2017 NC Rate Case [Member]
2017 NC Rate Case [Member]
FERC Formula Rate Matter [Member]
FERC Formula Rate Matter [Member]
FERC Formula Rate Matter [Member]
2016 South Carolina Rate Case Settlement [Member]
2016 South Carolina Rate Case Settlement [Member]
2016 South Carolina Rate Case Settlement [Member]
2016 South Carolina Rate Case Settlement Year 1 Increase [Member]
2016 South Carolina Rate Case Settlement Year 1 Increase [Member]
2016 South Carolina Rate Case Settlement Year 1 Increase [Member]
2016 South Carolina Rate Case Settlement Year 2 Increase [Member]
2016 South Carolina Rate Case Settlement Year 2 Increase [Member]
2016 South Carolina Rate Case Settlement Year 2 Increase [Member]
2018 Sale of Hydro Plants [Member]
2018 Sale of Hydro Plants [Member]
2018 Sale of Hydro Plants [Member]
Western Carolinas Modernization Plan [Member]
Western Carolinas Modernization Plan [Member]
Western Carolinas Modernization Plan [Member]
Shearon Harris Nuclear Expansion [Member]
Shearon Harris Nuclear Expansion [Member]
Shearon Harris Nuclear Expansion [Member]
2018 PSCSC Petitions [Member]
2018 PSCSC Petitions [Member]
2018 PSCSC Petitions [Member]
FERC Form 1 Reporting Matter [Member]
FERC Form 1 Reporting Matter [Member]
FERC Form 1 Reporting Matter [Member]
Storm Restoration Cost Recovery [Member]
Storm Restoration Cost Recovery [Member]
Storm Restoration Cost Recovery [Member]
Federal Tax Act Impacts [Member]
Federal Tax Act Impacts [Member]
Federal Tax Act Impacts [Member]
Federal Tax Act Impacts Revenue Requirement [Member]
Federal Tax Act Impacts Revenue Requirement [Member]
Federal Tax Act Impacts Revenue Requirement [Member]
Citrus County Combined Cycle Facility [Member]
Citrus County Combined Cycle Facility [Member]
Citrus County Combined Cycle Facility [Member]
2017 Second Revised and Restated Stipulation and Settlement Agreement [Member]
Second Revised And Restated Stipulation And Settlement Agreement 2017 [Member]
Second Revised And Restated Stipulation And Settlement Agreement 2017 [Member]
2017 Ohio Electric Base Rate Case [Member]
2017 Ohio Base Rate Case [Member]
2017 Ohio Base Rate Case [Member]
Energy Efficiency Cost Recovery [Member]
Energy Efficiency Cost Recovery Program [Member]
Energy Efficiency Cost Recovery Program [Member]
Natural Gas Pipeline Extension [Member]
Natural Gas Pipeline Extension [Member]
Natural Gas Pipeline Extension [Member]
Duke Energy Kentucky Electric Rate Case [Member]
Duke Energy Kentucky Electric Rate Case [Member]
Duke Energy Kentucky Electric Rate Case [Member]
Duke Energy Kentucky Gas Base Rate Case [Member]
Duke Energy Kentucky Gas Base Rate Case [Member]
Duke Energy Kentucky Gas Base Rate Case [Member]
FERC 494 Refund of Regional Transmission Enhancement Projects [Member]
FERC 494 Refund Of Regional Transmission Enhancement Projects [Member]
FERC 494 Refund Of Regional Transmission Enhancement Projects [Member]
FERC Transmission Rates [Member]
FERC Transmission Rates [Member]
FERC Transmission Rates [Member]
FERC Complaint [Member]
FERC Complaint [Member]
FERC Complaint regarding return on equity percentage
FERC Complaint 1 [Member]
FERC Complaint 1 [Member]
FERC Complaint 1 [Member]
FERC Complaint 2 [Member]
FERC Complaint 2 [Member]
FERC Complaint 2 [Member]
Federal Tax Act Impacts Tranche 1 [Member]
Federal Tax Act Impacts Tranche 1 [Member]
Federal Tax Act Impacts Tranche 1 [Member]
Federal Tax Act Impacts Tranche 2 [Member]
Federal Tax Act Impacts Tranche 2 [Member]
Federal Tax Act Impacts Tranche 2 [Member]
South Carolina Rate Stabilization Adjustment Filing [Member]
South Carolina Rate Stabilization Adjustment Filing [Member]
South Carolina Rate Stabilization Adjustment Filing [Member]
NCUC IMR Petition filed October 2018 [Member]
NCUC IMR Petition Filed October 2018 [Member]
NCUC IMR Petition Filed October 2018 [Member]
Progress Energy Merger FERC Mitigation [Member]
Progress Energy Merger FERC Mitigation [Member]
Progress Energy Merger FERC Mitigation [Member]
NCUC IMR Petition filed May 2018 [Member]
NCUC IMR Petition filed May 2018 [Member]
NCUC IMR Petition filed May 2018 [Member]
