Compensation and Retirement Disclosure [Abstract]
Schedule of Defined Benefit Plans Disclosures [Table]
Schedule of Defined Benefit Plans Disclosures [Table]
Defined Benefit Plan Legacy [Axis]
Defined Benefit Plan Legacy [Axis]
Defined benefit plan legacy axis
Defined Benefit Plan Legacy [Domain]
Defined Benefit Plan Legacy [Domain]
CENG [Member]
CENG [Member]
Represents a joint venture relating to a nuclear generation and operation business.
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
Exelon Generation Co L L C [Member]
Exelon Generation Co L L C [Member]
Exelon Generation Co LLC [Member]
Commonwealth Edison Co [Member]
Commonwealth Edison Co [Member]
Commonwealth Edison Co [Member]
PECO Energy Co [Member]
PECO Energy Co [Member]
PECO Energy Co [Member]
Baltimore Gas and Electric Company [Member]
Baltimore Gas and Electric Company [Member]
Business Services Company [Member]
Business Services Company [Member]
Business Services Company.
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Matching Contributions
Defined Benefit Plan, Contributions by Employer
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Segment Consolidating Item [Axis]
Segment Consolidating Item [Axis]
Consolidating Items Incuding Reportable Segments and Intersegment Eliminations
Segment Consolidating Items [Domain]
Segment Consolidating Items [Domain]
Consolidating Items Incuding Reportable Segments and Intersegment Eliminations
Operating Segments [Member]
Operating Segments [Member]
Generation All Other Segments [Member]
Generation All Other Segments [Member]
Operating segments that do not meet the quantitative thresholds and thus are not classified as reportable segments for which there is an accounting requirement to report separate financial information on those components in the entity's financial statements.
Intersegment Eliminations [Member]
Intersegment Eliminations [Member]
Segments [Axis]
Segments [Axis]
Segments [Domain]
Segments [Domain]
Generation Total Consolidated Group [Member]
Generation Total Consolidated Group [Member]
This member is equivalent to Exelon Generation Co LLC in most cases for segment reporting except for intersegment activity.The consolidated group for intersegment activity represents activity between the segments within the Generation consolidated group as opposed to the activity between Generation and the Exelon consolidated group.
Generation Mid Atlantic [Member]
Generation Mid Atlantic [Member]
Represents the Mid-Atlantic segment of Exelon Corporation and Exelon Generation Company, LLC.
Generation Midwest [Member]
Generation Midwest [Member]
Represents the Midwest segment of Exelon Corporation and Exelon Generation Company, LLC.
Generation New England [Member]
Generation New England [Member]
Represents the New England segment of Exelon Corporation and Exelon Generation Company, LLC.
Generation New York [Member]
Generation New York [Member]
Generation ERCOT [Member]
Generation ERCOT [Member]
Generation Other Regions [Member]
Generation Other Regions [Member]
Other Segments [Member]
Other Segments [Member]
Generation Reportable Segments Total [Member]
Generation Reportable Segments Total [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
RNF from external customers
Segment Reporting Information Revenue Net Of Purchase Power And Fuel From External Customers
Amount of revenues net of purchased power and fuel expense from external customers.
Intersegment RNF
Segment Reporting Information Intersegment Revenue Net Of Purchase Power And Fuel
Segment Reporting Information, Intersegment Revenue Net of Purchased Power and Fuel Expense
Total RNF
Segment Reporting Information Revenue Net of Purchase Power And Fuel
Amount of total revenues net of purchased power and fuel expense for Generation
Revenues
Revenues
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative [Table]
Derivative [Table]
Related Party [Axis]
Related Party [Axis]
Related Party [Domain]
Related Party [Domain]
Commonwealth Edison Co Affiliate [Member]
Commonwealth Edison Co Affiliate [Member]
Commonwealth Edison Co Affiliate.
PECO Energy Co Affiliate [Member]
PECO Energy Co Affiliate [Member]
Peco Energy Co Related Party Affiliate
Baltimore Gas And Electric Company Affiliate [Member]
Baltimore Gas And Electric Company Affiliate [Member]
Baltimore Gas and Electric Related Party Affiliate
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Related Project [Axis]
Related Project [Axis]
Related Project [Domain]
Related Project [Domain]
Antelope Valle [Member]
Antelope Valle [Member]
Debt issued to fund the Antelope Valley Project
Other Solar Projects [Member]
Other Solar Projects [Member]
PHI Merger [Member]
PHI Merger [Member]
PHI Merger [Member]
ExGen Texas Power [Member]
ExGen Texas Power [Member]
ExGen Texas Power [Member]
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Fair Value Hedging [Member]
Fair Value Hedging [Member]
Cash Flow Hedging [Member]
Cash Flow Hedging [Member]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Interest Rate Swap [Member]
Interest Rate Swap [Member]
Interest Rate Contract [Member]
Interest Rate Contract [Member]
Foreign Exchange Contract [Member]
Foreign Exchange Contract [Member]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Minimum [Member]
Minimum [Member]
Maximum [Member]
Maximum [Member]
Derivative, by Nature [Axis]
Derivative, by Nature [Axis]
Derivative, Name [Domain]
Derivative, Name [Domain]
Derivative [Member]
Derivative [Member]
Designated as Hedging Instrument [Member]
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative [Line Items]
Hypothetical Increase In Interest Rates
Hypothetical Increase In Interest Rates
Represents a hypothetical increase in interest rate percentages to be used in an interest rate sensitivity analysis.
Expected Generation Hedged In Next Twelve Months
Expected Generation Hedged In Next Twelve Months
The percent for the expected/target percentage of future generation being hedged at an electric generation company in the next twelve months. The percentage of expected generation hedged is calculated as the amount of equivalent sales divided by the expected generation. Expected generation represents the amount of energy estimated to be generated or purchased through owned or contracted capacity. Equivalent sales represent all hedging products, which include cash-flow hedges, other derivatives and certain non-derivative contracts including sales to affiliates to serve their retail load.
Expected Generation Hedged In Year Two
Expected Generation Hedged In Year Two
The percent for the expected/target percentage of future generation being hedged at an electric generation company in year two. The percentage of expected generation hedged is calculated as the amount of equivalent sales divided by the expected generation. Expected generation represents the amount of energy estimated to be generated or purchased through owned or contracted capacity. Equivalent sales represent all hedging products, which include cash-flow hedges, other derivatives and certain non-derivative contracts including sales to affiliates to serve their retail load.
Expected generation hedged in year three
Expected Generation Hedged In Year Three
The percent for the expected/target percentage of future generation being hedged at an electric generation company in year three. The percentage of expected generation hedged is calculated as the amount of equivalent sales divided by the expected generation. Expected generation represents the amount of energy estimated to be generated or purchased through owned or contracted capacity. Equivalent sales represent all hedging products, which include cash-flow hedges, other derivatives and certain non-derivative contracts including sales to affiliates to serve their retail load.
Estimated percentage of natural gas purchases hedged
Estimated Percent Of Gas Purchases Being Hedged
The expected/target percentage of future gas purchases being hedged at a gas distribution company. The percentage is calculated as the amount of hedging products divided by the planned natural gas purchases in support of projected firm sales.
Proprietary trading activities volume
Proprietary Trading Volumes
The volume in GWh of energy-related derivative contracts entered into purely to profit from market prices changes as opposed to hedging an exposure.
Derivative, Notional Amount
Derivative, Notional Amount
Notional Amount of Pre-issuance Interest Rate Cash Flow Hedge Derivatives
Notional Amount Of Preissuance Interest Rate Cash Flow Hedge Derivatives
Aggregate notional amount of pre-issuance interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.
Hypothetical increase in interest rates associated with variable-rate debt
Hypothetical Effect of Increase in Interest Rates
Represents a hypothetical increase in interest rate percentages to be used in an interest rate sensitivity analysis.
Increase In Notional Amount Of Derivative Instruments
Increase In Notional Amount Of Derivative Instruments
Increase in derivative notional amount due to additional fixed to float interest swap opened in the third quarter of 2013
Increase In Notional Amount Of Derivative Instruments1
Increase In Notional Amount Of Derivative Instruments1
Increase in derivative notional amount due to additional fixed to float interest swap opened in the first quarter of 2014
Interest rate swaps previously held by acquiree
Interest Rate Swaps Acquiree
Interest rate swaps previously held by acquiree
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments
Ineffective portion recognized in income
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net
DOE interest rate swap
Doe Interest Rate Swap
Interest rate swap entered for the U.S. DOE guarantee for projects under development
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)
Notional amounts on forward starting interest rate swaps
Notional Amounts Forward Starting Interest Rate Swaps
Notional amounts on forward starting interest rate swaps
Mark-to-market derivative liabilities (noncurrent liabilities)
Derivative Liability, Noncurrent
Interest Rate Derivative Assets Noncurrent
Interest Rate Derivative Assets Noncurrent
Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of greater than a year, net of the effects of master netting arrangements.
Derivative Liability, Current
Derivative Liability, Current
Cash collateral received not offset against net derivative positions
Cash Collateral Received Not Offset Against Net Derivative Position
The amount as of the balance sheet date of cash collateral received that was not offset against the fair value of derivative positions.
Credit exposure under natural gas supply and management agreements
Natural Gas Supply And Management Agreement Credit Exposure
Credit exposure under natural gas supply and management agreements.
Cash collateral posted
Cash Collateral Posted
Cash collateral posted related to credit risk.
Letters of credit held
Letters Of Credit Held
Letters of credit held related to credit risk
Net receivable from electric utility
Due From Affiliate Current Electric Utility
Amount of receivables due from a electric entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).
Net receivable from affiliated electric and gas utility
Due From Affiliate Current Electric Gas Utility
Amount of receivables due from a electric and gas entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).
Cash Flow Hedge Gain Loss Reclassified To Pretax Net Income From Accumulated Other Comprehensive Income
Cash Flow Hedge Gain Loss Reclassified To Pretax Net Income From Accumulated Other Comprehensive Income
The impact to pre-tax net income based on the amount of existing gains (losses) on cash flow hedges at the reporting date reclassified to earnings from AOCI.
Expected reclassification from accumulated other comprehensive income to results of operations
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months
Total
Total Credit Risk Exposure
Total credit risk exposure.
Letters of credit posted
Letters Of Credit Posted
Letters of credit posted related to credit risk.
Cash collateral held
Cash Collateral Held
Cash collateral held related to credit risk.
Incremental collateral for loss of investment grade credit rating
Incremental Collateral For Loss Of Investment Grade Credit Rating
Incremental collateral amount required to be provided related to its financial instruments, including derivatives, non-derivatives, normal purchase normal sales contracts and applicable payables and receivables, if the credit rating is downgraded below investment grade.
Interest Rate Fair Value Hedge Asset at Fair Value
Interest Rate Fair Value Hedge Asset at Fair Value
Counter Party With Exposure
Counterparty with Exposure
Counterparty with Exposure
Proprietary Trading [Member]
Proprietary Trading [Member]
Energy-related derivative contracts entered into purely to profit from market prices changes as opposed to hedging an exposure.
Collateral And Netting [Member]
Collateral And Netting [Member]
Application of netting fair value of derivative assets and derivative liabilities in accordance with the entity's accounting policy as well as the offset against collateral under a master netting arrangement.
Mark-to-market derivative assets (current assets)
Derivative Asset, Current
Mark-to-market derivative assets (noncurrent assets)
Derivative Asset, Noncurrent
Total mark-to-market derivative assets
Derivative Asset
Mark-to-market derivative liabilities (current liabilities)
Mark-to-market derivative liabilities (noncurrent liabilities)
Total mark-to-market derivative liabilities
Derivative Liability
Total mark-to-market derivative net assets (liabilities)
Derivative, Fair Value, Net
Current assets collateral offset
Collateral Amount Offset Against Fair Value Of Derivative Current Asset
The amount as of the balance sheet date of cash collateral that was offset against the fair value of derivative current assets.
Noncurrent assets collateral offset
Collateral Amount Offset Against Fair Value Of Derivatives Noncurrent Asset
The amount as of the balance sheet date of cash collateral that was offset against the fair value of derivative noncurrent assets.
Current liabilities collateral offset
Collateral Amount Offset Against Fair Value Of Derivative Current Liability
The amount as of the balance sheet date of cash collateral that was offset against the fair value of derivative current liabilities.
Noncurrent liabilities collateral offset
Collateral Amount Offset Against Fair Value Of Derivative Current Noncurrent Liability
The amount as of the balance sheet date of cash collateral that was offset against the fair value of derivative noncurrent liabilities.
Total cash collateral received net of cash collateral posted
Collateral Received Net Of Collateral Posted Offset Against Fair Value Of Derivative Assets And Liabilities
The amount as of the balance sheet date of cash collateral received net of cash collateral posted that was offset against mark-to-market assets and liabilities.
Schedule of Defined Benefit Plans Disclosures
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Schedule Of Pension And Other Postretirement Benefit Costs
Schedule Of Pension And Other Postretirement Benefit Costs [Table Text Block]
This element may be used to capture the entire pension and other postretirement benefit expense table.
Schedule Of Defined Contributions
Schedule Of Defined Contributions [Table Text Block]
This element may be used to capture the table of contributions by an employer to a defined contribution plan.
Income Statement [Abstract]
Statement [Table]
Statement [Table]
Statement [Line Items]
Statement [Line Items]
Operating revenues [Abstract]
Revenues [Abstract]
Operating revenues
Electrical Generation Revenue
Operating revenues
Electrical Transmission and Distribution Revenue
Operating revenues
Electric and Gas Revenue
Operating revenues from affiliates
Revenue from Related Parties
Operating revenues
Operating expenses
Costs and Expenses [Abstract]
Purchased power and fuel from affiliates
Cost Of Goods And Services Energy Commodities And Services From Affiliate
Total costs incurred and are directly related to energy commodities and services provided during the reporting period from affiliate.
Purchased power and fuel
Cost of Goods and Services, Energy Commodities and Services
Purchased power and fuel
Cost of Purchased Power
Purchased power and fuel from affiliates
Cost Of Purchased Power Affiliate
Cost of electricity purchased and sold during the reporting period from affiliate.
Operating and maintenance
Other Cost and Expense, Operating
Operating and maintenance from affiliates
Related Party Transaction, Expenses from Transactions with Related Party
Depreciation and amortization
Other Depreciation and Amortization
Taxes other than income
Taxes, Miscellaneous
Total operating expenses
Costs and Expenses
Equity in earnings (loss) of unconsolidated affiliates
Income (Loss) from Equity Method Investments
Gain on consolidation of CENG
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net
Operating income
Operating Income (Loss)
Other income and (deductions)
Nonoperating Income (Expense) [Abstract]
Interest expense, net
Interest Expense
Interest expense to affiliates, net
Interest Expense, Related Party
Other, net
Other Nonoperating Income (Expense)
Total other income and (deductions)
Nonoperating Income (Expense)
Income before income taxes
Income (Loss) from Continuing Operations before Income Taxes, Domestic
Income taxes
Income Tax Expense (Benefit)
Net income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Preferred security dividends and redemption
Dividends, Preferred Stock
Net income (loss) attributable to noncontrolling interests
Income (Loss) Attributable to Noncontrolling Interest
Net income (loss) attributable to noncontrolling interest, preferred security dividends and redemption and preference stock dividends
Net Income Loss Attributable To Noncontrolling Interest And Preferred Stock Dividends And Other Adjustments
The portion of net income (loss) attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent combined with the aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders.
Net income attributable to membership interest
Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net income attributable to common shareholders
Net Income (Loss) Available to Common Stockholders, Basic
Other comprehensive income (loss), net of income taxes
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Pension and non-pension postretirement benefit plans:
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]
Prior service (benefit) cost reclassified to periodic benefit cost
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Net of Tax
Actuarial loss reclassified to periodic cost
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax
Pension and non-pension postretirement benefit plans valuation adjustment
Other Comprehensive Income Pension And Non Pension Postretirement Benefit Plan Valuation Adjustment Net Of Tax
The pension and non-pension postretirement benefit plans valuation adjustment, net of income taxes.
Deferred compensation unit valuation adjustment
Deferred Compensation Unit Valuation Adjustment
Unrealized (loss) on cash flow hedges
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax
Unrealized gain (loss) on equity investments
Other Comprehensive Income Unrealized Income Loss On Equity Investments Arising During Period Net Of Tax
Change in accumulated income and losses from certain equity investments during the period being reported on, net of tax.
Unrealized (loss) on foreign currency translation
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax
Unrealized (loss) on marketable securities
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax
Reversal of CENG equity method AOCI
OtherComprehensiveIncomeLossNetOfTaxPeriodDecrease
OtherComprehensiveIncomeLossNetOfTaxPeriodDecrease
Other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax
Comprehensive income
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Average shares of common stock outstanding:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Average common shares outstanding — basic
Weighted Average Number of Shares Outstanding, Basic
Average common shares outstanding — diluted
Weighted Average Number of Shares Outstanding, Diluted
Earnings per average common share:
Earnings Per Share, Basic [Abstract]
Earnings per share - basic (in usd per share)
Earnings Per Share, Basic
Earnings per average common share - diluted
Earnings Per Share, Diluted [Abstract]
Earnings per share - diluted (in usd per share)
Earnings Per Share, Diluted
Dividends per common share (in usd per share)
Common Stock, Dividends, Per Share, Cash Paid
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping [Table]
Measurement Basis [Axis]
Measurement Basis [Axis]
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Portion at Fair Value Measurement [Member]
Portion at Fair Value Measurement [Member]
Reported Value Measurement [Member]
Reported Value Measurement [Member]
Estimate of Fair Value Measurement [Member]
Estimate of Fair Value Measurement [Member]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value Hierarchy [Domain]
Fair Value Hierarchy [Domain]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Short-term liabilities
Shortterm Liabilities Fair Value
This item represents the amount of certain short-term liabilities existing as of the balance sheet date.
Long-term debt (including amounts due within one year)
Debt Instrument, Fair Value Disclosure
Long-term debt to financing trusts
Long Term Debt To Financing Trusts Fair Value Disclosure
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Fair value of Long-term debt to other financing trusts at the balance sheet date.
SNF obligation
Spent Nuclear Fuel Obligations Fair Value Disclosure
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Fair value of spent nuclear fuel obligations at the balance sheet date.
