Rollover receipts EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Plan interest in the net assets of the Exelon Corporation Defined Contribution Retirement Plans Master Trust EBP, Investment, Fair Value EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Legal Entity [Axis] Legal Entity [Axis] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Net increase EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EBP, Related Party and Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Text Block] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total receivables EBP, Receivable Text Block [Abstract] Investments, at fair value EBP, Investment, Fair Value [Abstract] Participant withdrawals and distributions EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Employer fixed company match EBP, Change in Net Asset Available for Benefit, Increase from Employer Fixed Match EBP, Change in Net Asset Available for Benefit, Increase from Employer Fixed Match EBP, Statement of Net Asset Available for Benefit [Abstract] NET ASSETS AVAILABLE FOR BENEFITS EBP, Asset EBP 001 EBP 001 [Member] EBP 001 EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Document Period End Date Document Period End Date Amendment Flag Amendment Flag Plan interest in the net investment income from the Exelon Corporation Defined Contribution Retirement Plans Master Trust EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Change in Plan Interest in Master Trust Participant EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution EBP, Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Expense EBP, Expense [Policy Text Block] Receivables EBP, Receivable [Abstract] EBP, Investment EBP, Investment [Policy Text Block] Participant contributions EBP, Participant Contribution, Receivable Document Type Document Type EBP, Plan Termination EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key EBP, Use of Estimate EBP, Use of Estimate [Policy Text Block] EBP, Plan Transfers EBP, Plan Transfers [Text Block] EBP, Plan Transfers Cover [Abstract] EBP, Risk and Uncertainty EBP, Risk and Uncertainty [Text Block] Notes receivable from participants EBP, Note Receivable from Participant Employer automatic company contribution EBP, Change in Net Asset Available for Benefit, Increase from Employer Non-discretionary Fixed EBP, Change in Net Asset Available for Benefit, Increase from Employer Non-discretionary Fixed EBP, Summary of Accounting Policy EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Document Fiscal Period Focus Document Fiscal Period Focus Interest income from notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution EBP, Subsequent Event EBP, Subsequent Event [Text Block] EBP, Tax Status EBP, Tax Status [Text Block] EBP, Description of Plan EBP, Description of Plan [Text Block] EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Employer variable company match EBP, Change in Net Asset Available for Benefit, Increase from Employer Profit-sharing Match EBP, Change in Net Asset Available for Benefit, Increase from Employer Profit-sharing Match ADDITIONS EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Document Information [Table] Document Information [Table] Fixed match and automatic company contributions EBP, Fixed Contribution EBP, Fixed Contribution EBP, Contribution EBP, Contribution [Policy Text Block] EBP, Note Receivable from Participant EBP, Note Receivable from Participant [Policy Text Block] Total investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Total additions EBP, Change in Net Asset Available for Benefit, Increase Contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution [Abstract] Document [Domain] Document [Domain] Beginning of year End of year EBP, Net Asset Available for Benefit Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Entity [Domain] Entity [Domain] Current Fiscal Year End Date Current Fiscal Year End Date Document Information, Document [Axis] Document Information, Document [Axis] Document Information [Line Items] Document Information [Line Items] ASSETS EBP, Statement of Net Asset Available for Benefit [Line Items] Variable company match contributions EBP, Profit Sharing Contribution EBP, Profit Sharing Contribution