William States Lee Combined Cycle Facility [Member]
William States Lee Combined Cycle Facility [Member]
William States Lee Combined Cycle Facility [Member]
Asheville Plant [Member]
Asheville Plant [Member]
Asheville Plant [Member]
Crystal River Units 3 and 4 [Member]
Crystal River Units 3 and 4 [Member]
Crystal River Units 3 and 4 [Member]
Citrus County Station [Member]
Citrus County Station [Member]
Citrus County Station [Member]
Hamilton Project [Member]
Hamilton Project [Member]
Hamilton Project [Member]
Columbia Project [Member]
Columbia Project [Member]
Columbia Project [Member]
William State Lee Iii Nuclear Station [Member]
William State Lee Iii Nuclear Station [Member]
William State Lee III Nuclear Station
Edwardsport Integrated Gasification Combined Cycle Plant [Member]
Edwardsport Integrated Gasification Combined Cycle Plant [Member]
Edwardsport Integrated Gasification Combined Cycle Plant [Member]
Benton County Wind Farm Dispute [Member]
Benton County Wind Farm Dispute [Member]
Benton County Wind Farm Dispute [Member]
Regulatory Agency [Axis]
Regulatory Agency [Axis]
Regulatory Agency [Domain]
Regulatory Agency [Domain]
NCUC [Member]
NCUC [Member]
NCUC [Member]
FERC [Member]
Federal Energy Regulatory Commission [Member]
Federal Energy Regulatory Commission [Member]
PSCSC [Member]
PSCSC [Member]
Public Service Commission of South Carolina [Member]
FPSC [Member]
FPSC [Member]
Florida Public Service Commission [Member]
PUCO [Member]
Public Utilities Commission Of Ohio [Member]
Public Utilities Commission of Ohio regulatory body.
OPSB [Member]
Ohio Power Siting Board [Member]
Ohio Power Siting Board [Member]
KPSC [Member]
KPSC [Member]
KPSC [Member]
IURC [Member]
IURC [Member]
IURC [Member] Indiana Utility Regulatory Commission
Regulatory Asset [Axis]
Regulatory Asset [Axis]
Regulatory Asset [Domain]
Regulatory Asset [Domain]
Asset retirement obligations - coal ash [Member]
Asset retirement obligations - coal ash [Member]
Asset retirement obligations - coal ash [Member]
Deferred Project Costs [Member]
Deferred Project Costs [Member]
Dominion Resources [Member]
Dominion Resources [Member]
Dominion Resources [Member]
Southern Company Gas [Member]
Southern Company Gas [Member]
Southern Company Gas
Spectra Energy Partners [Member]
EnbridgeInc [Member]
Enbridge Inc (formerly Spectra Energy) [Member]
NextEra Energy [Member]
NextEra Energy [Member]
NextEra Energy [Member]
Williams Partners L.P. [Member]
Williams Partners L.P. [Member]
Williams Partners L.P. [Member]
Jointly Owned Utility Plant [Axis]
Jointly Owned Utility Plant [Axis]
Jointly Owned Utility Plant [Domain]
Jointly Owned Utility Plant [Domain]
NCEMC [Member]
NCEMC [Member]
North Carolina Electric Membership Corporation [Member]
Atlantic Coast Pipeline (ACP) [Member]
Atlantic Coast Pipeline (ACP) [Member]
Atlantic Coast Pipeline (ACP) [Member]
Customers experiencing outages
Customers Experiencing Outages
Customers Experiencing Outages
Requested rate increase (decrease), amount
Public Utilities, Requested Rate Increase (Decrease), Amount
Requested rate increase, percentage
Public Utilities, Requested Rate Increase (Decrease), Percentage
Requested return on equity, percent
Public Utilities, Requested Return on Equity, Percentage
Public utilities, requested equity capital structure, percentage
Public Utilities, Requested Equity Capital Structure, Percentage
Public utilities, requested debt capital structure, percentage
Public Utilities, Requested Debt Capital Structure, Percentage
Regulatory assets
Regulatory Assets
Regulatory asset, amortization period
Regulatory Asset, Amortization Period
Penalty assessed
Penalty assessed
Penalty assessed
Estimated future coal ash costs
Estimated future coal ash costs
Estimated future coal ash costs
Utilities operating expenses, impairments
Utilities Operating Expense
Customer refundable fees, refund payments
Customer Refundable Fees, Refund Payments
Estimated capital cost of new utility plant, including AFUDC
Estimated Capital Cost Including Afudc
Estimated capital cost of new utility plant including AFUDC.