Business Combinations [Abstract]
Mergers, Acquisitions and Dispositions
Business Combination Disclosure [Text Block]
Changes in Accumulated Other Comprehensive Income [Abstract]
Changes in Accumulated Other Comprehensive Income [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Schedule Of Other Comprehensive Income Loss Tax
Schedule Of Other Comprehensive Income Loss Tax [Table Text Block]
Schedule Of Other Comprehensive Income Loss Tax
Commitments and Contingencies Disclosure [Abstract]
Unrecorded Unconditional Purchase Obligation [Table]
Unrecorded Unconditional Purchase Obligation [Table]
Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis]
Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis]
Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain]
Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain]
Other Purchase Obligations [Member]
Other Purchase Obligations [Member]
Net Capacity Purchases [Member]
Net Capacity Purchases [Member]
Power Purchases [Member]
Power Purchases [Member]
Transmission Rights Purchases [Member]
Transmission Rights Purchases [Member]
Energy Supply Procurement [Member]
Energy Supply Procurement [Member]
Energy Supply Procurement Member
Renewable Energy Including Renewable Energy Credits [Member]
Renewable Energy Including Renewable Energy Credits [Member]
DSP Program Electric Procurement Contracts [Member]
DSP Program Electric Procurement Contracts [Member]
Represents the regulatory asset related to an entity's mark-to-market derivative liability position in electric supply procurement contracts.
Alternative Energy Credits [Member]
Alternative Energy Credits [Member]
Curtailment Services [Member]
Curtailment Services [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]
Total
Unrecorded Unconditional Purchase Obligation
2014
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months
2015
Unrecorded Unconditional Purchase Obligation, Due within Two Years
2016
Unrecorded Unconditional Purchase Obligation, Due within Three Years
2017
Unrecorded Unconditional Purchase Obligation, Due within Four Years
2018
Unrecorded Unconditional Purchase Obligation, Due within Five Years
Thereafter
Unrecorded Unconditional Purchase Obligation, Due after Five Years
Operating Leases, Future Minimum Payments Receivable [Abstract]
Operating Leases, Future Minimum Payments Receivable [Abstract]
2014
Operating Leases, Future Minimum Payments Receivable, Current
2015
Operating Leases, Future Minimum Payments Receivable, in Two Years
2016
Operating Leases, Future Minimum Payments Receivable, in Three Years
2017
Operating Leases, Future Minimum Payments Receivable, in Four Years
2018
Operating Leases, Future Minimum Payments Receivable, in Five Years
Thereafter
Operating Leases, Future Minimum Payments Receivable, Thereafter
Segment Information (Exelon, Generation, ComEd, PECO and BGE)
Segment Reporting Disclosure [Text Block]
Regulated Operations [Abstract]
Schedule of Regulatory Assets
Schedule of Regulatory Assets [Table Text Block]
Schedule of Regulatory Liabilities
Schedule of Regulatory Liabilities [Table Text Block]
Purchase Of Receivables
Purchase Of Receivables [Table Text Block]
ComEd, PECO and BGE are required, under separate legislation and regulations in Illinois,Pennsylvania and Maryland, respectively, to purchase certain receivables from retail electric and natural gas suppliers.
Proprietary Trading Activities Gain Loss By Income Statement Location [Axis]
Proprietary Trading Activities Gain Loss By Income Statement Location [Axis]
The income statement location that the gain/loss on proprietary trading activities could be reported under.
Proprietary Trading Activities Income Location [Domain]
Proprietary Trading Activities Income Location [Domain]
The income statement line descriptions that the gain/loss on proprietary trading activities could be reported under.
Operating Revenue [Member]
Operating Revenue [Member]
This element represents the gains (losses) included in earnings that are recognized in operating revenues.
Proprietary Trading Activities Change In Fair Value
Proprietary Trading Activities Change In Fair Value
Represents the pre-tax mark-to-market gains or losses of certain purchase and sale contracts due to the change in fair value of the derivative contracts held at the reporting date. These contracts are entered into purely to profit from market prices changes as opposed to hedging an exposure.
Proprietary Trading Activities Reclassification To Realized At Settlement
Proprietary Trading Activities Reclassification To Realized At Settlement
Represents the pre-tax mark-to-market gains or losses of certain purchase and sale contracts due to the recognized change in fair value that was reclassified to realized due to settlement of the derivative during the period. These contracts are entered into purely to profit from market prices changes as opposed to hedging an exposure.
Proprietary Trading Activities Gain Loss Net
Proprietary Trading Activities Gain Loss Net
Net pre-tax mark-to-market gain or loss on derivative contracts that were entered into purely to profit from market prices changes as opposed to hedging an exposure.
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Fair Value Assets Measured On Recurring Basis Investments Valuation Techniques
Fair Value Assets Measured On Recurring Basis Investments Valuation Techniques [Policy Text Block]
This element represents, for annual periods only, the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period.
Fair Value Assets Measured On Recurring Basis Cash And Cash Equivalents Valuation Techniques
Fair Value Assets Measured On Recurring Basis Cash And Cash Equivalents Valuation Techniques [Policy Text Block]
This element represents, for annual periods only, the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period.
Fair Value Assets Measured On Recurring Basis Nuclear Decommissioning Trust Fund Investments Valuation Techniques
Fair Value Assets Measured On Recurring Basis Nuclear Decommissioning Trust Fund Investments Valuation Techniques [Policy Text Block]
This element represents, for annual periods only, the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period.
Fair Value Assets And Liabilities Measured On Recurring Basis Derivative Financial Instruments Assets And Liabilities Valuation Techniques
Fair Value Assets And Liabilities Measured On Recurring Basis Derivative Financial Instruments Assets And Liabilities Valuation Techniques [Policy Text Block]
This element represents, for annual periods only, the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period.
Fair Value Liabilities Measured On Recurring Basis Obligations Valuation Techniques
Fair Value Liabilities Measured On Recurring Basis Obligations Valuation Techniques [Policy Text Block]
This element represents, for annual periods only, the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period.
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Equity Method Investments [Table]
Schedule of Equity Method Investments [Line Items]
Schedule of Equity Method Investments [Line Items]
Schedule of total equity in earnings of investment in CENG
Schedule Of Income Loss From Equity Method Investments [Text Block]
This element may be used to capture the table showing the different components of income or loss from equity method investments.
Purchase Of Receivables [Table]
Purchase Of Receivables [Table]
Purchase Of Receivables [Line Items]
Purchase Of Receivables [Line Items]
Purchased receivables
Por Gross Receivables
Outstanding gross receivables purchased under the POR program.
Allowance for uncollectible accounts
Por Allowance
Allowance for uncollectible accounts on POR receivables
Purchased receivables, net
Por Net Receivables
Outstanding net receivables purchased under the POR program.
Discount rate
Purchase of Receivables, Discount Rate related to Implementation Costs
Purchase of Receivables, Discount Rate related to Implementation Costs
Schedule of Error Corrections and Prior Period Adjustment Restatement [Table]
Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
Scenario Adjustment [Member]
Scenario, Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total interest expense to affiliates, net
Pretax decrease in operating and maintenance expense
Electrical Transmission and Distribution Revenue
Pretax increase in taxes other than income
Environmental Remediation Obligations [Abstract]
Schedule Of Nuclear Decommissioning [Table]
Schedule Of Nuclear Decommissioning [Line Items]
Schedule Of Nuclear Decommissioning [Line Items]
Nuclear decommissioning asset retirement obligation rollforward
Nuclear Decommissioning Asset Retirement Obligation Rollforward [Text Block]
Table providing a rollforward of the nuclear decommissioning ARO from prior year end to current period.
Unrealized Gains (Losses) on nuclear decommissioning trust funds
Unrealized Gains Losses On Nuclear Decommissioning Trust Funds [Text Block]
Table providing unrealized gains and losses on NDT funds.
Zion Station pledged assets
Nuclear Decommissioning Pledged Assets [Table Text Block]
Nuclear Decommissioning (Exelon and Generation)
Asset Retirement Obligation Disclosure [Text Block]
Regulatory Matters (Exelon, Generation, ComEd, PECO and BGE)
Public Utilities Disclosure [Text Block]
Reclassification out of Accumulated Other Comprehensive Income [Table]
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Defined Benefit Plans Adjustment [Member]
Equity Method Investments
Equity Method Investments [Member]
Energy Related Derivative [Member]
Energy Related Derivative [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes
Income taxes
Prior service benefit reclassified to periodic benefit cost
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Tax
Other Nonoperating Income (Expense)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax
Gain on consolidation of CENG
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain
Interest Expense
Property, Plant and Equipment [Abstract]
Schedule of Capital Leased Assets
Schedule of Capital Leased Assets [Table Text Block]
Supplemental Financial Information [Abstract]
Supplemental Financial Information [Abstract]
Components of non-operating income and expenses
Schedule of Other Nonoperating Income, by Component [Table Text Block]
Components of depreciation, amortization and accretion, and other, net
Schedule Of Depreciation Amortization Accretion Disclosures [Text Block]
This element may be used to capture the table showing the different components of depreciation, amortization and accretion expense.
Cash Flow Supplemental Disclosures
Cash Flow, Supplemental Disclosures [Text Block]
Supplemental Balance Sheet Disclosures
Supplemental Balance Sheet Disclosures [Text Block]
Variable Interest Entity [Abstract]
Variable Interest Entity [Abstract]
Schedule of Variable Interest Entities [Table]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Domain]
Financial Guarantee [Member]
Financial Guarantee [Member]
Payment Guarantee [Member]
Payment Guarantee [Member]
Constellation Energy Nuclear Group [Member]
Constellation Energy Nuclear Group [Member]
Represents a joint venture relating to a nuclear generation and operation business.
Variable Interest Entities [Axis]
Variable Interest Entities [Axis]
Variable Interest Entity, Classification [Domain]
Variable Interest Entity, Classification [Domain]
Equity Method Investment Variable Interest Entities [Member]
Equity Method Investment Variable Interest Entities [Member]
RSB Bond Co LLC [Member]
RSB Bond Co LLC [Member]
Represents the consolidated variable interest entity of the reporting entity.
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entities By Type Of Entity [Axis]
Variable Interest Entities By Type Of Entity [Axis]
Variable Interest Entities By Type [Domain]
Variable Interest Entities By Type [Domain]
Variable Interest Entity [Line Items]
Variable Interest Entity [Line Items]
Number of Variable Interest Entities not consolidated by equity holders
Number Of Variable Interest Entities Not Consolidated
The number of variable interest entities (VIEs) not consolidated.
Number Of Variable Interest Entities Consolidated
Number Of Variable Interest Entities Consolidated
The number of variable interest entities (VIEs) consolidated.
Equity Method Investment, Ownership Percentage
Equity Method Investment, Ownership Percentage
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain
Remittance of payments received from customers for rate stabilization to BondCo.
Amount Remitted To Variable Interest Entities On Rate Stabilization Bonds
The amount remitted to variable interest entities for rate stabilization bonds.
Related Party Transaction Required Purchase Of Power Percentage
Related Party Transaction Required Purchase Of Power Percentage
Represents the required purchases of power from a related party, that is not sold to third parties, over the specified term of a power purchase agreement, percent.
Due from Affiliates
Due from Affiliates
Severance Benefits Obligations Balance
Severance Benefits Obligations Balance
Represents the liability recorded for severance benefits obligations as of the balance sheet date related to the corporate restructuring program.
Guarantor Obligations, Current Carrying Value
Guarantor Obligations, Current Carrying Value
Related Party Purchase Of Nuclear Output By Third Party Percentage
Related Party Purchase Of Nuclear Output By Third Party Percentage
This element represents the percentage of nuclear output to be purchased by third party.
Payables to affiliates
Due to Affiliate
Guarantor Obligations, Maximum Exposure, Undiscounted
Guarantor Obligations, Maximum Exposure, Undiscounted
Payments for Restructuring
Payments for Restructuring
Earnings Per Share [Abstract]
Statement Of Equity [Table]
Statement Of 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]
Equity Forward Units [Member]
Equity Forward Units [Member]
Equity Forward Units issued in connection with the junior subordinated notes issued by Exelon to fund the PHI merger.
Option Indexed to Issuer's Equity, Type [Axis]
Option Indexed to Issuer's Equity, Type [Axis]
Option Indexed to Issuer's Equity, Type [Domain]
Option Indexed to Issuer's Equity, Type [Domain]
Employee Stock Option [Member]
Employee Stock Option [Member]
Major Types of Debt and Equity Securities [Axis]
Major Types of Debt and Equity Securities [Axis]
Major Types of Debt and Equity Securities [Domain]
Major Types of Debt and Equity Securities [Domain]
Equity units issued [Member]
Equity units issued [Member]
Equity units issued in connection with the conversion feature of Junior subordinate note
Statement Of Equity Line Item [Line Items]
Statement Of Equity Line Item [Line Items]
Statement Of Equity [Line Items]
Stock options not included in the calculation of diluted common shares outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Treasury Stock, Shares held
Treasury Stock, Shares
Treasury Stock, Value
Treasury Stock, Value
Preferred Stock Redemption Premium
Preferred Stock Redemption Premium
PECO Cumulative Preferred Securities Redeemable
Stock Redeemed or Called During Period, Value
Accrual For Environmental Loss Contingencies [Table]
Accrual For Environmental Loss Contingencies [Table]
Accrual For Environmental Loss Contingencies [Table]
Environmental Remediation Contingency [Axis]
Environmental Remediation Contingency [Axis]
Environmental Remediation Contingency [Domain]
Environmental Remediation Contingency [Domain]
Cotter Corporation [Member]
Cotter Corporation [Member]
Sixty-Eighth Street Dump [Member]
Sixty-Eighth Street Dump [Member]
Rossville ash site [Member]
Rossville ash site [Member]
Accrual For MGP Investigation And Remediation [Member]
Accrual For MGP Investigation And Remediation [Member]
Represents the portion of the total environmental investigation and remediation reserve related to manufactured gas plant investigation and remediation.
Midwest Generation, LLC [Member]
Midwest Generation, LLC [Member]
Accrual For Environmental Loss Contingencies [Line Items]
Accrual For Environmental Loss Contingencies [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.
Total number of MGP sites
Mgp Site Contingency Count
Total number of individual manufactured gas plant sites with associated possible environmental loss contingencies related to remediation.
Approved clean-up
Mgp Site Contingency Approved Cleanup Count
Number of individual manufactured gas plant sites at which the respective state environmental agency has approved a cleanup plan.
Sites under study/remediation
Mgp Site Contingency Monitoring Count
Number of individual manufactured gas plant sites where monitoring or remediation activities are occurring.
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)
Low end of range of cooling tower cost
Site Contingency, Loss Exposure Not Accrued, Low Estimate
Consent decree penalty
Consent Decree Penalty
The penalty assessed under a consent decree.
Environmental loss contingencies
Accrual for Environmental Loss Contingencies, Component Amount
States subject to the Cross State Air Pollution Rule
States Subject To Cross State Air Pollution Rule
Number of states subject to the Cross State Air Pollution Rule (CSAPR)
Emissions allowance balance
Emissions Allowance Balance
Emission Credits Or Allowances Balance.
Net investment in long-term direct financing leases
Capital Leases, Net Investment in Direct Financing Leases
Payments for operating leases
Payment Of Operating Lease
Payments for operating leases.
Coal Rail Car Lease Proof of Claims
Bankruptcy Claims, Amount of Claims Filed
Increase (decrease) in the value of the asbestos liability reserve
Asbestos Loss Contingency Accrual Period Increase Decrease
Net change in the accrual for asbestos-related loss contingencies during the reporting period.
Midwest Generation's estimated environmental investigation and remediation costs
Environmental Exit Costs, Assets Previously Disposed, Liability for Remediation
Total cost of remediation to be shared by PRPs
Site Contingency, Loss Exposure Not Accrued, Best Estimate
DOJ potential settlement
Environmental Exit Costs, Reasonably Possible Additional Losses, High Estimate
Loss Contingency, Number of Defendants
Loss Contingency, Number of Defendants
Number Of Stations Violating Clean Air Act
Number Of Stations Violating Clean Air Act
Number of sites according to the US EPA that have violated and continue to violate several provisions of the Clean Air Act
Loss Contingency Number Of Parties Jointly And Severally Liable In Environmental Protection Agency Action
Loss Contingency Number Of Parties Jointly And Severally Liable In Environmental Protection Agency Action
Identifies number of individuals or entities that are co-defendants in an EPA Investigation.
Minimum estimated clean-up costs for all potentially responsible parties
Loss Contingency, Range of Possible Loss, Minimum
Maximum estimated clean-up costs for all potentially responsible parties
Loss Contingency, Range of Possible Loss, Maximum
Loss Contingency, Estimate of Possible Loss
Loss Contingency, Estimate of Possible Loss
Minimum GHG emissions by stationary sources to qualify for regulation
Minimum Ghg Emissions Required For Eligibility For Stationary Source Permitting
Represents the minimum level, in tons per year, of GHG emissions required to be eligible for permitting regulation proposed by the U.S. Environmental Protection Agency.
Minimum additional GHG emissions by stationary sources after a modification
Minimum Additional Ghg Emissions Required For Eligibility For Stationary Source Permitting After Modifications
Represents the minimum increase as a result of a modification to a major stationary emissions source, in tons per year, of GHG emissions required to be eligible for permitting regulation proposed by the U.S. Environmental Protection Agency.
Effective Number Of Years For Tailoring Rule
Effective Number Of Years For Tailoring Rule
Effective number of years for the Tailoring Rule under the Clean Air Act.
Changes in Accumulated Other Comprehensive Income (Exelon, Generation, ComEd, PECO and BGE)
Accumulated Other Comprehensive Income Loss [Text Block]
Major classes of assets and liabilities held for sale
Disclosure of Long Lived Assets Held-for-sale [Table Text Block]
Retirement Benefits (Exelon, Generation, ComEd, PECO and BGE)
Pension and Other Postretirement Benefits Disclosure [Text Block]
Schedule of Variable Interest Entities [Table]
Current Assets
VariableInterestEntityConsolidatedCarryingAmountCurrentAssets
VariableInterestEntityConsolidatedCarryingAmountCurrentAssets
Non Current Assets
Variable Interest Entity Consolidated Carrying Amount Non Current Assets
VariableInterestEntityConsolidatedCarryingAmountNonCurrentAssets
Total Assets
Variable Interest Entity, Consolidated, Carrying Amount, Assets
Current Liabilities
Variable Interest Entity Consolidated Carrying Amount Current Liabilities
Variable Interest Entity Consolidated Carrying Amount Current Liabilities
Non Current Liabilities
Variable Interest Entity Consolidated Carrying Amount Non Current Liabilities
Variable Interest Entity Consolidated Carrying Amount Non Current Liabilities
Total Liabilities
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities
Assets
Assets
Total liabilities
Liabilities
Fair Value of Financial Assets and Liabilities (Exelon, Generation, ComEd, PECO and BGE)
Fair Value Disclosures [Text Block]
Schedule of Equity Method Investments [Table]
Investment, Name [Axis]
Investment, Name [Axis]
Investment, Name [Domain]
Investment, Name [Domain]
Current assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets
Nuclear decommissioning trust fund
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNDTFund
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNDTFund
Property, plant and equipment
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment
Nuclear fuel
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNuclearFuel
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNuclearFuel
Other assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets
Total assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets
Current liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities
Asset retirement obligation
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Asset Retirment Obligations
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetRetirmentObligations
Pension and other employee benefit obligations
Postconfirmation, Pension Obligations
Unamortized energy contract liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities
Other liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other
Total liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities
Total net assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net
Consolidation Items [Axis]
Consolidation Items [Axis]
Consolidation Items [Domain]
Consolidation Items [Domain]
Corporate, Non-Segment [Member]
Corporate, Non-Segment [Member]
Mark-to-market derivative assets (current assets)
Interest Rate Derivative Assets Current
Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.
Mark-to-market derivative assets (noncurrent assets)
Total mark-to-market derivative assets
Total Interest Rate Mark To Market Derivative Assets
Total fair value mark-to-market derivative assets as of the balance sheet date.
Mark-to-market derivative liabilities (current liabilities)
Interest Rate Derivative Liabilities Current
Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.
Mark-to-market derivative liabilities (noncurrent liabilities)
Interest Rate Derivative Liabilities Noncurrent
Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of greater than a year, net of the effects of master netting arrangements.
Total mark-to-market derivative liabilities
Total Interest Rate Mark To Market Derivative Liabilities
Total fair value mark-to-market derivative liabilities as of the balance sheet date.
Total mark-to-market derivative net assets (liabilities)
Interest Rate Derivative Fair Value Of Derivative Net
Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives.
Estimated residual value of leased assets
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property
Less: unearned income
Capital Leases, Net Investment in Direct Financing Leases, Deferred Income
Net investment in long-term leases
Other Segment [Member]
Other Segment [Member]
Represents the corporate operations of an entity.
Segment Elimination [Member]
Segment Elimination [Member]
Segment Elimination Member created to differentiate between Intersegment Elimination member
Corporate and Other [Member]
Corporate and Other [Member]
Revenue from Related Parties
Net income (loss)
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension and non-pension postretirement benefit plans:
Pension and Other Postretirement Benefit Expense [Abstract]
Actuarial gain (loss) reclassified to periodic cost
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Tax
Pension and non-pension postretirement benefit plans valuation adjustment
Other Comprehensive Income Pension And Non Pension Postretirement Benefit Plan Valuation Adjustment Tax
Tax effect of the pension and non-pension postretirement benefit plans valuation adjustment.
Change in unrealized gain (loss) on cash flow hedges
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax
Change in unrealized income on equity investments
Other Comprehensive Income Unrealized Gain Loss On Equity Investments Arising During Period Tax
Tax effect of the change in unrealized gains and losses from equity investments held during the period being reported on.
Deferred compensation unit valuation adjustment
Deferred Compensation Unit Valuation Adjustment tax
Tax impact of Deferred Compensation Unit Valuation Adjustment
Change in marketable securities
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax
Total
Other Comprehensive Income (Loss), Tax
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Statement of Financial Position [Abstract]
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Assets [Abstract]
Assets [Abstract]
Assets, Current [Abstract]
Assets, Current [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Restricted cash and cash equivalents
Restricted Cash and Cash Equivalents, Current
Accounts receivable, net
Accounts Receivable, Net, Current [Abstract]
Customer
Accounts Receivable, Net, Current
Other
Other Receivables
Mark-to-market derivative assets
Unamortized energy contract assets
Energy Marketing Contracts Assets, Current
Income taxes receivable
Income Taxes Receivable, Current
Receivables from affiliates
Due from Affiliate, Current
Receivable from Exelon intercompany money pool
Due from Related Parties, Current
Inventories, net
Inventory, Net [Abstract]
Fossil fuel
Energy Related Inventory, Other Fossil Fuel
Materials and supplies
Inventory, Raw Materials and Supplies, Gross
Deferred income taxes
Deferred Tax Assets, Net of Valuation Allowance, Current
Regulatory assets
Regulatory Assets, Current
Assets held for sale
Assets Held-for-sale, Current
Other
Other Assets, Current
Prepaid utility taxes
Prepaid Taxes
Inventories, net
Inventory, Net
Total current assets
Assets, Current
Property, plant and equipment, net
Property, Plant and Equipment, Net
Deferred debits and other assets
Other Assets, Noncurrent [Abstract]
Regulatory assets
Regulatory Assets, Noncurrent
Nuclear decommissioning trust funds
Decommissioning Fund Investments
Investments
Long-term Investments
Investments in affiliates
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Investment in CENG
Equity Method Investments
Goodwill
Goodwill
Mark-to-market derivative assets
Unamortized energy contracts assets
Energy Marketing Contracts Assets, Noncurrent
Pledged assets for Zion Station decommissioning
Assets Held-in-trust, Noncurrent
Other
Other Assets, Noncurrent
Receivable from affiliate
Due from Affiliate, Noncurrent
Prepaid pension asset
Prepaid Pension Costs
Total deferred debits and other assets
Total Deferred Debits And Other Assets
Total deferred debits and other assets.
Total assets
Liabilities and Equity [Abstract]
Liabilities and Equity [Abstract]
Liabilities, Current [Abstract]
Liabilities, Current [Abstract]
Short-term borrowings
Short-term Debt
Long-term debt due within one year
Long-term Debt and Capital Lease Obligations, Current
Accounts payable
Accounts Payable, Current
Accrued expenses
Accrued Liabilities, Current
Payables to affiliates
Due to Affiliate, Current
Deferred income taxes
Deferred Tax Liabilities, Net, Current
Regulatory liabilities
Regulatory Liability, Current
Mark-to-market derivative liabilities (current liabilities)
Unamortized energy contract liabilities
Energy Marketing Contract Liabilities, Current
Other
Other Liabilities, Current
Customer deposits
Customer Deposits, Current
Total current liabilities
Liabilities, Current
Long-term debt
Long-term Debt, Excluding Current Maturities
Long-term debt to financing trusts
Due to Related Parties, Noncurrent
Long-term debt to affiliate
Long Term Debt To Affiliate
Long term debt to affiliates
Deferred credits and other liabilities
Other Liabilities, Noncurrent [Abstract]
Deferred income taxes and unamortized investment tax credits
Deferred Income Taxes And Unamortized Investment Tax Credits
Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference. Additionally, this element includes the future effects on income taxes attributable to investment tax credits.
Asset retirement obligations
Asset Retirement Obligations, Noncurrent
Pension obligations
Defined Benefit Pension Plan, Liabilities, Noncurrent
Non-pension postretirement benefit obligations
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent
Spent nuclear fuel obligation
Spent Nuclear Fuel Obligation, Noncurrent
Regulatory liabilities
Regulatory Liability, Noncurrent
Unamortized energy contract liabilities
Energy Marketing Contract Liabilities, Noncurrent
Payable for Zion Station decommissioning
Decommissioning Liability, Noncurrent
Other
Other Liabilities, Noncurrent
Payables to affiliates
Due to Affiliate, Noncurrent
Total deferred credits and other liabilities
Total Deferred Credits And Other Liabilities
Total deferred credits and other liabilities.
Commitments and contingencies
Commitments and Contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Attributable to Parent [Abstract]
Common stock
Common Stock, Value, Issued
Treasury stock, at cost (35 shares at both September 30, 2014 and December 31, 2013)
Retained earnings
Retained Earnings (Accumulated Deficit)
Other paid-in capital
Additional Paid in Capital
Accumulated other comprehensive loss, net
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total shareholders’ equity
Stockholders' Equity Attributable to Parent
BGE preference stock not subject to mandatory redemption
Preferred Stock, Value, Issued
Noncontrolling interest
Stockholders' Equity Attributable to Noncontrolling Interest
Total equity
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Total liabilities and shareholders’ equity
Liabilities and Equity
Total liabilities and shareholders' equity
Liabilities And Stockholders Equity Including Portion Attributable To Noncontrolling Interest
Liabilities and total of Stockholders' Equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity including portions attributable to both the parent and noncontrolling interests (previously referred to as minority interest), if any. The entity including portions attributable to the parent and noncontrolling interests is sometimes referred to as the economic entity. This excludes temporary equity and is sometimes called permanent equity.
Equity
Members Equity Including Portion Attributable To Noncontrolling Interest [Abstract]
Members' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Member’s equity
Members' Equity [Abstract]
Membership interest
Membership Interests
An ownership interest in a limited liability company
Undistributed earnings
Members Equity Retained Earnings
Cumulative undistributed earnings of an entity; shall be considered to be part of member's equity.
Total member's equity
Members' Equity
Total equity
Members Equity Including Portion Attributable To Noncontrolling Interest
Total of member's equity (deficit) items, including portions attributable to both the parent and noncontrolling interests (previously referred to as minority interest), if any. The entity including portions attributable to the parent and noncontrolling interests is sometimes referred to as the economic entity. This excludes temporary equity and is sometimes called permanent equity.
Total liabilities and equity
Liabilities And Members Equity
Total liabilities and member's equity.
Fair Value Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table]
Summarization of information required and determined to be provided for purposes of reconciling beginning and ending balances of fair value measurements of assets and liabilities using significant unobservable inputs (Level 3). Such reconciliation, separately presenting changes during the period, at a minimum, may include: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs).
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation By Asset Liability Type [Axis]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation By Asset Liability Type [Axis]
This element represents a number of concepts which are required or determined to be provided for purposes of reconciling beginning and ending balances of fair value measurements of assets and liabilities using significant unobservable inputs (Level 3). Such reconciliation, separately presenting changes during the period, at a minimum, may include: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs).
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Inputs Reconciliation Asset Types [Domain]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Inputs Reconciliation Asset Types [Domain]
This element provides general categories of investment (assets and liabilities) for which the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs).
Nuclear Decommissioning Trust Fund Investment Level Three Asset [Member]
Nuclear Decommissioning Trust Fund Investment Level Three Asset [Member]
Pledged Assets For Zion Station Decommissioning [Member]
Pledged Assets For Zion Station Decommissioning [Member]
This element represents the assets measured at fair value on a recurring basis related to pledged assets for Zion Station decommissioning.
Other Investments [Member]
Other Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [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.
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Beginning balance
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Value
This element represents an asset or liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.
Total realized / unrealized gains (losses)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss [Abstract]
This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3).
Included in net income
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Earnings
This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings.
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates.
Included in payable for Zion Station decommissioning
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable
This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in a payable for nuclear power station decommissioning.
Included in noncurrent payables to affiliates
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Regulatory Assets Liabilities
This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in regulatory assets or liabilities.
Change in collateral
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral
Fair value measurement with unobservable inputs reconciliation recurring basis asset liability gain loss change in collateral.
Purchases, sales, issuances and settlements
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Purchases Sales Issuances Settlements [Abstract]
Purchases, sales, issuances, and settlements abstract.
Purchases
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases
Sales
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales
Settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements
Transfers into Level 3
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Transfers In
This element represents transfers in of assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.
Transfers out of Level 3
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Transfers Out
This element represents transfers out of assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.
Ending balance
The amount of total losses included in income attributed to the change in unrealized gains (losses) related to assets and liabilities held
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Total Gain Loss Included In Earnings Attributed To Changes In Unrealized Gains Losses
This element represents total unrealized gains or losses for the period, arising from the change in fair value related to assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), held as of the balance sheet date.
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Gain (loss) reclassified to results of operating due to the settlement of derivative contracts
Derivative Gain Loss Reclassified To Earnings Net
This element represents realized gains or losses that are reclassified to results of operations due to the settlement of all derivative contracts during the respective period.
Decrease in Fair Value Adjustment
Decrease in Fair Value Adjustment
Decrease in Fair Value Adjustment
Increase In Fair Value Adjustment
Increase In Fair Value Adjustment
Increase in fair value adjustment related to purchase accounting as a result of the exchnage offer.
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Translation Adjustment [Member]
Accumulated Translation Adjustment [Member]
Accumulated Equity Investment [Member]
Accumulated Equity Investment [Member]
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance
OCI before reclassifications
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax
Amounts reclassified from AOCI
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Net current-period OCI
Ending balance
Accrual For Environmental Loss Contingencies Material Components [Axis]
Accrual For Environmental Loss Contingencies Material Components [Axis]
Accrual For Environmental Loss Contingencies Material Components [Domain]
Accrual For Environmental Loss Contingencies Material Components [Domain]
Accrual For Environmental Loss Contingencies Material Components [Domain]
Total Accrual For Environmental Loss Contingencies [Member]
Total Accrual For Environmental Loss Contingencies [Member]
Represents the total environmental investigation and remediation reserve.
Accrued environmental liabilities
Accrual for Environmental Loss Contingencies
Assets Disposition Table [Table]
Assets Disposition Table [Table]
Assets Disposition Table [Table]
Long Lived Assets Held-for-sale by Asset Type [Axis]
Long Lived Assets Held-for-sale by Asset Type [Axis]
Long Lived Assets Held-for-sale, Name [Domain]
Long Lived Assets Held-for-sale, Name [Domain]
Electricity Generation Plant, Non-Nuclear [Member]
Electricity Generation Plant, Non-Nuclear [Member]
Assets Disposition Table [Line Items]
Assets Disposition Table [Line Items]
[Line Items] for Assets Disposition Table [Table]
Property, plant and equipment, net (a)
Assets Held-for-sale, Property, Plant and Equipment
Inventory
Inventories, Property Held-for-sale, Current
Current assets
Other Assets Held-for-sale, Current
Total assets held for sale
Accounts payable
Accounts Payable, Trade, Current
Accrued expenses
Other current liabilities
Total liabilities held for sale (b)
Liabilities of Assets Held-for-sale
Asset Impairment Charges
Asset Impairment Charges
Nuclear Decommissioning Additional Narrative Information [Table]
Nuclear Decommissioning Additional Narrative Information [Table]
Public Utility [Axis]
Public Utility [Axis]
Utility Plant [Domain]
Utility Plant [Domain]
Nuclear Plant [Member]
Nuclear Plant [Member]
Limerick and Three Mile Island Nuclear Units [Member]
Limerick and Three Mile Island Nuclear Units [Member]
Limerick and Three Mile Island Nuclear Units [Member]
Nuclear Decommissioning Additional Narrative Information [Line Items]
Nuclear Decommissioning Additional Narrative Information [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.
Asset Retirement Obligation, Period Increase (Decrease)
Asset Retirement Obligation, Period Increase (Decrease)
Other Income
Other Income
Nuclear Decommissioning Annual Recovery Current
Nuclear Decommissioning Annual Recovery Current
Current annual recovery of nuclear decommissioning costs from customers filed with state regulator
Decommissioning Shortfall
Decommissioning Shortfall
Amount of decommissioning shortfall with recourse for collection from customers.
Decommissioning Shortfall Percentage
Decommissioning Shortfall Percentage
Percent of additional decommissioning shortfall with recourse for collection from customers.
Half Of Non Decommissioning Withdraw
Half Of Non Decommissioning Withdraw
Half Of Non Decommissioning Withdraw
Decommissioning Fund Investments
Decommissioning Liability, Noncurrent
Additional NRC Funding Assurance Parent Guarantees
Additional NRC Funding Assurance Parent Guarantees
Additional guarantees potentially required by the Parent Company to cover the NRC underfunded position.
Basis of Presentation (Exelon, Generation, ComEd, PECO and BGE)
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Statement of Cash Flows [Abstract]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income
Adjustments to reconcile net income to net cash flows provided by operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, amortization, depletion and accretion, including nuclear fuel and energy contract amortization
Depreciation, Amortization and Accretion, Net
Impairment of long-lived assets
Impairment of Long-Lived Assets Held-for-use
Gain on consolidation of CENG
Equity Method Investment, Realized Gain (Loss) on Disposal
Gain on sale of assets
Gain (Loss) on Sale of Assets and Asset Impairment Charges
Deferred income taxes and amortization of investment tax credits
Deferred Income Taxes and Tax Credits
Net fair value changes related to derivatives
Unrealized Gain (Loss) on Derivatives
Net realized and unrealized gains on nuclear decommissioning trust fund investments
Gain (Loss) on Investments
Other non-cash operating activities
Other Noncash Income (Expense)
Changes in assets and liabilities:
Increase (Decrease) in Operating Capital [Abstract]
Accounts receivable
Increase (Decrease) in Receivables
Receivables from and payables to affiliates, net
Change Receivables Payables From Affiliates
The net change in related receivables and payables from entities that are affiliated with the reporting entity by means of direct or indirect ownership. A positive value indicates a decrease in the net receivable or an increase in the net payable, while a negative value indicates an increase in the net receivable or a decrease in the net payable.
Inventories
Increase (Decrease) in Inventories
Accounts payable, accrued expenses and other current liabilities
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Option premiums received (paid), net
Changes In Option Premiums Collected Received
The net change during the reporting period in option premiums collected and paid. Options reflect the right or obligation to buy or sell an energy-related commodity and are classified in current and long-term mark-to-market derivative assets and liabilities.
Counterparty collateral posted, net
Increase Decrease In Counterparty Collateral Net
The net change during the reporting period in money or securities placed with a broker or counterparty as security for a trading or derivative position and the amount of customer money held in customer accounts, including security deposits, collateral for a current or future transactions, initial payment of the cost of acquisition or for the right to enter into a contract or agreement.
Income taxes
Increase (Decrease) in Income Taxes Payable
Pension and non-pension postretirement benefit contributions
Pension and Other Postretirement Benefit Contributions
Other assets and liabilities
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Net cash flows 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
Proceeds from nuclear decommissioning trust fund sales
Proceeds from Sale and Maturity of Other Investments
Investment in nuclear decommissioning trust funds
Payments to Acquire Other Investments
Acquisition of businesses
Payments to Acquire Businesses, Gross
Changes in intercompany money pool
Proceeds from Collection of (Payments to Fund) Long-term Loans to Related Parties
Proceeds from sale of long-lived assets
Proceeds from Sale of Property Held-for-sale
Proceeds from termination of direct financing lease investment
Proceeds From Lease Termination
Cash Proceeds from Direct Finance Lease Contract Termination
Proceeds from sale of investments
Proceeds from Sale, Maturity and Collection of Investments
Cash consolidated from CENG
Cash Acquired from Acquisition
Change in restricted cash
Increase (Decrease) in Restricted Cash
Other investing activities
Payments for (Proceeds from) Other Investing Activities
Changes in Exelon intercompany money pool
Change in Exelon intercompany money pool borrowings
Documentation to be provided
Net cash flows used in investing activities
Net Cash Provided by (Used in) Investing Activities
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payment of accounts receivable agreement
Repayments of Accounts Receivable Securitization
Changes in short-term borrowings
Proceeds from (Repayments of) Short-term Debt, Maturing in Three Months or Less
Issuance of long-term debt
Proceeds from Issuance of Long-term Debt
Retirement of long-term debt
Repayments of Long-term Debt
Redemption of preferred securities
Proceeds from (Repurchase of) Redeemable Preferred Stock
Distributions to noncontrolling interest of consolidated VIE
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Dividends paid on common stock
Payments of Ordinary Dividends, Common Stock
Proceeds from employee stock plans
Proceeds from Stock Plans
Other financing activities
Proceeds from (Payments for) Other Financing Activities
Payment of accounts receivable agreement
Repayments of Notes Payable
Distribution to member
Payments of Distributions to Affiliates
Contributions from parent
Proceeds from Contributions from Parent
Dividends paid on preferred securities
Payments of Ordinary Dividends, Preferred Stock and Preference Stock
Contribution from member
Proceeds from Contributions from Affiliates
Net cash flows provided by (used in) financing activities
Net Cash Provided by (Used in) Financing Activities
Increase in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Reconciliation of basic and diluted earnings per share
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block]
Cash Flow Hedge By Derivative Instrument [Axis]
Cash Flow Hedge By Derivative Instrument [Axis]
Presents the types of cash flow hedges.