Approved rate increase (decrease), amount
Public Utilities, Approved Rate Increase (Decrease), Amount
Impairment and related charges
Joint owner ownership percentage
Jointly Owned Utility Plant, Proportionate Ownership Share
Estimated loss on asset sale
Estimated loss on Asset Sale
Estimated loss on Asset Sale
Requested rate increase (decrease), amended amount
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount
Requested rate increase (decrease) amended, percentage
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage
Estimated storm costs - capital and operation maintenance
Estimated Storm Costs - Capital and Operation Maintenance
Estimated Storm Costs - Capital and Operation Maintenance
Excluded deferred coal ash costs
Excluded Deferred Coal Ash Costs
Amount of excluded deferred coal ash costs.
Approved return on equity percentage
Public Utilities, Approved Return on Equity, Percentage
Wholesale debt return amortization period
Wholesale Debt Return Amortization Period
Wholesale Debt Return Amortization Period
Allowed storm allowance
Regulatory Liabilities
Tax act annual savings
Tax Act Annual Tax Savings Requested Rate Decrease, Amount
Tax Act Annual Tax Savings requested rate decrease as a result of the 2017 Federal Tax Cut and Jobs Act
Tax act excess deferred tax amortization requested rate decrease, amount
Tax Act Excess Deferred Tax Amortization Requested Rate Decrease, Amount
Tax Act Excess Deferred Tax Amortization requested rate decrease as a result of the 2017 Federal Tax Cut and Jobs Act
Requested rider revenue increase
Requested Rider Revenue Increase
Requested Rider Revenue Increase
Regulated operating revenue, electric, non-nuclear
Approved rate increase (decrease), one-time waiver amount
Approved Rate Increase (Decrease), One Time Waiver, Amount
Approved Rate Increase (Decrease) One Time Waiver, Amount
Estimated capital cost excluding AFUDC
Estimated Capital Cost Excluding AFUDC
Estimated Capital Cost Excluding AFUDC
Public utilities, approved equity capital structure, percentage
Public Utilities, Approved Equity Capital Structure, Percentage
Total allocable capitalization
Total Allocable Capitalization
Kentucky Capital Structure consists of LTD + STD + Preferred Stock + Common Equity = Total Allocable Capitalization
Incremental rider revenue
Incremental Rider Revenue
Incremental Rider Revenue
Approved return on equity percentage adder
Approved Return on Equity Percentage Adder
Approved Return on Equity Percentage Adder
Litigation settlement, amount awarded to other party
Litigation Settlement, Amount Awarded to Other Party
Decrease in regulatory assets
Increase (Decrease) in Other Regulatory Assets
Long-term purchase commitment, period
Long-term Purchase Commitment, Period
Estimated contributions
Estimated Contributions
The estimated cash outflow associated with contributions to an equity method investment (EMI) to fund the EMI's development and construction of a new natural gas pipeline.
Goodwill By Reportable Operating Segment
Schedule of Goodwill [Table Text Block]