Cash Flow Contract Type [Domain]
Cash Flow Contract Type [Domain]
Forms of cash flow hedges.
Energy Related Hedges [Member]
Energy Related Hedges [Member]
Energy related cash flow hedges.
Total Cash Flow Hedges [Member]
Total Cash Flow Hedges [Member]
Total cash flow hedges.
Cash Flow Hedges Gain Loss By Income Statement Location [Axis]
Cash Flow Hedges Gain Loss By Income Statement Location [Axis]
The income statement location that the gain/loss on cash flow hedges could be reported under.
Cash Flow Hedges Income Location [Domain]
Cash Flow Hedges Income Location [Domain]
The income statement line descriptions that the gain/loss on cash flow hedges could be reported under.
Operating Revenue One [Member]
Operating Revenue One [Member]
This element represents the gains (losses) included in earnings that are recognized in operating revenues.
Effect of Hedges on Accumulated Other Comprehensive Income [Roll Forward]
Effect of Hedges on Accumulated Other Comprehensive Income [Roll Forward]
Effect of Hedges on Accumulated Other Comprehensive Income [Roll Forward]
Accumulated OCI derivative gain - Beginning Balance
Cash Flow Hedge Accumulated Other Comprehensive Income Gain Loss
Balance of gain (loss) in AOCI related to cash flow hedging instruments.
Effective portion of changes in fair value
Effective portion of changes in fair value
Changes to accumulated comprehensive income resulting from gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk.
Reclassifications from accumulated OCI to net income
Accumulated OCI derivative gain - Ending Balance
Net gain (loss) related to ineffective portion of changes in fair value of treasury rate locks
Net gain (loss) related to ineffective portion of changes in fair value of treasury rate locks
Net gain (loss) related to ineffective portion of changes in fair value of treasury rate locks
Effective Portion Of Change In Fair Value Of Treasury Rate Lock Net Of Tax
Effective Portion Of Change In Fair Value Of Treasury Rate Lock Net Of Tax
The amount of net gains (losses) on a cash flow hedge reclassified in the period to earnings from accumulated other comprehensive income related to treasury rate locks, net of tax effect.
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax
Supplemental Income Statement Information [Table]
Schedule disclosing additional information about a registrants statement of operations.
Supplemental Income Statement Information [Line Items]
Supplemental Income Statement Information [Line Items]
Supplemental Income Statement Information Abstract
Other, Net [Abstract]
Other Nonoperating Income (Expense) [Abstract]
Decommissioning-Related Activities [Abstract]
Gain Loss On Nuclear Decommissioning Trust Fund Investments [Abstract]
Gain / loss on nuclear decommissioning trust fund investments abstract.
Net unrealized income (losses) on decommissioning trust funds - Regulatory Agreement Units
Unrealized Gain Loss Nuclear Decommissioning Trust Funds Regulatory Accounting
This item represents unrealized gains (losses) for the period as a result of holding marketable securities held in nuclear decommissioning trust funds and classified as trading securities. As a result of certain regulatory agreements for these nuclear decommissioning trust funds; upon completion of decommissioning activities, excess (shortfall of) funds will be refunded to (recovered from) rate payers through a regulated affiliate. Therefore, this activity is contractually eliminated within the income statement.
Net unrealized income (losses) on decommissioning trust funds - Non-Regulatory Agreement
Unrealized Gain Loss Nuclear Decommissioning Trust Funds Nonregulatory Accounting
This item represents unrealized gains (losses) included in earnings for the period as a result of holding marketable securities held in nuclear decommissioning trust funds and classified as trading securities.
Net unrealized income (losses) on pledged assets
Net Unrealized Gain Loss On Pledged Assets
Net unrealized losses on pledged assets associated with the decommissioning of a nuclear generating facility.
Regulatory offset to decommissioning trust fund-related activities
Regulatory Offset Nuclear Decommissioning Trust Fund Activity
This item represents the contractual elimination of nuclear decommissioning trust fund-related activity, which may include realized income (losses), unrealized income (losses), asset retirement obligation accretion, asset retirement cost amortization, investment income and related income taxes. As a result of certain regulatory agreements for these nuclear decommissioning trust funds; upon completion of decommissioning activities, excess (shortfall of) funds will be refunded to (recovered from) rate payers through a regulated affiliate. Therefore, this activity is contractually eliminated within the income statement.
Investment income
Investment Income, Interest
Long-term lease income
Capital Leases, Income Statement, Direct Financing Lease Revenue
Interest income related to uncertain income tax positions
Unrecognized Tax Benefits Interest Income
This element represents interest income recognized for an overpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.
AFUDC - equity
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity
Gain (Loss) on Disposition of Assets
Gain (Loss) on Disposition of Assets
Other Income
Other Nonoperating Income
Other, net
Supplemental Financial Information (Exelon, Generation, ComEd, PECO and BGE)
Supplemental Financial Information Disclosure [Text Block]
Element designated to encapsulate the entire footnote disclosure that provides information on the supplemental income statement, cash flow and balance sheet activities.
Restructuring and Related Activities [Abstract]
Schedule Of Corporate Restructuring Severance Benefit Obligation [Table]
Schedule Of Corporate Restructuring Severance Benefit Obligation [Table]
Restructuring Type [Axis]
Restructuring Type [Axis]
Type of Restructuring [Domain]
Type of Restructuring [Domain]
Employee Severance [Member]
Employee Severance [Member]
Other Severance Charges [Member]
Other Severance Charges [Member]
Other severance charges including but not limited to life insurance, employer payroll taxes, educational assistance and outplacement services
Corporate Restructuring Severance Benefit Obligation [Line Items]
Corporate Restructuring Severance Benefit Obligation [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.
Restructuring Reserve [Roll Forward]
Restructuring Reserve [Roll Forward]
Beginning Balance
Restructuring Reserve
Severance Charges Expense
Severance Charges Expense
Severance charge expense with O&M
Payments for Restructuring
Ending Balance
Summary of the derivative fair value
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
The activity of accumulated OCI related to cash flow hedges
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Other Derivatives - Gain (loss) and reclassification
Schedule Of Other Derivatives [Text Block]
This table provides details on contracts that do not qualify or are not designated for hedge accounting. These instruments represent economic hedges that mitigate exposure to fluctuations in commodity prices and include financial options, futures, swaps, and forward sales.
Information on Generation's credit exposure for all derivative instruments, normal purchase normal sales, and applicable payables and receivables, net of collateral and instruments that are subject to master netting agreements
Schedule Of Credit Risk [Text Block]
Table format of information on the sources of credit risk exposure faced by the entity for all derivative instruments and detail of credit exposure by type of counterparty
Classification Of Loss Exposure [Axis]
Classification Of Loss Exposure [Axis]
Loss Exposure [Domain]
Loss Exposure [Domain]
Investments [Member]
Investments [Member]
Contract Intangible Asset [Member]
Contract Intangible Asset [Member]
Asset Held In Trust Noncurrent [Member]
Asset Held In Trust Noncurrent [Member]
The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.
Commercial Agreement Variable Interest Entities [Member]
Commercial Agreement Variable Interest Entities [Member]
Total assets
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets
Total liabilities
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities
Exelon's ownership interest in VIE
Investments In Nonconsolidated Variable Interest Entities
This element represents the total investments in variable interest entities as of the balance sheet date.
Other ownership interests in VIE
Other Nonconsolidated Variable Interest Entity Ownership Interests
The carrying value of other ownership interests as of the balance sheet date.
Registrants' maximum exposure to loss
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount
Assets Held-in-trust, Noncurrent
Payable to Zion Solutions
Payable To Thirdparty To Decommission Nuclear Plant Funded By Pledged Assets
Total gross amount of liability as of the balance sheet date associated with the asset sale agreement and transfer of asset retirement obligation to ZionSolutions.
Earnings Per Share and Equity (Exelon)
Earnings Per Share [Text Block]
Common Stock [Abstract]
Common Stock [Abstract]
Common Stock (Exelon, Generation, ComEd, PECO and BGE)
Common Stock [Text Block]
Level 1 Text block concept for equity and debt transaction issued in connection with the PHI merger
Fair Value Assets Liabilities Measured On Recurring Basis [Table]
Summarization of information required and determined to be disclosed concerning assets and liabilities, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on a recurring basis.
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
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]
Fair Value Assets And Liabilities Measured On Recurring Basis Other Disclosure Items [Axis]
Fair Value Assets And Liabilities Measured On Recurring Basis Other Disclosure Items [Axis]
Provides the other information items required or determined to be disclosed with respect to assets and liabilities, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on a recurring basis.
Fair Value Assets And Liabilities Measured On Recurring Basis Other Disclosure Items [Domain]
Fair Value Assets And Liabilities Measured On Recurring Basis Other Disclosure Items [Domain]
Provides the other information items required or determined to be disclosed with respect to assets and liabilities, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on a recurring basis.
Nuclear Decommissioning Trust Fund Investments [Member]
Nuclear Decommissioning Trust Fund Investments [Member]
This element represents the assets measured at fair value on a recurring basis related to nuclear decommissioning trust fund investments.
Rabbi Trust Investments [Member]
Rabbi Trust Investments [Member]
This element represents the assets measured at fair value on a recurring basis related to rabbi trust investments.
Commodity Mark To Market Derivative Assets [Member]
Commodity Mark To Market Derivative Assets [Member]
Commodity Mark To Market Derivative Liabilities [Member]
Commodity Mark To Market Derivative Liabilities [Member]
Interest Rate Mark To Market Derivative Assets [Member]
Interest Rate Mark To Market Derivative Assets [Member]
Interest Rate Mark To Market Derivative Liabilities [Member]
Interest Rate Mark To Market Derivative Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items]
Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [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. 0
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Equity
Equity Securities [Abstract]
Individually held
Fair Value Assets Measured On Recurring Basis Equity Investments
This element represents equity investments measured at fair value on a recurring basis.
Exchange traded funds
Equity Method Investments, Fair Value Disclosure
Commingled funds
Fair Value Assets Measured On Recurring Basis Commingled Funds
This element represents comingled funds measured at fair value on a recurring basis.
Equity funds subtotal
Fair Value Assets Measured On Recurring Basis Equity Securities
This element represents equity securities measured at fair value on a recurring basis.
Balanced funds - commingled funds
Balanced Funds -Commingled Funds
Balanced Funds -Commingled Funds
Fixed income
Fair Value Assets Measured On Recurring Basis Fixed Income [Abstract]
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value
Debt securities issued by states of the United States and political subdivisions of the states
Financial Instruments, Owned, State and Municipal Government Obligations, at Fair Value
Debt securities issued by foreign governments
Financial Instruments, Owned, Other Sovereign Government Obligations, at Fair Value
Corporate debt securities
Financial Instruments, Owned, Corporate Debt, at Fair Value
Federal agency mortgage-backed securities
Fair Value Assets Measured On Recurring Basis Federal Agency Mortgage Backed Securities
This element represents Federal agency mortgage-backed securities measured at fair value on a recurring basis.
Commercial mortgage-backed securities (non-agency)
Fair Value Assets Measured On Recurring Basis Commercial Mortgage Backed Securities
This element represents commercial mortgage-backed securities measured at fair value on a recurring basis.
Residential mortgage-backed securities (non-agency)
Fair Value Assets Measured On Recurring Basis Residential Mortgage Backed Securities
This element represents residential mortgage-backed securities measured at fair value on a recurring basis.
Mutual funds
Mutual Funds Fixed Income Securities
Fair value of mutual funds reported under fixed income securities
Commingled funds
Commingled Funds Fixed Income Securities
fair value of comingled funds reported under fixed income securities
Fixed income subtotal
Fair Value Assets Measured On Recurring Basis Fixed Income Total
This element represents total assets related to fixed income investments measured at fair value on a recurring basis.
Middle market lending
Fair Value Assets Measured On Recurring Basis Direct Lending Securities
This element represents investments in managed funds which invest in private companies for long-term capital appreciation. The fair value of these securities is determined using either an enterprise value model or a bond valuation model.
Private Equity
Fair Value Assets Measured On Recurring Basis Private Equity
This element represents private equity investments measured at fair value on a recurring basis.
Other debt obligations
Fair Value Assets Measured On Recurring Basis Other Debt Obligations
This element represents the investment in other debt obligations measured at fair value on a recurring basis.
Fair Value Assets Measured On Recurring Basis Real Estate
Fair Value Assets Measured On Recurring Basis Real Estate
This element represents real estate investments measured at fair value on a recurring basis.
Nuclear decommissioning trust fund investments subtotal
Fair Value Assets Measured On Recurring Basis Nuclear Decommissioning Investments Total
This element represents total assets related to the nuclear decommissioning trust investments measured at fair value on a recurring basis.
Pledged assets for Zion Station decommissioning subtotal
Fair Value Assets Measured On Recurring Basis Pledged Assets Total
This element represents total assets related to the pledged assets for Zion Station decommissioning measured at fair value on a recurring basis.
Mutual funds
Fair Value Assets Measured On Recurring Basis Mutual Funds
This element represents mutual funds measured at fair value on a recurring basis.
Rabbi trust investments subtotal
Fair Value Assets Measured On Recurring Basis Rabbi Trust Investments Total
This element represents total assets related to Rabbi trust investments measured at fair value on a recurring basis.
Economic hedges
Fair Value On Recurring Basis Other Derivatives
This element represents other derivatives measured at fair value on a recurring basis.
Proprietary trading
Fair Value Measured On Recurring Basis Proprietary Trading
This element represents derivatives used for proprietary trading activities measured at fair value on a recurring basis.
Effect of netting and allocation of collateral
Fair Value On Recurring Basis Effect Of Collateral
This element represents Effect of netting and allocation collateral received/paid measured at fair value on a recurring basis.
Commodity derivative assets subtotal
Fair Value On Recurring Basis Mark To Market Total
This element represents the total balance of mark-to-market derivatives measured at fair value on a recurring basis.
Interest rate and foreign currency derivative assets
Fair Value On Recurring Basis Mark To Market Derivative
This element represents mark to market derivatives measured at fair value on a recurring basis.
Derivative Asset, Fair Value, Amount Not Offset Against Collateral
Derivative Asset, Fair Value, Amount Not Offset Against Collateral
Derivative Liability, Fair Value, Amount Not Offset Against Collateral
Derivative Liability, Fair Value, Amount Not Offset Against Collateral
Interest rate and foreign currency derivative assets subtotal
Interest Rate Mark To Market Subtotal
This element represents the subtotal of mark to market derivatives measured at fair value on a recurring basis.
Other investments
Investments, Fair Value Disclosure
Total assets
Fair Value Assets Measured On Recurring Basis Total
This element represents total assets measured at fair value on a recurring basis.
Deferred compensation obligation
Fair Value Liabilities Measured On Recurring Basis Deferred Compensation
This element represents deferred compensation liabilities measured at fair value on a recurring basis.
Total liabilities
Fair Value Liabilities Measured On Recurring Basis Total
This element represents total liabilities measured at fair value on a recurring basis.
Total net assets
Fair Value Asset And Liabilities Measured On Recurring Basis Total Net
This element represents total net assets (liabilities) measured at fair value on a recurring basis.
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Net assets (liabilities) excluded from nuclear decommissioning trust fund investments
Fair Value Net Assets Liabilities Excluded From Nuclear Decommissioning Trust Fund Investments
This element represents total net assets (liabilities) excluded from nuclear decommissioning trust fund investment total. The amount consists of payables related to pending securities purchases net of cash, interest receivables and receivables related to pending securities for the respective periods.
Deferred compensation
Supplemental executive retirement plan fair value
Supplemental Executive Retirement Plan Fair Value
Fair value of retirement plan investments recorded at fair value.
Cash surrender value of life insurance investments excluded from Rabbi Trust investments
Cash Surrender Value of Life Insurance
Collateral received from counterparties, net of collateral paid to counterparties
Derivative, Fair Value, Amount Offset Against Collateral, Net
Mark-to-market derivative liabilities
Commitments and Contingencies (Exelon, Generation, ComEd, PECO and BGE)
Commitments and Contingencies Disclosure [Text Block]
Investment in Constellation Energy Nuclear Group, LLC (Exelon and Generation)
Equity Method Investments and Joint Ventures Disclosure [Text Block]
Net income attributable to common shareholders
Potentially dilutive effect of stock options, performance share awards and restricted stock
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements
Average common shares outstanding — diluted
Capital Leases Net Investment In Direct Financing Leases [Table]
Capital Leases Net Investment In Direct Financing Leases [Table]
Capital Leases Net Investment In Direct Financing Leases [Line Items]
Capital Leases Net Investment In Direct Financing Leases [Line Items]
Capital Leases, Net Investment in Direct Financing Leases [Abstract]
Capital Leases, Net Investment in Direct Financing Leases [Abstract]
Carrying Amount Of Long Lived Assets To Be Written Down
Impaired Assets to be Disposed of by Method Other than Sale, Carrying Value of Asset
Impaired Assets Fair Value
ImpairedAssetsFairValue
ImpairedAssetsFairValue
Tangible Asset Impairment Charges
Tangible Asset Impairment Charges
Utilities Operating Expense, Impairments
Utilities Operating Expense, Impairments
Interest Costs Incurred
Interest Costs Incurred
Capital Lease Net Investment In Direct Financing Leases Prepayments Received
Capital Lease Net Investment In Direct Financing Leases Prepayments Received
Capital Lease Net Investment in Direct Financing Leases Prepayments Received
Proceeds From Lease Termination
Capital Leases Net Investment In Direct Financing Leases Writeoff
Capital Leases Net Investment In Direct Financing Leases Writeoff
Capital Leases Net Investment In Direct Financing Leases Writeoff
Impairment of Long-Lived Assets to be Disposed of
Impairment of Long-Lived Assets to be Disposed of
Supplemental Financial Information [Table]
Supplemental Financial Information [Table]
Internal Credit Assessment [Axis]
Internal Credit Assessment [Axis]
Internal Credit Assessment [Domain]
Internal Credit Assessment [Domain]
Low To Medium Risk [Member]
Low To Medium Risk [Member]
Represents valuation allowance for financing receivables that are expected to be uncollectible for customers deemed low to medium risk based on internal risk segmentation.
Risk Level, Medium [Member]
Risk Level, Medium [Member]
Risk Level, High [Member]
Risk Level, High [Member]
Supplemental Financial Information Tables [Line Items]
Supplemental Financial Information Tables [Line Items]
Supplemental Financial Information.
Smart Grid Grant Project Capital Expenditures
Smart Grid Grant Project Capital Expenditures
Represents the reimbursable smart grid investment grant project expenditures included in capital expenditures.
Smart Grid Grant Reimbursements
Smart Grid Grant Reimbursements
DOE Smart Grid Investment Grant Reimbursement
Financing Receivable, Net
Financing Receivable, Net
Financing Receivable, Allowance for Credit Losses
Financing Receivable, Allowance for Credit Losses
Schedule of Variable Interest Entities
Schedule of Variable Interest Entities [Table Text Block]
Asset Retirement Obligation Roll Forward Analysis [Table]
Asset Retirement Obligation Roll Forward Analysis [Table]
A table for the reconciliation of the nuclear decommissioning asset retirement obligation from the beginning of a period to the end of a period.
Asset Retirement Obligation Type [Axis]
Asset Retirement Obligation Type [Axis]
Asset Retirement Obligation Type [Domain]
Asset Retirement Obligation Type [Domain]
Nuclear Decommissioning Asset Retirement Obligation [Member]
Nuclear Decommissioning Asset Retirement Obligation [Member]
Asset Retirement Obligation Roll Forward Analysis [Line Items]
Asset Retirement Obligation Roll Forward Analysis [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.
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Nuclear Decommissioning ARO, Beginning Balance
Asset Retirement Obligation
Accretion expense
Asset Retirement Obligation Accretion Expense Impact
Amount of nuclear accretion expense recognized in the income statement during the period that is associated with nuclear asset retirement obligations. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. Such accretion expense representing changes in the liability for a nuclear asset retirement obligation due to passage of time is the result of applying an interest method of allocation to the amount of the liability at the beginning of the period. The interest rate used to measure that change shall be the credit-adjusted risk-free rate that existed when the liability, or portion thereof, was initially measured. That amount shall be recognized as an increase in the carrying amount of the liability and as an expense classified as an operating item in the statement of income. Accretion expense shall not be considered to be interest cost for purposes of capitalization of interest.
Costs incurred to decommission retired plants
Asset Retirement Obligation, Liabilities Settled
Nuclear Decommissioning ARO, Ending Balance
Current portion of ARO
Asset Retirement Obligation, Current
Aggregate fair value of derivatives with credit-risk-related contingent features
Derivative Liability, Fair Value, Gross Liability
Contractual right of offset related to derivative assets
Derivative Liability, Fair Value, Amount Offset Against Collateral
Net liability position after contractual right of offset
Net Asset Liability Position After Contractual Right Of Offset
The net asset or liability position as of the balance sheet date after applying the contractual right of offset related to derivative instruments with credit-risk-related contingent features with the same counterparty under master netting agreements. Credit-risk-related contingent features stipulate that if the Company were to be downgraded or lose its investment grade credit rating (based on its senior unsecured debt rating), it would be required to provide additional collateral.
EDFI [Member]
EDFI [Member]
EdfiMember
Electricite De France LLC [Member]
Electricite De France LLC [Member]
Electricite De France SA LLC
Constellation Energy Group LLC [Member]
Constellation Energy Group LLC [Member]
Constellation Energy Group LLC
Interest rate on loan to CENG
Interest rate on loan to CENG
Payments of Distributions to Affiliates
Reduction To Net Income Attributable To Noncontrolling Interest
ReductionToNetIncomeAttributableToNonControllingInterest
ReductionToNetIncomeAttributableToNonControllingInterest
Interest Rate On Distribution
InterestRateOnDistribution
Interest Rate On Distribution from CENG to Generation
Total equity investment earnings (losses) - CENG
Income Loss From Equity Method Investment In Affiliate
This item represents the entity's proportionate share for the period of the net income (loss) of its affiliate to which the equity method of accounting is applied.
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement
AllocationOfFederalTaxBenefitUnderTaxSharingAgreement
Federal income tax benefits allocated by a parent entity to its subsidiaries under a mutually agreed-upon tax sharing agreement, for which the goal is that the subsidiaries are responsible for the same amount of income tax expense or benefits that they would owe or receive had the subsidiary been separately subject to tax. Allocations of income tax benefits are treated as contributions of capital to the subsidiaries.
Other Comprehensive Income (Loss), Tax
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value
Business Acquisition, Preexisting Relationship, Gain (Loss) Recognized
Business Acquisition, Preexisting Relationship, Gain (Loss) Recognized
Net Income (Loss) Attributable to Parent
Net Income (Loss) Attributable to Parent
Business Combination, Integration Related Costs
Business Combination, Integration Related Costs
Severance charges recorded
Severance Obligation Severance Charges
Amount charged against earnings in the period for a specified incurred and estimated severance cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.
Commitments And Contingencies Additional Narrative Information [Table]
Commitments And Contingencies Additional Narrative Information [Table]
Commitments And Contingencies Additional Narrative Information [Table]
Nuclear Insurance Premiums [Member]
Nuclear Insurance Premiums [Member]
Retrospective nuclear insurance premiums related to ANI under the Price-Anderson Act and participation in NEIL
Sithe Guarantee [Member]
Sithe Guarantee [Member]
Guarantee related to Sithe.
Commitments And Contingencies Additional Narrative Information [Line Items]
Commitments And Contingencies Additional Narrative Information [Line Items]
Commitments And Contingencies Additional Narrative Information [Line Items]
Nuclear insurance liability limit per incident
Nuclear Insurance Annual Coverage Limit
Annual coverage limit provided by the nuclear insurance arrangement for nuclear incident claims.
Required nuclear liability insurance per site
Nuclear Insurance Required Per Site
Insurance required by the nuclear insurance arrangement for each operating nuclear site of a company.
Total of U.S. licensed nuclear reactors
United States Licensed Nuclear Reactors Total
The current total number of currently licensed nuclear reactors in the United States.
Nuclear financial protection pool value
Nuclear Insurance Financial Protection Pool Value
Total funds available for nuclear insurance liability claims in a financial protection pool mandated by the Price-Anderson Act.
Nuclear Insurance Financial Protection Pool Surcharge On Nuclear Incident Assessment
Nuclear Insurance Financial Protection Pool Surcharge On Nuclear Incident Assessment
Surcharge to the maximum assessment to be paid per nuclear reactor for nuclear incidents, under the financial protection pool mandated by the Price-Anderson Act. This legal surcharge may be applied, if needed, to legal costs associated with the nuclear incident.
Maximum assessment mandated by Price-Anderson Act per nuclear reactor for a nuclear incident
Nuclear Insurance Financial Protection Pool Maximum Assessment
Maximum assessment to be paid per nuclear reactor for a nuclear incident, under the financial protection pool mandated by the Price-Anderson Act. This assessment is paid by each United States nuclear reactor operator over multiple years at a limited amount per year in the event of an incident at any United States nuclear reactor.
Maximum liability per nuclear incident
Nuclear Insurance Financial Protection Pool Nuclear Operator Maximum Total Assessment
Maximum total assessment to be paid by a nuclear operator for a nuclear incident, under the financial protection pool mandated by the Price-Anderson Act. The total amount is calculated by multiplying the total nuclear reactors operated, by the maximum assessment per nuclear reactor.
Cost of spent nuclear fuel disposal per kWh of net nuclear generation
Cost Of Spent Nuclear Fuel Disposal
Costs per kWh of net nuclear generation required to be paid to the Department of Energy per contracts under the Nuclear Waste Policy Act of 1982. Cost can be adjusted prospectively in order to ensure full cost recovery.
Net Nuclear Fuel Disposal Fees
NetNuclearFuelDisposalFees
Spent Nuclear Fuel Disposal Fees including Exelon's share of Salem and net of co-owner reimbusements
Acquisition of interest in subsidiary
Business Acquisition, Percentage of Voting Interests Acquired
Sale of interest in subsidiary
Business Divestiture Interest Divested
The level of ownership or equity interest in a business divested in a business divestiture.
Schedule of Guarantor Obligations [Table]
Schedule of Guarantor Obligations [Table]
Subsidiary Companies [Axis]
Subsidiary Companies [Axis]
Subsidiary Companies [Domain]
Subsidiary Companies [Domain]
Commonwealth Edison III [Member]
Commonwealth Edison Three [Member]
Commonwealth Edison Three [Member]
PECO Trust III and IV [Member]
PECO Trust Three and Four [Member]
PECO Trust Three and Four [Member]
Baltimore Gas and Electric Capital Trust II [Member]
Baltimore Gas and Electric Capital Trust Two [Member]
Baltimore Gas and Electric Capital Trust Two [Member]
Financial Standby Letter of Credit [Member]
Financial Standby Letter of Credit [Member]
Guarantees Other Than Letters Of Credit and Nuclear Insurance Premiums [Member]
Guarantees Other Than Letters Of Credit and Nuclear Insurance Premiums [Member]
Guarantees other than letters of credit and nuclear insurance, including parental guarantees on behalf of subsidiaries and guarantees on surety bonds, performance contracts, energy marketing contracts, trust preferred securities, leases and indemnifications.
Trust Preferred Securities [Member]
Trust Preferred Securities [Member]
Preferred securities of a financing trust
Guarantor Obligations [Line Items]
Guarantor Obligations [Line Items]
Underwriting Discount
UnderwritingDiscount
Underwriting Discount
Estimated net exposure for commercial transaction obligations
Estimated Net Exposure For Obligations Under Commercial Transactions
Guarantees of certain subsidiary obligations to third parties in order to allow subsidiaries the flexibility needed to conduct business with counterparties without having to post other forms of collateral.
Percentage owned finance subsidiary
Consolidated Subsidiary Common Stock Ownership Percentage
The percentage of ownership of common stock or equity participation in the consolidated subsidiary.
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Long Term Debt Interest Rate Type [Axis]
Long Term Debt Interest Rate Type [Axis]
Long term debt type of interest rate axis.
Long Term Debt Interest Rate Type [Domain]
Long Term Debt Interest Rate Type [Domain]
Types of interest rates on debt.
Floating Rate Debt [Member]
Floating Rate Debt [Member]
Bonds whose interest rate varies based on the terms of the debt agreements.
Long Term Debt [Axis]
Long Term Debt [Axis]
Long-term debt issuances and retirements axis
Long Term Debt [Domain]
Long Term Debt [Domain]
Long-term debt issuances and retirements domain.
Long Term Debt Issuances [Member]
Long Term Debt Issuances [Member]
Issuances of long-term debt during the period
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
DOE Financing Project [Member]
DOE Financing Project [Member]
Convertible Debt Securities [Member]
Convertible Debt Securities [Member]
Unsecured Debt [Member]
Unsecured Debt [Member]
First Mortgage Bonds [Member]
First Mortgage Bonds [Member]
Bonds that are backed by the first claim on the proceeds from the sale of a specific asset or set of assets in the event that the company is liquidated.
Senior Notes [Member]
Senior Notes [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
UpstreamGasLending221July222016[Member]
UpstreamGasLending221July222016[Member]
Long Term Debt issued Up stream Gas Lending 2.21percent July 22,2016
NuclearFuelPurchaseContract3350june302018 [Member]
NuclearFuelPurchaseContract3350june302018 [Member]
Long term debt used for the procurement of Uranium
ExgenRenewablesI425June62021[Member]
ExgenRenewablesI425June62021[Member]
Long Termm Debt Issued ExgenRenewablesI 4.25% due June 6 2021
Energy Efficiency Project Financing [Member]
Energy Efficiency Project Financing [Member]
Documentation to be provided
AVSR [Member]
AVSR [Member]
AVSR [Member]
NuclearFuelPurchaseContract3250june302018Member [Member]
NuclearFuelPurchaseContract3250june302018Member [Member]
NuclearFuelPurchaseContract3250june302018Member [Member]
FirstMortgageBondSeries115January152019 [Member]
FirstMortgageBondSeries115January152019 [Member]
FirstMortgageBondSeries115January152019 [Member]
FirstMortgageBondSeries116January152044 [Member]
FirstMortgageBondSeries116January152044 [Member]
FirstMortgageBondSeries116January152044 [Member]
FirstAndRefundingMortageBondsOctoberu12044 [Member]
FirstAndRefundingMortageBondsOctoberu12044 [Member]
FirstAndRefundingMortageBondsOctoberu12044 [Member]
DOE Project Financing, 3.092% January 2, 2037 [Member]
DOE Project Financing, 3.092% January 2, 2037 [Member]
CEU Credit Agreement [Member]
CEU Credit Agreement [Member]
Continental Wind 6000 February 28, 2033 [Member]
Continental Wind 6000 February 28, 2033 [Member]
FirstMortgageBondSeries114August152043 [Member] [Member]
FirstMortgageBondSeries114August152043 [Member] [Member]
FirstMortgageBondSeries114August152043 [Member] [Member]
FirstAndRefundMortgageBondOctober152016 [Member]
FirstAndRefundMortgageBondOctober152016 [Member]
FirstAndRefundMortgageBondOctober152016 [Member]
FirstAndRefundMortgageBondOctober152043 [Member]
FirstAndRefundMortgageBondOctober152043 [Member]
FirstAndRefundMortgageBondOctober152043 [Member]
SeniorNotesJuly12023Member [Member]
SeniorNotesJuly12023Member [Member]
SeniorNotesJuly12023[Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Interest Rate
Debt Instrument, Interest Rate, Stated Percentage
Long-term Debt
Long-term Debt
Long-term Debt, Excluding Current Maturities
Subordinated Debt, Amount
Subordinated Long-term Debt, Noncurrent
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Domain]
Short-term Debt, Type [Domain]
Bridge Loan [Member]
Bridge Loan [Member]
Junior Subordinated Debt [Member]
Junior Subordinated Debt [Member]
Business Acquisition [Axis]
Business Acquisition [Axis]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Pepco Holdings [Member]
Pepco Holdings [Member]
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Payments to Acquire Businesses and Interest in Affiliates [Abstract]
Payments to Acquire Businesses and Interest in Affiliates [Abstract]
Payments to Acquire Businesses, Gross
Other Payments to Acquire Businesses
Other Payments to Acquire Businesses
Business Combination Proposed Customer Benefits Package
Business Combination Proposed Customer Benefits Package
Exelon and PHI have proposed a package of benefits to PHI utilities customers which results in a direct investment of more than $100 million
Business Exit Costs
Business Exit Costs
Cash Funding From Non Core Asset Sale
CashFundingFromNonCoreAssetSale
Additioanal cash to be used in funding the Pepco Holdings Inc, merger by selling non-core asset
Expected Debt Issuance
Expected Debt Issuance
Expected Debt Issuance to fund PHI acquisition
Equity Security units
EquitySecurityunits
Equity Security Units
Line of Credit Facility, Maximum Borrowing Capacity
Line of Credit Facility, Maximum Borrowing Capacity
Bridge Loan
Bridge Loan
Gain on Sale of Investments
Gain on Sale of Investments
Equity Method Investment, Net Sales Proceeds
Equity Method Investment, Net Sales Proceeds
Cash offered in exchange for each share of PHI stock
Business Acquisition, Share Price
Payments to Acquire Assets, Investing Activities
Payments to Acquire Assets, Investing Activities
Other Long-term Investments
Other Long-term Investments
Other Long Term Investments Maximum
OtherLongTermInvestmentsMaximum
Other noncurrent assets
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds
Expected Pre-Tax proceeds
Expected Pre-Tax proceeds
Expected Pre-Tax proceeds from Power Plant Assets Divestitures
Assets Held-for-sale, at Carrying Value
Assets Held-for-sale, at Carrying Value
Fair Value Inputs, Assets, Quantitative Information [Table]
Geographical [Axis]
Geographical [Axis]
Geographical [Domain]
Geographical [Domain]
All Regions excluding New England [Member]
All Regions excluding New England [Member]
All Regions excluding New England [Member]
Valuation Technique [Axis]
Valuation Technique [Axis]
Valuation Technique [Domain]
Valuation Technique [Domain]
Discounted Cash Flow [Member]
Income Approach Valuation Technique [Member]
Option Model Valuation Technique [Member]
Option Model Valuation Technique [Member]
Option model approach valuation technique used to measure fair value.
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Fair Value Inputs [Abstract]
Fair Value Inputs [Abstract]
Forward power price assets
Fair Value Inputs Forward Power Price Assets
This element represents the forward power market price used to calculate the change in fair value of the derivative instrument.
Forward gas price assets
Fair Value Inputs Forward Gas Price Assets
This element represents the forward power market price used to calculate the change in fair value of the derivative instrument.
Volatility percentage
Fair Value Assumptions, Expected Volatility Rate
Marketability Reserve
Fair Value Inputs, Discount for Lack of Marketability
Forward heat rate
Fair Value Inputs Forward Heat Rate
This element represents the factor that is multiplied with the forward price of natural gas to calculate a forward power curve. Natural gas has greater liquidity tenor than power and is commonly used to calculate this curve.
Renewable factor
Fair Value Inputs Renewable Factor
This element represents a factor to adjust an around the clock forward power price and quantity to be in line with an applicable renewable facility. Solar units generally produce more power in the summer days and wind units generally produce more power in the spring and fall evenings.
Cash collateral excluded
Fair Value Inputs Cash Collateral Excluded
This element represents the Level 3 cash collateral value excluded from the significant inputs to the forward curve used to value swap contracts
Unrealized Losses On Nuclear Decommissioning Trust Fund Investment [Table]
Unrealized Losses On Nuclear Decommissioning Trust Fund Investment [Table]
A table providing unrealized gains/losses on nuclear decommissioning trust funds and other-than-temporary impairment of nuclear decommissioning trust funds.
Unrealized Losses On Nuclear Decommissioning Trust Fund Investment [Line Items]
Unrealized Losses On Nuclear Decommissioning Trust Fund Investment [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.
Unrealized Gain Loss Investment Income Pledged Assets
Unrealized Gain Loss Investment Income Pledged Assets
Unrealized Gain Loss Investment Income on Zion Station Pledged Assets
Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings [Table]
Schedule that discloses total realized and unrealized gains/losses included in income for assets and liabilities with unobservable inputs measured on a recurring basis.
Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement Location [Domain]
Income Statement Location [Domain]
Purchased Fuel and Electric [Member]
Purchased Fuel and Electric [Member]
This element represents the gains (losses) included in earnings that recognized in purchased fuel and electric expense.
Other, net [Member]
Other, net [Member]
This element represents the gains (losses) included in earnings that recognized in Other, net.
Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings [Line Items]
Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings [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.
Total gains (losses) included in income
Fair Value Assets Measured On Recurring Basis Gain Loss Included In Net Income
This item represents the total amount of the realized and unrealized gains or losses for the period which are included in net income for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
Change in the unrealized gains (losses) relating to assets and liabilities held
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Earnings Attributed To Changes In Unrealized Gains Losses
This element represents total unrealized gains or losses for the period, arising from the change in fair value related to assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), held as of the balance sheet date.
Document and Entity Information [Abstract]
Document and Entity Information.
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Document Type
Document Type
Document Period End Date
Document Period End Date
Amendment Flag
Amendment Flag
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Voluntary Filers
Entity Current Reporting Status
Entity Current Reporting Status
Entity Filer Category
Entity Filer Category
Entity Common Stock Shares Outstanding
Entity Common Stock, Shares Outstanding
Public Utilities, Inventory, Fuel [Member]
Public Utilities, Inventory, Fuel [Member]
Variable Interest Entities (Exelon, Generation, ComEd, PECO and BGE)
Variable Interest Entities Disclosure [Text Block]
Investment [Axis]
Investment [Axis]
Investment [Domain]
Investment [Domain]
Equity Method Investments [Member]
Other Unrecorded Amounts
Other Unrecorded Amounts
Fair Value Tables [Line Items]
Fair Value Tables [Line Items]
Fair value of financial liabilities recorded at the carrying amount
Fair Value, by Balance Sheet Grouping [Table Text Block]
Assets and liabilities measured and recorded at fair value on recurring basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block]
This element represents, for the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs).
Total realized and unrealized gains (losses) included in income for Level 3 assets and liabilities measured at fair value on a recurring basis
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block]
Fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis, valuation technique
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]
Supplemental Cash Flow Information [Table]
Schedule disclosing additional information about a registrants statement of cash flows
Loss Contingency Nature [Axis]
Loss Contingency Nature [Axis]
Loss Contingency, Nature [Domain]
Loss Contingency, Nature [Domain]
Indemnification Agreement [Member]
Indemnification Agreement [Member]
Supplemental Cash Flow Information [Line Items]
Supplemental Cash Flow Information [Line Items]
Supplemental Cash Flow Information [Line Items]
Depreciation, Amortization and Accretion [Abstract]
Depreciation, Amortization and Accretion, Net [Abstract]
Property, plant and equipment
Depreciation
Regulatory assets
Amortization of Regulatory Asset
Amortization of intangible assets, net
Amortization of Intangible Assets Net
The net expense charged against earnings to allocate the cost of intangible assets and liabilities(nonphysical assets and liabilities not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.
Amortization of energy contract assets and liabilities
Energy Contract Amortization
The amount of capitalized power supply and fuel accrual-based contract costs, that were acquired from Constellation, and were charged to purchased power and fuel expense during the period.
Nuclear fuel
Nuclear Fuel Amortization
The amount of capitalized nuclear fuel costs that are charged to fuel expense during the period using the unit-of-production method.
Asset retirement obligation accretion
Asset Retirement Obligation, Accretion Expense
Total depreciation, amortization and accretion
Other Non-Cash Operating Activities [Abstract]
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Pension and non-pension postretirement benefits costs
Pension and Other Postretirement Benefit Expense
Gain (loss) on equity method investments
Provision for uncollectible accounts
Provision for Doubtful Accounts
Stock-based compensation costs
Share-based Compensation
Other Decommissioning Related Activity
Other Decommissioning Related Activity
This item represents realized and unrealized gains (losses) for the period as a result of selling and holding marketable securities in nuclear decommissioning trust funds. Additionally, this item includes the elimination of operating revenues, asset retirement obligation accretion, asset retirement cost amortization, investment income and income taxes related to nuclear decommissioning trust fund activity. As a result of certain regulatory agreements for these nuclear decommissioning trust funds; upon completion of decommissioning activities, excess (shortfall of) funds will be refunded to (recovered from) rate payers through a regulated affiliate. Therefore, this activity is contractually eliminated within the income statement.
Energy-related options
Energy Related Options
Represents the reclassification of energy-related option premiums to realized at settlement of contracts recorded in results of operations due to the settlement of the underlying transaction.
Amortization of regulatory asset related to debt costs
Amortization Of Regulatory Asset Debt Costs
The expense charged against earnings during the period as a result of amortizing the losses on reacquired debt, which were capitalized as regulatory assets, over the life of the new debt issued to refinance the debt redemption or over the original life of the debt redeemed.
Amortization of rate stabilization deferral
Amortization Rate Stabilization Deferral
Amortization of deferred costs under BGE rate stabilization
Amortization of debt fair value adjustment
Amortization Of Debt Fair Value Adjustment
Amortization of debt fair value as part of purchase accounting related to the merger.
Discrete impacts from EIMA
Impacts Energy Infrastructure Modernization Act
Non cash impact recorded to the income statement pursuant to an order and/or ruling by state regulators and/or courts.
Amortization of debt costs
Amortization Of Debt Costs
This represents the amortization of unamortized debt expenses
Merger related commitments
Noncash Merger Related Costs
Inventory Write-down
Inventory Write-down
Other
Other Noncash Income Expense Net
Other income and expenses included in net income that result in no cash inflows or outflows in the period, but increase or decrease net income and thus are removed when calculating net cash flow from operating activities using the indirect method. This element is used when there is not a more specific and appropriate element.
Total other noncash operating activities
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities
Changes In Other Assets and Liabilities [Abstract]
Increase Decrease In Other Operating Capital Net [Abstract]
Under/over-recovered energy and transmission costs
Increase (Decrease) in over (under) Energy Recovery
Other regulatory assets and liabilities
Increase (Decrease) Other Regulatory Assets and Liabilities
Cash flow impacts of other operating activities related to regulatory assets and liabilities
Increase (Decrease) in Deposits
Increase (Decrease) in Deposits
Increase (Decrease) in Other Current Liabilities
Increase (Decrease) in Other Current Liabilities
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net
Increase (Decrease) in Other Noncurrent Liabilities
Increase (Decrease) in Other Noncurrent Liabilities
Other current assets and liabilities
Increase (Decrease) In Other Current Operating Assets And Liabilities
The (increase) decrease during the reporting period in other current assets provided by or used in operating activities not otherwise defined in the taxonomy.
Other noncurrent assets and liabilities
Increase (Decrease) In Other Noncurrent Operating Assets Liabilities
The net change during the reporting period in other non-current assets and liabilities provided by or used in operating activities not otherwise defined in the taxonomy. A positive value indicates a decrease in the net other non-current assets or an increase in the net other non-current liabilities, while a negative value indicates an increase in the net other non-current assets or a decrease in the net other non-current liabilities.
Total changes in other assets and liabilities
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Non cash Fair Value Adjustment for CENG
NonCashFairValueAdjustment
NonCashFairValueAdjustment
Debt exchange
Debt Conversion, Original Debt, Amount
Non Cash Debt Instrument Issued
NonCashDebtInstrumentIssued
NonCashDebtInstrumentIssued
Indemnification of like-kind exchange position
Consolidated VIE dividend to non-controlling interest
Total noncash investing and financing activities
Noncash Investing And Financing Activities Total
Total noncash investing and financing activities disclosed in supplemental financial information
Regulatory Matters Additional Narrative Information [Table]
Regulatory Matters Additional Narrative Information [Table]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent Event [Member]
Subsequent Event [Member]
Regulatory Agency [Axis]
Regulatory Agency [Axis]
Regulatory Agency [Domain]
Regulatory Agency [Domain]
FERC Transmission Complaint [Member]
FERC Transmission Complaint [Member]
FERC Transmission Complaint [Member]
Regulatory Asset [Axis]
Regulatory Asset [Axis]
Regulatory Asset [Domain]
Regulatory Asset [Domain]
Under Recovered Distribution Service Costs [Member]
Under Recovered Distribution Service Costs [Member]
Represents the under-recovered (regulatory asset) distribution service costs recoverable from customers. An under recovery means that the actual costs of distributing electricity realized by the regulated utility were more than the rates charged to customers during the period and are recoverable from customers.
AMI Expenses [Member]
AMI Expenses [Member]
Represents costs incurred related to the state utility commission approved advanced metering infrastructure program.
Energy Efficiency And Demand Response Programs [Member]
Energy Efficiency And Demand Response Programs [Member]
Costs related to energy efficiency and demand response programs recorded to a regulatory asset
Transmission Rate Formula [Member]
Transmission Rate Formula [Member]
Transmission Rate Formula [Member]
Regulatory Asset Liability [Axis]
Regulatory Asset Liability [Axis]
Presents the name of the regulatory assets and liabilities itemized in a table of regulatory current or noncurrent assets and liabilities.
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Matters Additional Narrative Information [Line Items]
Rate of Return on Common Equity, Incentive Basis Points
Rate of Return on Common Equity, Incentive Basis Points
Rate of Return on Common Equity, Incentive Basis Points
Net regulatory asset
Net Regulatory Asset
Net under recoveries of costs to be reimbursed by customers resulting in a regulatory asset.
Public Utilities, Requested Rate Increase (Decrease), Amount
Public Utilities, Requested Rate Increase (Decrease), Amount
Expected revenue adjustment for current year
Current Year Revenue Adjustment
Exepected adjustment to revenue related to the current year.
Expected revenue adjustment for prior year
Prior Year Revenue Adjustment
Exepected adjustment to revenue to be recorded in the prior year.
Requested Debt and Equity Return on Distribution
Public Utilities, Requested Equity Capital Structure, Percentage
Requested ROE
Public Utilities, Requested Return on Equity, Percentage
Weighted Average Debt And Equity Return Electric Distribution
Weighted Average Debt And Equity Return Electric Distribution
The weighted average debt and equity return on electric distribution rate base that a utility is authorized to recover through regulated rates for a specific period.
Weighted Average Debt And Equity Return
Weighted Average Debt And Equity Return
The weighted average debt and equity return on transmission rate base that a utility is authorized to recover through regulated rates for a specific period.
Public Utilities, Interim Rate Increase (Decrease), Amount
Public Utilities, Interim Rate Increase (Decrease), Amount
Approved Debt and Equity Rate on Distribution
Public Utilities, Approved Equity Capital Structure, Percentage
Approved ROE
Public Utilities, Approved Return on Equity, Percentage
ICC Approved Rate Increase (Decrease), Amount
Public Utilities, Approved Rate Increase (Decrease), Amount
Demand response peak demand reduction
Annual Demand Response Reduction
Required reduction in peak energy demand under State program.
Requested increase in electric revenues
Electric Revenues Increase Requested
Electric delivery service revenue increase requested by a utility through a rate case proceeding with state regulators, which is pending approval.
Adjustment to Requested increase in electric revenues
Adjustment To Electric Revenues Increase Requested
Estimated adjustment to electric delivery service revenue requirement increase requested by a utility through a rate case proceeding with state regulators.
Requested increase in gas revenues
Gas Revenues Increase Requested
Gas delivery service revenue increase requested by a utility through a rate case proceeding with state regulators, which is pending approval.
Rate of return on common equity electric distribution
Rate Of Return Common Equity Electric Distribution
Rate of return on common equity electric distribution
Rate of return on common equity gas distribution
Rate Of Return Common Equity Gas Distribution
Rate of return on common equity gas distribution
Increase in electric delivery service revenue resulting from rate case settlement or order.
Electric Revenues Increase Settlement
Utility electric delivery service revenue increase resulting from a rate case settlement with interested parties, which is subject to state utility commission approval or order.
Increase in gas delivery service revenue resulting from rate case settlement or order.
Gas Revenues Increase Settlement
Utility gas delivery service revenue increase resulting from a rate case settlement with interested parties, which is subject to state utility commission approval or order.
Annual Depreciation Expense Decrease Regulated Property
Annual Depreciation Expense Decrease Regulated Property
Annual Depreciation Expense Decrease Regulated Property
Requested Rate Of Return Common Equity Electric Distribution
Requested Rate Of Return Common Equity Electric Distribution
Requested Rate Of Return Common Equity Gas Distribution
Requested Rate Of Return Common Equity Gas Distribution
Gross transmission revenue requirement
Gross transmission revenue requirement
The total transmission revenue requirement for a specific period that a utility is authorized to recover through regulated rates, which includes operating expenses and a return on rate base.
Transmission revenue true up
Transmission revenue true up
Adjustment made to a utility's transmission revenue requirement for a specific period as a result of a true-up of actual costs for the specific period.
Net transmission revenue requirement
Net transmission revenue requirement
The total transmission revenue requirement for a specific period net of a true-up of actual costs incurred from the prior year, which includes operating expenses and a return on rate base.
Net Regulatory Asset
Regulatory Rate of Return Approved
Public Utilities, Approved Rate Increase (Decrease), Percentage
Public Utilities, Interim Rate Increase (Decrease), Percentage
Public Utilities, Interim Rate Increase (Decrease), Percentage
Public Utilities, Requested Rate Increase (Decrease), Percentage
Public Utilities, Requested Rate Increase (Decrease), Percentage
Revenue Reduction
Revenue Reduction
Revenue Reduction
Customer Refund Liability, Noncurrent
Customer Refund Liability, Noncurrent
Estimated number of smart meters to be installed
Estimated Smart Meters
Estimated number of smart meters to be installed to comply with state law, which requires for utility to install smart meters for all customers.
Smart Meters Installed
Smart Meters Installed
The number of smart meters installed under a pilot program approved by a state utility regulator.
Revised spend on its Smart Meter Procurement and Installation Plan
Projected Investment In Smartmeters
Projected Investment In Smartmeters
Spend on smart grid investments
Projected Investment In Smart Grid Infrastructure
Projected Investment In Smart Grid Infrastructure
Smart meter spend to date
Total Smartmeter Spend On Investment
Total Smartmeter Spend On Investment
Smart grid infrastructure spend to date
Total Smart Grid Spend On Investment
Total Smart Grid Spend On Investment
Total smart grid and smart meter investment grant amount
Total Smart Grid Smart Meter Investment Grant Awarded
Grant that was awarded to the utility under a smart grid program by the Department of Energy.
Smart meter investment grant awarded
Smart Meter Investment Grant Awarded
Grant that was awarded to the utility under a smart grid program for smart meters with the Department of Energy.
Smart grid investment grant awarded
Smart Grid Investment Grant Awarded
Grant that was awarded to the utility for smart grid investments from the Department of Energy.
Reimbursements received from the DOE
Doe Reimbursements
Reimbursements received from the DOE related to the SGIG.
Regulatory assets for original smart meters purchased
Regulatory Assets For Original Smart Meters Purchased
Regulatory asset established for the amount of the original meters, net of accumulated depreciation and DOE reimbursements
Vendor Refund
VendorRefund
Amount of reimbursements received from the DOE applied to the originally installed Smart Meters.
Doe Reimbursements Use For Original Meter Installment
Amount of reimbursements received from the DOE related to the SGIG that were applied by the Utility towards the Smart Meters it originally installed.
Total Projected smart meter smart grid spend
Total Project Smart Meter Smart Grid Spend
Projected total spend on PECO's smart grid and smart meter infrastructure
Current Year AMI Events Balance
Current Year AMI Events Balance
Depreciation Related To Original Meters
Depreciation Related To Original Meters
Depreciation Related To Original Meters
DOE Cash Payable to Sub Recipients
Accounts Payable, Other, Current
Upfront fee for opt-out of Smart Meter
UpfrontFee
Upfrontfee
Recurring Fees
Recurring Fee
Recurring Fee
Cumulative Consumption Reduction Targets
Cumulative Consumption Reduction Targets
Cumulative consumption reduction targets (as a percentage) of the Energy Efficiency Program over a period of three years.
Proposed funding of estimated costs associated with DLC demand program due to modification of incentive levels for other Phase II programs.
Proposed Funding Of Direc Load Control Program Costs
Amount of proposed funding by utility for estimated cost related to its state sponsored Direct Load Control Demand Reduction Program as a result of modifying incentive levels for other Phase II programs.
Customer Refund
Cash Collected
Customer Refundable Fees, Cash Received
Rate Of Return On Common Equity
Rate Of Return On Common Equity
The rate of return on common equity that a utility is authorized to recover through regulated rates.
Common Equity Component Cap
Common Equity Component Cap
The cap placed by the regulator on the common equity component of the ratio used to determine the weighted average debt and equity return on transmission rate base for a utility.
Capital and OM estimates current year
Captial and OM estimates current year
Captial and O&M estimates current year
Revenue Requirement
Revenue Requirment
Revenue Requirment
Minimum Purchase Obligation
Minimum Purchase Obligation
Maximum Purchase Obligation
Maximum Purchase Obligation
License Costs
License Costs
Rate Of Return On Common Equity In Federal Energy Regulatory Committee Complaint
Rate Of Return On Common Equity In Federal Energy Regulatory Committee Complaint
The rate of return on common equity that a utility is authorized to recover through regulated rates proposed in the FERC transmission complaint.
Transmission Rate Formula, First Basis Points Credited
Transmission Rate Formula, First Basis Points Credited
Transmission Rate Formula, First Basis Points Credited
Interest Expense [Member]
Interest Expense [Member]
Purchased Power And Fuel [Member]
Purchased Power And Fuel [Member]
Total costs incurred and are directly related to energy commodities and services provided during the reporting period.
Purchased Power [Member]
Purchased Power [Member]
This element represents the gains (losses) included in earnings that recognized in purchased power expense.
Change in fair value
Other Derivatives Not Designated As Hedging Instruments Change In Fair Value
Represents the pre-tax mark-to-market gains or losses of certain purchase and sale contracts due to the change in fair value of the derivative contracts held at the reporting date. These contracts do not qualify or are not designated for hedge accounting and represent economic hedges that mitigate exposure to fluctuations in commodity prices and include financial options, futures, swaps, and forward sales.
Reclassification to realized at settlement
Other Derivatives Not Designated As Hedging Instruments Reclassification To Realized At Settlement
Represents the pre-tax mark-to-market gains or losses of certain purchase and sale contracts due to the recognized change in fair value that was reclassified to realized due to settlement of the derivative during the period. These contracts do not qualify or are not designated for hedge accounting and represent economic hedges that mitigate exposure to fluctuations in commodity prices and include financial options, futures, swaps, and forward sales.
Net mark-to-market gains (losses)
Other Derivatives Not Designated As Hedging Instruments Gain Loss Net
Net pre-tax mark-to-market gain or loss on derivative contracts that do not qualify or are not designated for hedge accounting.
Commitments And Contingencies Tables Disclosure [Table]
Commitments And Contingencies Tables Disclosure [Table]
Commitments And Contingencies Tables Disclosure [Line Items]
Commitments And Contingencies Tables Disclosure [Line Items]
Energy Commitments
Energy Commitments [Table Text Block]
Disclosures of short- and long-term energy-related commitments over the next five years and beyond. Types of energy-related commitments include the purchase from and sale to unaffiliated utilities and others of energy, capacity and transmission rights. Data is presented by year and in total.
Utility Energy Purchase Commitments
Utility Energy Purchase Commitments [Table Text Block]
Disclosures of short- and long-term energy-related purchase commitments, including renewable energy credits, by an electric utility company over the next five years and beyond. Data is presented by year and in total.
Fuel Purchase Commitments
Fuel Purchase Commitments [Table Text Block]
Disclosures of short- and long-term fuel purchase commitments over the next five years and beyond. Types of fuel disclosed include nuclear fuel, natural gas and coal. Data is presented by year and in total.
Other Purchase Obligation
Other Purchase Obligation [Table Text Block]
Disclosures of short- and long-term other purchase obligations, over the next five years. Data is presented by year and in total.
Other Commitments
Other Commitments [Table Text Block]
Commercial Commitments
Commercial Commitments [Table Text Block]
Disclosures of short- and long-term commitments potentially triggered by future events, over the next five years and beyond. Data is presented by year and in total.
Accrued environmental liabilities
Schedule of Environmental Loss Contingencies by Site [Table Text Block]
Number of reportable segments
Number of Reportable Segments
Statement of Stockholders' Equity [Abstract]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Subsequent Events [Abstract]
Subsequent Events (Exelon and Generation)
Subsequent Events [Text Block]
Severance Costs
Severance Costs
Nuclear Decommissioning Additional Narrative Information [Table]
Current portion of payable to Zion Solutions
Current Portion Of Payable To Thirdparty To Decommission Nuclear Plant, Funded By Pledged Assets
Current amount of liability as of the balance sheet date associated with the asset sale agreement and transfer of asset retirement obligation to ZionSolutions, included in Other Current Liabilities on the Balance Sheet.
Withdrawals by Zion Solutions to pay decommissioning costs
Withdrawal From Nuclear Decommissioning Funds
The cash outflow from nuclear decommissioning funds during the period.
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plan and Other Postretirement Benefit Plan [Domain]
Defined Benefit Plan and Other Postretirement Benefit Plan [Domain]
Pension Plan, Defined Benefit [Member]
Pension Plan, Defined Benefit [Member]
Other Postretirement Benefit Plan, Defined Benefit [Member]
Other Postretirement Benefit Plan, Defined Benefit [Member]
Service cost
Defined Benefit Plan, Service Cost
Interest cost
Defined Benefit Plan, Interest Cost
Expected return on assets
Defined Benefit Plan, Expected Return on Plan Assets
Amortization of:
Amortization of Prior Service Cost (Benefit) and Actuarial Loss [Abstract]
Amortization of Prior Service Cost (Benefit) and Actuarial Loss [Abstract]
Prior service cost (benefit)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Actuarial loss
Defined Benefit Plan, Amortization of Gains (Losses)
Settlement charges
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements
Net periodic benefit cost
Defined Benefit Plan, Net Periodic Benefit Cost
Pension and Other Postretirement Benefit Costs
Pension And Other Postretirement Benefit Expense Included In Capital And Operating And Maintenance Expense
The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs included in capital and operating and maintenance expense that was recognized during the period for defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain or loss on assets, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments).
Utility taxes
Utility Taxes
Revenue, excise or other taxes incurred by public utility companies.
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements
New Accounting Pronouncements, Policy [Policy Text Block]
Restructuring Charges [Abstract]
Severance (Exelon, Generation, ComEd, PECO and BGE)
Restructuring and Related Activities Disclosure [Text Block]
Income Tax Additional Narrative Information [Table]
Income Tax Additional Narrative Information [Table]
Income Tax Additional Disclosure [Table]
Parent Company [Member]
Parent Company [Member]
Income Tax Additional Narrative Information [Line Items]
Income Tax Additional Narrative Information [Line Items]
Income Tax Additional Disclosure [Line Items]
Unrecognized tax benefits that if recognized would affect the effective tax rate
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities
Increase (Decrease) in Income Taxes
Increase (Decrease) in Income Taxes
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount
Deferred tax gain under involuntary conversion provisions of the IRC
Deferred Income Tax Gain In Voluntary Conversion
The amount of income tax gain deferred in connection with a transaction meeting the involuntary conversion provisions of the Internal Revenue Code.
IRS asserted penalties for understatement of tax
Unrecognized Tax Benefits, Income Tax Penalties Expense
Expected non-cash charge to earnings
Unrecognized Tax Benefits, Interest on Income Taxes Accrued
Non-cash equity contributions
Non Cash Contributions From Parent
The non cash impact of financing from parent as a source that is recorded as additional paid in capital.
Potential tax and interest from a successful IRS challenge of the like-kind exchange transaction position
Income Tax And Penalties From Potential Settle With Taxing Authority
Represents the potential income tax and interest that could become currently payable in the event of a successful challenge by a taxing authority of an entity's income tax position.
Early termination amount
Investment Agreement, Early Termination Fee
Investment Agreement, Early Termination Fee
Taxes Payable, Current
Taxes Payable, Current
Cash tax benefit (detriment) as a result of repair costs deduction
Electric Transmission Distribution Property Repairs Deduction Cash Benefit Detriment
Cash tax benefit (detriment) as a result of adopting the safe harbor method of tax accounting for repair costs associated with transmission and distribution property deduction.
Debt and Credit Agreements (Exelon, Generation, ComEd, PECO and BGE)
Debt Disclosure [Text Block]
Perryman Construction [Member]
Perryman Construction [Member]
Fourmile Construction [Member]
FourmileConstructionMember [Member]
Combine-cycle Turbine Units [Member]
Combine-cycle Turbine Units [Member]
Combine-cycle Turbine Units [Member]
Beebe Construction [Member]
Beebe Construction [Member]
Business Acquisition, Direct Investment With State And Local Governments Due To Settlement
Business Acquisition, Direct Investment With State And Local Governments Due To Settlement
Direct investment to local and state governments for the settlement in a business acquisition.
Business Acquisition, Construction Cost
Business Acquisition, Construction Cost
The portion of the acquisition commitment with the regulatory agencies related to expected construction costs for a new building.
Minimum future operating lease payments due in one year
Operating Leases, Future Minimum Payments Due, Next Twelve Months
Minimum future operating lease payments due in three years
Operating Leases, Future Minimum Payments, Due in Three Years
Minimum future operating lease payments due in four years
Operating Leases, Future Minimum Payments, Due in Four Years
Minimum future operating lease payments due in five years
Operating Leases, Future Minimum Payments, Due in Five Years
Minimum future operating lease payments due beyond five years
Operating Leases Future Minimum Payments Due Beyond Five Years
For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due after the fifth year of the balance sheet date relating to leases defined as operating.
Business Acquisition, Development Of New Generation Cost
Business Acquisition, Development Of New Generation Cost
The portion of the acquisition settlement related to the expected cost of developing new generation.
Business Acquisition, Expected New Generation Mwh
Business Acquisition, Expected New Generation Mwh
The expected capacity of new generation development related to the acquisition settlement.
Noncash Merger Related Costs
New Accounting Pronouncements (Exelon, Generation, ComEd, PECO and BGE)
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]
Schedule of Short-term Debt [Table]
Schedule of Short-term Debt [Table]
Commercial Paper [Member]
Commercial Paper [Member]
Short-term Debt [Line Items]
Short-term Debt [Line Items]
Commercial paper borrowings
Commercial Paper
Exelon Legacy Benefit Plans [Member]
Exelon Legacy Benefit Plans [Member]
Pension and other postretirement plans established under Exelon prior to the merger with Constellation.
Remeasurement [Axis]
Remeasurement [Axis]
Represents Remeasurement of defined benefit pension and post retirement benefit obligation
Remeasurement [Domain]
Remeasurement [Domain]
Represents Remeasurementt for defined benefit pension and post retirement benefit obligation
Remeasurement [Member]
Remeasurement [Member]
Represents valuation adjustment for defined benefit pension and post retirement benefit obligation
Benefit obligation increase (decrease) reflecting actual census data
Defined Benefit Plan Valuation Adjustment
Increase (decrease) in defined benefit obligation due to an updated valuation reflecting actual census data.
Changes in plan assets and benefit obligations recognized in OCI
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Before Tax
The aggregate net gain or loss and net prior service cost or credit recognized in other comprehensive income, including amounts arising during the period and reclassification adjustments of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period.
Increase in regulatory assets due valuation received by Exelon for its legacy pension and other postretirement benefit obligations.
Defined Benefit Plan Amounts Recognized In Regulatory Assets Before Tax
The aggregate net gain or loss and net prior service cost or credit recognized in regulatory assets, including amounts arising during the period and reclassification adjustments of regulatory assets as a result of being recognized as components of net periodic benefit cost for the period.
Increase in regulatory liabilities due to updated valuation of Exelon's legacy pension and postretirement benefit obligations
DefinedBenefitPlanAmountsRecognizedInRegulatoryLiabilitiesBeforeTax
Increase in regulatory liabilites due to updated valuation received by Exelon for its legacy pension and other postretirement benefit obligations.
Pension Obligations Valuation Adjustment
Increase (Decrease) in Pension Plan Obligations
Other postretirement benefit obligation increase (decrease) due to updated valuation adjustment
Defined Benefit Plan Other Postretirement Benefit Obligation Update Pension Opeb
The net increase or decrease in the other postretirement benefit obligation due to the increase or decrease in the value of either the benefit obligation or the plan assets resulting from annual census data used in actuarial assumption.
Regulatory asset increase (decrease) due to updated valuation adjustment
Defined Benefit Plan Regulatory Asset Liability Census Update Pension Opeb
The net increase or decrease in the regulatory asset due to the increase or decrease in the value of either the benefit obligation or the plan assets resulting from annual census data used in actuarial assumption.
Pension And Other Postretirement Benefit Expense Included In Capital And Operating And Maintenance Expense
Regulatory Asset increase (decrease) due to design changes
Defined Benefit Plan Regulatory Asset Liability Design Change Opeb
Increase (decrease) in regulatory asset due to design changes.
Other comprehensive income (loss) due to design changes
Other Comprehensive Income Defined Benefit Plans Design Changes Net Of Tax
The increase (decrease) in accumulated comprehensive income during the period related to design changes of other postretirement benefit plans, after tax. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.
Expected return on assets
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets
Discount rate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate
Expected qualified pension plan contributions
Qualified Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year
The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the qualified pension plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.
Expected non-qualified pension plan contributions
Non Qualified Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year
The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the non-qualified pension plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.
Expected other postretirement benefit plan contributions
Defined Other Postretirement Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year
The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the other postretirement benefit plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.
Undistributed Earnings [Member]
Undistributed Earnings [Member]
Undistributed Earnings.
Common Stock [Member]
Common Stock [Member]
Nonredeemable Preferred Stock [Member]
Nonredeemable Preferred Stock [Member]
Treasury Stock [Member]
Treasury Stock [Member]
Membership Interest [Member]
Membership Interest [Member]
An ownership interest in a limited liability company.
Retained Earnings [Member]
Retained Earnings [Member]
Noncontrolling Interest [Member]
Noncontrolling Interest [Member]
Preference Stock Not Subject To Mandatory Redemption [Member]
Preference Stock Not Subject To Mandatory Redemption [Member]
Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.
Other Additional Capital [Member]
Other Additional Capital [Member]
Retained Earnings, Unappropriated [Member]
Retained Earnings, Unappropriated [Member]
Retained Earnings, Appropriated [Member]
Retained Earnings, Appropriated [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)
Shares, Issued
Beginning Balance
Beginning Balance
Beginning Balance
Noncontrolling Interest, Increase from Sale of Parent Equity Interest
Noncontrolling Interest, Increase from Sale of Parent Equity Interest
Long-term incentive plan activity (in shares)
Stock Issued During Period Shares Long Term Incentive Plan Activity
Number of shares of stock issued under long-term incentive plan activity.
Long-term incentive plan activity
Stock Issued During Period, Value, Long Term Incentive Plan Activity
Change in the value of common stock equity related to long-term incentive plan activity.
Employee stock purchase plan issuances (in shares)
Stock Issued During Period, Shares, Employee Stock Purchase Plans
Employee stock purchase plan issuances
Stock Issued During Period, Value, Employee Stock Purchase Plan
Appropriation of retained earnings for future dividends
Appropriation of Retained Earnings for Future Dividends
Appropriation of retained earnings for future dividends.
Tax benefit on stock compensation
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense
Common stock dividends
Dividends, Common Stock, Cash
Contribution from parent
Members Equity Including Portion Attributable To Noncontrolling Interest Acquisitions
Total of member's equity (deficit) items, including portions attributable to both the parent and noncontrolling interests attributed to an acquisition.
Distribution to members
Distribution to members
Distribution to members.
Allocation of tax benefit from members
Allocation Of Tax Benefit From Members
Allocation of tax benefit from members
Preferred stock redemption premium
Allocation of tax benefit from parent
Allocation Of Tax Benefit From Parent
Allocation Of Tax Benefit From Parent
Consolidated VIE dividend to non-controlling interest
Reversal of CENG equity method AOCI, net of income taxes of $77
OtherComprehensiveIncomeLossNetoOfTaxPeriodDecrease
OtherComprehensiveIncomeLossNetoOfTaxPeriodDecrease
Minority Interest Increase From Acquisition
Minority Interest Increase From Acquisition
Increase in noncontrolling interest balance from acquisition of additional noncontrolling interest holders.
Preferred security dividends
Dividends, Preferred Stock, Cash
Long-term Debt, Excluding Current Maturities
Fair Value of Financing Contract Payments
Fair Value of Financing Contract Payments
Noncontrolling interest acquired
Noncontrolling Interest, Increase from Business Combination
Increase (Decrease) in Pension and Postretirement Obligations
Increase (Decrease) in Pension and Postretirement Obligations
Other comprehensive loss, net of income taxes of $53
Other Comprehensive Income (Loss) excluding Equity Method AOCI, Net of Tax
Other Comprehensive Income (Loss) excluding Equity Method AOCI, Net of Tax
Other comprehensive income (loss), net of tax
Ending Balance
Ending Balance
Ending Balance (in shares)
Ending Balance
Subsequent Event [Table]
Subsequent Event [Table]
Subsequent Event [Line Items]
Subsequent Event [Line Items]
Expected Cash Proceeds on Sale of Assets
Expected Cash Proceeds on Sale of Assets
Expected Cash Proceeds on Sale of Assets
Expected Total Proceeds Working Capital
Expected Total Proceeds Working Capital
Expected Total Proceeds Working Capital
Expected Assets Impairment Charge
Expected Assets Impairment Charge
Expected Assets Impairment Charge
Expected After Tax Net Cash Proceeds
Expected After Tax Net Cash Proceeds
Expected After Tax Net Cash Proceeds
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, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments
Forward Power Basis
Forward Power Basis
Basis adjustment to the forward power price to deliver at an illiquid location.
Forward Gas Basis
Forward Gas Basis
Basis adjustment to the forward gas price to deliver at an illiquid location
Activity of severance obligations for the corporate restructuring (excluding obligations recorded in equity)
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
Restructuring and Related Costs
Restructuring and Related Costs [Table Text Block]
Schedule of Regulatory Liabilities [Table]
Schedule of Regulatory Liabilities [Table]
Regulatory Liability [Axis]
Regulatory Liability [Axis]
Regulatory Liability [Domain]
Regulatory Liability [Domain]
Over Recovered Decoupling Gas Revenue [Member]
Over Recovered Decoupling Gas Revenue [Member]
Represents the over-recovered (regulatory liability) gas distribution costs recoverable from customers. An over recovery means that the actual costs of electricity or natural gas realized by the regulated utility were less than the rates charged to customers during the period and are refundable to customers.
Over Recovered Decoupling Electric Revenue [Member]
Over Recovered Decoupling Electric Revenue [Member]
Represents the over-recovered (regulatory liability) gas distribution costs recoverable from customers. An over recovery means that the actual costs of electricity or natural gas realized by the regulated utility were less than the rates charged to customers during the period and are refundable to customers.
Other Postretirement Benefits [Member]
Other Postretirement Benefits [Member]
Discloses the amount of regulatory asset arising from the net periodic other postretirement benefit costs, according to US GAAP recovered through rate-making proceedings, according to the actions of the regulator.
Nuclear Decommissioning [Member]
Nuclear Decommissioning [Member]
Represents estimated future nuclear decommissioning costs that exceed (regulatory asset) or are less than (regulatory liability) the associated decommissioning trust fund assets.
Removal Costs [Member]
Removal Costs [Member]
Energy Efficiency Demand Response Programs [Member]
Energy Efficiency Demand Response Programs [Member]
Represents the over or under-recovered costs related to energy efficiency and demand response programs.
Dlc Program Cost [Member]
Dlc Program Cost [Member]
Energy Efficiency Phase [Member]
Energy Efficiency Phase [Member]
Electric Transmission And Distribution Tax Repairs [Member]
Electric Transmission And Distribution Tax Repairs [Member]
Represents the expected total refund to customers for the tax cash benefit from the application of the safe harbor method of tax accounting to costs incurred prior to 2010.
Gas Distribution Tax Repairs [Member]
Gas Distribution Tax Repairs [Member]
Represents the expected total refund to customers for the tax cash benefit from the application of the safe harbor method of tax accounting to costs incurred prior to 2011.
Over Recovered Energy And Transmission Costs [Member]
Over Recovered Energy And Transmission Costs [Member]
Represents the over-recovered (regulatory liability) purchased power and/or gas supply related costs refundable to customers. An over recovery means that the actual costs of electricity or natural gas realized by the regulated utility were less than the rates charged to customers during the period and are refundable to customers.
Over-Recovered Universal Service Fund Costs [Member]
Over-Recovered Universal Service Fund Costs [Member]
A regulatory liability that represents the over-recovery of discounts issued to electric and gas customers enrolled in assistance programs.
Revenue Subject to Refund [Member]
Revenue Subject to Refund [Member]
Over Recovered Decoupling Revenue [Member]
Over Recovered Decoupling Revenue [Member]
Regulatory Liabilities Other [Member]
Regulatory Liabilities Other [Member]
Carrying amount as of the balance sheet date of regulatory liabilities which are not elsewhere specified in the taxonomy.
Over-Recovered Natural Gas Costs [Member]
Over-Recovered Natural Gas Costs [Member]
Over-Recovered Natural Gas Costs [Member]
Under-Recovered Electric Supply Costs [Member]
Under-Recovered Electric Supply Costs [Member]
Under-Recovered Electric Supply Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities [Line Items]
Current
Noncurrent
Regulatory Liabilities
Regulatory Liabilities
Income Taxes (Exelon, Generation, ComEd, PECO and BGE)
Income Tax Disclosure [Text Block]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Table]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Table]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Increase (decrease) due to:
Adjustments To Reconcile Federal Statutory Income Tax Rate To Effective Income Tax Rate Continuing Operations [Abstract]
Adjustments to reconcile the domestic federal statutory tax rate to a company's effective income tax rate abstract.
State income taxes, net of Federal income tax benefit
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent
Qualified nuclear decommissioning trust fund income
Effective Income Tax Rate Reconciliation Qualified Nuclear Decommissioning Trust Fund Income Losses
The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by income or losses generated by the qualified nuclear decommissioning trust funds that are taxed at a higher rate.
Domestic production activities deduction
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent
Tax exempt income
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent
Health care reform legislation
Effective Income Tax Rate Reconciliation Elimination Of Deductions Medicare Prescription Drug Benefit
The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the elimination of the deduction previously received for Medicare prescription drug benefits in accordance with the Patient Protection and Affordable Care Act, as modified by the Health Care and Education Reconciliation Act.
Amortization of investment tax credit, net deferred taxes
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent
Plant basis differences
Effective Income Tax Rate Reconciliation Plant Basis Differences
The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference in depreciation and amortization methods allowed under generally accepted accounting principles and enacted tax laws.
Production tax credits and other credits
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent
Noncontrolling interest
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent
Other
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Effective income tax rate
Effective Income Tax Rate Reconciliation, Percent
Temporary Equity, Share Subscriptions
Temporary Equity, Share Subscriptions
Shares Issued, Price Per Share
Shares Issued, Price Per Share
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share
Junior Subordinated Notes, Noncurrent
Junior Subordinated Notes, Noncurrent
Forward Contract Indexed to Issuer's Equity, Indexed Shares
Forward Contract Indexed to Issuer's Equity, Indexed Shares
Analysis and reconciliation of reportable segment information
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Analysis and reconciliation of reportable segment revenues for Generation
Revenue from External Customers by Geographic Areas [Table Text Block]
Credit Risk Exposure [Axis]
Credit Risk Exposure [Axis]
Credit risk exposure segregated by type of scenario.
Credit Risk Exposure [Domain]
Credit Risk Exposure [Domain]
Major categories of credit risk based on the nature and risk.
Net Exposure [Member]
Net Exposure [Member]
Net counterparty exposure after application/netting of collateral.
Total Exposure Before Credit Collateral [Member]
Total Exposure Before Credit Collateral [Member]
Total counterparty exposure before applying/netting collateral.
Credit Collateral [Member]
Credit Collateral [Member]
Credit collateral associated with counterparty exposure.
Number Of Counterparties Greater Than Ten Percent Of Net Exposure [Member]
Number Of Counterparties Greater Than Ten Percent Of Net Exposure [Member]
Number of counterparties greater than 10% of net exposure.
Net Exposure Of Counterparties Greater Than Ten Percent Of Net Exposure [Member]
Net Exposure Of Counterparties Greater Than Ten Percent Of Net Exposure [Member]
Net exposure of counterparties greater than 10% of net exposure.
Investment grade
Investment Grade External Credit Rating
Credit exposure for all derivative instruments, normal purchase-normal sale, and related payables and receivables (net of collateral and instruments that are subject to master netting agreements) with external credit-rating that could be used to describe the current status and performance risk of derivatives and guarantee obligations that connote investment grade.
Non-investment grade
Non Investment Grade External Credit Rating
Credit exposure for all derivative instruments, normal purchase-normal sale, and related payables and receivables (net of collateral and instruments that are subject to master netting agreements) with external credit-rating that could be used to describe the current status and performance risk of derivatives and guarantee obligations that connote non-investment grade.
No external ratings - internally rated - investment grade
Investment Grade Internal Credit Rating
Credit exposure for all derivative instruments, normal purchase-normal sale, and related payables and receivables (net of collateral and instruments that are subject to master netting agreements) with an entity's internal risk assessment as having low risk.
No external ratings - internally rated - non-investment grade
Noninvestment Grade Internal Credit Rating
Credit exposure for all derivative instruments, normal purchase-normal sale, and related payables and receivables (net of collateral and instruments that are subject to master netting agreements) with an entity's internal risk assessment as having high risk.
Investor-owned utilities, marketers and power producers
Investor Owned Utilities Marketers And Power Producers Credit Risk Exposure
Credit exposure for all derivative instruments, normal purchase-normal sale, and related payables and receivables (net of collateral and instruments that are subject to master netting agreements) from group of counterparties comprised of investor-owned utilities, marketers and power producers.
Energy cooperative and municipalities
Energy Cooperatives And Municipalities
Net credit exposure from energy cooperatives and municipalities
Financial institutions
Financial Institutions Credit Risk Exposure
Credit exposure for all derivative instruments, normal purchase-normal sale, and related payables and receivables (net of collateral and instruments that are subject to master netting agreements) from group of counterparties comprised of financial institutions.
Other
Other Credit Risk Exposure
Credit exposure for all derivative instruments, normal purchase-normal sale, and related payables and receivables (net of collateral and instruments that are subject to master netting agreements) from group of counterparties not separately identified elsewhere.
Syndicated Revolver 1 [Member]
Syndicated Revolver One [Member]
Syndicated Revolver One [Member]
Syndicated Revolver 2 [Member]
Syndicated Revolver Two [Member]
Syndicated Revolver Two [Member]
Parent [Member]
Parent [Member]
Lender Name [Axis]
Lender Name [Axis]
Credit Facility [Domain]
Line of Credit Facility, Lender [Domain]
Community and Minority Banks [Member]
Community and Minority Banks [Member]
Community and Minority Banks [Member]
Revolving Credit Facility [Member]
Revolving Credit Facility [Member]
Letter of Credit [Member]
Letter of Credit [Member]
Debt Instrument, Redemption, Period [Axis]
Debt Instrument, Redemption, Period [Axis]
Debt Instrument, Redemption, Period [Domain]
Debt Instrument, Redemption, Period [Domain]
Debt Instrument, Redemption, Period Three [Member]
Debt Instrument, Redemption, Period Three [Member]
Outstanding letters of credit
Letters of Credit Outstanding, Amount
Line of Credit Facility, Current Borrowing Capacity
Line of Credit Facility, Current Borrowing Capacity
Credit Facility [Axis]
Credit Facility [Axis]
Credit Facility [Domain]
Credit Facility [Domain]
Secured Debt [Member]
Secured Debt [Member]
Non Recourse Debt [Member]
Non Recourse Debt [Member]
Senior Loans [Member]
Senior Loans [Member]
Standby Letters of Credit [Member]
Standby Letters of Credit [Member]
ExGen Texas Power, LLC [Member]
ExGen Texas Power, LLC [Member]
ExGen Texas Power, LLC [Member]
ExGen Renewables I, LLC [Member]
ExGen Renewables I, LLC [Member]
Exgen renewable LLC an indirect subsidiary of Exelon and Generation
Amount Of Aggregate Letters of Credit Available
Amount Of Aggregate Letters of Credit Available
The aggregate amount of letters of credit that may be issued under the unsecured revolving credit facility.
Line of Credit Facility, Expiration Date
Line of Credit Facility, Expiration Date
Additional Amount of Aggregate Letters of Credit Available
Additional Amount of Aggregate Letters of Credit Available
Additional Amount of Aggregate Letters of Credit Available
Outstanding borrowings/facility draws
Line of Credit Facility, Amount Outstanding
Cumulative amount in commitments
Line of Credit Facility, Cumulative Committed Amount
Line of Credit Facility, Cumulative Committed Amount
Basis points adders for prime-based borrowings
Basis Points For Prime Based Borrowings
Maximum basis points that can be added to borrowings at prime rate, actual basis points depends on credit rating.
Basis Points For Libor Based Borrowings
Basis Points For Libor Based Borrowings
Maximum basis points that can be added to borrowings at LIBOR, actual basis points depends on credit rating.
Interest Expense, Commercial Paper
Interest Expense, Commercial Paper
equity units issued
Equity Units Issued
Junior subordinate notes issued in the form of equity units
Proceeds from Issuance of Subordinated Long-term Debt
Proceeds from Issuance of Subordinated Long-term Debt
Subordinated Borrowing, Interest Rate
Subordinated Borrowing, Interest Rate
Equity Units, Annual Distribution Rate
Equity Units, Annual Distribution Rate
Equity Units, Annual Distribution Rate
Forward Contract Payment Rate
ForwardContractPaymentRate
Quarterly contract payments representing a proxy for dividend yield investors would receive if shares have been held from inception
Per Unit Conversion Rate For Equity Security Units
Debt Instrument, Convertible, Conversion Price
Market Price required for Equity Unit Conversion
Market Price required for Equity Unit Conversion
Market Price required for Equity Unit Conversion
Common Shares Issueable At Maturity
CommonSharesIssueableAtMaturity
CommonSharesIssueableAtMaturity
Equity Units Share Price
EquityUnitsSharePrice
EquityUnitsSharePrice
Share Price
Share Price
Debt Instrument, Collateral Amount
Debt Instrument, Collateral Amount
Repayments of First Mortgage Bond
Repayments of First Mortgage Bond
Repayments of Secured Debt
Repayments of Secured Debt
Schedule of Regulatory Assets [Table]
Schedule of Regulatory Assets [Table]
DSP Program [Member]
DSP Program [Member]
DSP Program [Member]
Deferred Income Tax Charge [Member]
Deferred Income Tax Charge [Member]
AMI Meter Events [Member]
AMI Meter Events [Member]
This amount represents the cost value of the original smart meters, net of accumulated depreciation and DOE reimbursements, purchased for the first phase of smart meter deployment that will no longer be used, including installation and removal costs.
Loss on Reacquired Debt [Member]
Loss on Reacquired Debt [Member]
Fair Value Of Long Term Debt [Member]
Fair Value Of Long Term Debt [Member]
Adjustment to fair value acquired debt; treated as deferred charges
Fair Value Of Supply Contract [Member]
Fair Value Of Supply Contract [Member]
Adjustment to fair value supply contracts; treated as deferred charges
Asset Retirement Obligation Costs [Member]
Asset Retirement Obligation Costs [Member]
Environmental Restoration Costs [Member]
Environmental Restoration Costs [Member]
RTO Startup Costs [Member]
RTO Startup Costs [Member]
Represents the amount of regulatory assets related to charges incurred by the entity to join a regional transmission organization.
Under Recovered Uncollectible Accounts Expense [Member]
Under Recovered Uncollectible Accounts Expense [Member]
Represents the amount of regulatory assets related to under-recovered (over-recovered) uncollectible accounts expense. The basis for this amount is the difference between the entity's annual uncollectible accounts expense and amounts collected annually.
Renewable Energy And Associated REC [Member]
Renewable Energy And Associated REC [Member]
Regulatory asset related to the recovery of renewable energy and associated RECs from retail customers with no mark up
Under Recovered Energy And Transmission Costs [Member]
Under Recovered Energy And Transmission Costs [Member]
Represents the under-recovered (regulatory asset) purchased power and/or gas supply related costs recoverable from customers. An under recovery means that the actual costs of electricity or natural gas realized by the regulated utility were more than the rates charged to customers during the period and are recoverable from customers.
Deferred Storm Costs [Member]
Deferred Storm Costs [Member]
Significant storm costs deferred in a regulatory asset
Electric Generation Related Regulatory Asset [Member]
Electric Generation Related Regulatory Asset [Member]
Costs recorded to a regulatory asset related to electric generation
Rate Stabilization Deferral [Member]
Rate Stabilization Deferral [Member]
Costs deferred to a regulatory asset to stabilize customer rates
Merger Integration Costs [Member]
Merger Integration Costs [Member]
ConservativeVoltageReductionProgram [Member]
ConservativeVoltageReductionProgram [Member]
ConservativeVoltageReductionProgram [Member]
Regulatory Assets [Member]
Regulatory Assets [Member]
Carrying amount as of the balance sheet date of regulatory assets which are not elsewhere specified in the taxonomy.
Under Recovered Decoupling Revenue [Member]
Under Recovered Decoupling Revenue [Member]
Represents the under-recovered (regulatory asset) distribution costs recoverable from customers. An under recovery means that the actual costs of electricity or natural gas realized by the regulated utility were more than the rates charged to customers during the period and are recoverable from customers.
Over Recovered Electric Energy And Transmission Costs [Member]
Over Recovered Electric Energy And Transmission Costs [Member]
Represents the over-recovered (regulatory liability) electric supply related costs refundable to customers. An over recovery means that the actual costs of electic energy realized by the regulated utility were less than the rates charged to customers during the period and are refundable to customers.
Under-Recovered Electric Revenue Decoupling [Member]
Under-Recovered Electric Revenue Decoupling [Member]
Under-Recovered Electric Revenue Decoupling [Member]
Regulatory Assets [Line Items]
Regulatory Assets [Line Items]
Current
Noncurrent
Regulatory Assets
Regulatory Assets
Derivative Instruments (Exelon, Generation, ComEd, PECO and BGE)
Derivative Instruments and Hedging Activities Disclosure [Text Block]
DebtInstrumentProjects [Axis]
DebtInstrumentProjects [Axis]
Projects for which debt instrunments were issued for funding
Debt Instrument Projects [Domain]
Debt Instrument Projects [Domain]
Projects for which debt instuments were issued for funding
Continetal Wind [Member]
Continetal Wind [Member]
Debt issued for the funding of the ContinentalWindProject
Fixed Rate Debt [Member]
Fixed Rate Debt [Member]
Bonds whose interest rate is fixed at a stated rate per the terms of the debt agreements.
Long Term Debt Retirements [Member]
Long Term Debt Retirements [Member]
Retirements of long-term debt during the period.
Pollution Control Notes [Member]
Pollution Control Notes [Member]
Debt security from a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer. New issues of these bonds are prohibited under the 1986 Tax Law.
Capital Lease Obligations [Member]
Capital Lease Obligations [Member]
Rate Stabilization Bonds, April 1, 2017 [Member]
Rate Stabilization Bonds, April 1, 2017 [Member]
SeniorSecuredNotes525January152014Member [Member]
SeniorSecuredNotes525January152014Member [Member]
Long Term Debt issued Senior Secured Notes 5.25% interest rate due January152014
Kennett Square Capital Lease, 7.83%, September 20, 2020 [Member]
Kennett Square Capital Lease, 7.83%, September 20, 2020 [Member]
ExgenRenewables425February62021 [Member]
ExgenRenewables425February62021 [Member]
ExgenRenewables425February62021 [Member]
Clear Horizon solar [Member]
Clear Horizon solar [Member]
Clear Horizon solar [Member]
Sacramento Solar [Member]
Sacramento Solar [Member]
Represents ownership in Sacramento Solar, a non-consolidated solar energy generator.
FirstMortgageBond163January12014 [Member]
FirstMortgageBond163January12014 [Member]
Long term debt issued First Mortgage Bond 1.63 percent due January 1,2014
Medium Term, Notes 6.73% 6.75% June 15, 2012 [Member]
Medium Term, Notes 6.73% 6.75% June 15, 2012 [Member]
Armstrong Co Tax Exempt, 5% December 1,2042 [Member]
Armstrong Co Tax Exempt, 5% December 1,2042 [Member]
MEDCO Tax-Exempt Bonds [Member]
MEDCO Tax-Exempt Bonds [Member]
Supplemental Balance Sheet Information [Table]
Schedule disclosing additional information about a registrants assets and liabilities in their statement of financial position.
Supplemental Balance Sheet Information [Line Items]
Supplemental Balance Sheet Information [Line Items]
Supplemental Balance Sheet Information.
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Allowance for uncollectible accounts
Allowance for Doubtful Accounts Receivable, Current
Accumulated amortization of nuclear fuel
Accumulated Amortization Nuclear Fuel
The cumulative amount of amortization of nuclear fuel in the reactor core that has been recognized in the income statement.
Payments
Derivative, Loss on Derivative
Derivative, Loss on Derivative
Derivative, Gain on Derivative
Derivative, Gain on Derivative
Gain (Loss) on Fair Value Hedges Recognized in Earnings
Gain (Loss) on Fair Value Hedges Recognized in Earnings
Derivative, Net Hedge Ineffectiveness Gain (Loss)
Derivative, Net Hedge Ineffectiveness Gain (Loss)
Schedule of Short-term Debt
Schedule of Short-term Debt [Table Text Block]
Schedule Of Issuance Of Long Term Debt
Schedule Of Issuance Of Long Term Debt [Table Text Block]
Schedule itemizing the issuances of long-term debt during the period capturing: (1) type of debt issuance; (2) interest rate; (3) maturity date; (4) amount issued; and (5) the intended use of proceeds.
Schedule of Long-term Debt Instruments
Schedule of Long-term Debt Instruments [Table Text Block]
Retirement and Redemptions of Current and Long-Term Debt
Schedule of Extinguishment of Debt [Table Text Block]
Asbestos Loss Contingency [Abstract]
Asbestos Loss Contingency [Abstract]
Abstract for disclosures related to asbestos-related personal injury claims and related reserves.
Asbestos liability reserve
Asbestos Loss Contingency Accrual At Carrying Value
The carrying amount as of the balance sheet date of the combined total of asbestos-related loss contingency reserves.
Asbestos liability reserve related to open claims
Asbestos Loss Contingency Accrual At Carrying Value Related To Open Claims
The carrying amount as of the balance sheet date of the total asbestos-related loss contingency reserves related to personal injury claims already presented to the entity.
Open asbestos liability claims
Open Asbestos Related Personal Injury Claims
The total amount as of the balance sheet date of asbestos-related personal injury claims presented to the entity.
Asbestos liability reserve related to anticipated claims
Asbestos Loss Contingency Accrual At Carrying Value Related To Anticipated Claims
The carrying amount as of the balance sheet date of the total asbestos-related loss contingency reserves related to anticipated personal injury claims. The number of anticipated personal injury claims is based on actuarial assumptions and analyses, which are updated on an annual basis.
Number of claimants
Loss Contingency, Pending Claims, Number
Continuous Power Interruption [Abstract]
Continuous Power Interruption [Abstract]
Abstract for regulation related to continuous power interuption under the Illinois Public Utilities Act.
Minimum number of customers ComEd can be held liable to for power interruption
Minimum Customers Power Interruption
The minimum number of customers experiencing four or more hours of power interruption to which utility company can be held liable under state law.
Number of customers affected by a major storm
Customers Affected By Major Storms
The numbers of customers affected by a major storm.
Number of customers proposed by the ICC that ComEd should not be granted a waiver under Continuous Power Interruption
Number Of Customers Waiver Not Granted
Number of customers proposed by the ICC that ComEd should not be granted a waiver under Continuous Power Interruption
Telephone Consumer Protection Act Lawsuit [Abstract]
Telephone Consumer Protection Act Lawsuit [Abstract]
Telephone Consumer Protection Act Lawsuit
Possible Defendants Number
PossibleDefendantsNumber
Loss Contingency, Damages Sought, Value
Loss Contingency, Damages Sought, Value
Restricted cash
Accounts receivable, net
Accounts Receivable, Net [Abstract]
Inventory
Other current assets
Total noncurrent assets
Assets, Noncurrent
Other current liabilities
Pension obligation(a)
Other noncurrent liabilities
Impairment of Long-Lived Assets (Exelon and Generation)
Impairment Of Long Lived Assets Held [Text Block]
Common Stock, Shares Authorized
Common Stock, Shares Authorized