Regulatory Matters (Details) (USD $)	0 Months Ended	1 Months Ended	12 Months Ended																																																																														12 Months Ended				0 Months Ended		1 Months Ended	6 Months Ended	12 Months Ended																																																																													12 Months Ended			12 Months Ended	9 Months Ended	12 Months Ended																																																																														12 Months Ended			0 Months Ended		3 Months Ended		9 Months Ended	12 Months Ended																																																																														0 Months Ended
	Dec. 19, 2013	Sep. 30, 2008	Dec. 31, 2013 MW		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2013 Nuclear Decommissioning [Member]	Dec. 31, 2012 Nuclear Decommissioning [Member]	Dec. 31, 2013 Removal Costs [Member]	Dec. 31, 2012 Removal Costs [Member]	Dec. 31, 2013 Energy Efficiency Demand Response Programs [Member]	Dec. 31, 2012 Energy Efficiency Demand Response Programs [Member]	Dec. 31, 2013 Electric Transmission And Distribution Tax Repairs [Member]	Dec. 31, 2012 Electric Transmission And Distribution Tax Repairs [Member]	Dec. 31, 2013 Over Recovered Distribution Services Costs [Member]	Dec. 31, 2013 Over Recovered Uncollectible Accounts Expense [Member]	Dec. 31, 2012 Over Recovered Uncollectible Accounts Expense [Member]	Dec. 31, 2013 Over Recovered Energy And Transmission Costs [Member]	Dec. 31, 2012 Over Recovered Energy And Transmission Costs [Member]	Dec. 31, 2013 Over-Recovered Universal Service Fund Costs [Member]	Dec. 31, 2012 Over-Recovered Universal Service Fund Costs [Member]	Dec. 31, 2012 Over-Recovered AEPS Costs [Member]	Dec. 31, 2013 Revenue subject to refund [Member]	Dec. 31, 2012 Revenue subject to refund [Member]	Dec. 31, 2013 Over Recovered Decoupling Gas Revenue [Member]	Dec. 31, 2012 Over Recovered Decoupling Gas Revenue [Member]	Dec. 31, 2013 Gas Distribution Tax Repairs [Member]	Dec. 31, 2012 Gas Distribution Tax Repairs [Member]	Dec. 31, 2013 Regulatory Liabilities Other [Member]	Dec. 31, 2012 Regulatory Liabilities Other [Member]	Dec. 31, 2013 Dlc Program Cost [Member]	Dec. 31, 2013 Energy Efficiency Phase [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member]	Dec. 31, 2013 Deferred Income Taxes [Member]	Dec. 31, 2012 Deferred Income Taxes [Member]	Dec. 31, 2013 AMI Expenses [Member]	Dec. 31, 2012 AMI Expenses [Member]	Dec. 31, 2013 AMI Meter Events [Member]	Dec. 31, 2012 AMI Meter Events [Member]	Dec. 31, 2013 Under Recovered Distribution Service Costs [Member]	Dec. 31, 2012 Under Recovered Distribution Service Costs [Member]	Dec. 31, 2013 Debt Costs [Member]	Dec. 31, 2012 Debt Costs [Member]	Dec. 31, 2013 Fair Value Of Long Term Debt [Member]	Dec. 31, 2012 Fair Value Of Long Term Debt [Member]	Dec. 31, 2013 Fair Value Of Supply Contract [Member]	Dec. 31, 2012 Fair Value Of Supply Contract [Member]	Dec. 31, 2013 Severance [Member]	Dec. 31, 2012 Severance [Member]	Dec. 31, 2013 Asset Retirement Obligations [Member]	Dec. 31, 2012 Asset Retirement Obligations [Member]	Dec. 31, 2013 MGP Remediation Costs [Member]	Dec. 31, 2012 MGP Remediation Costs [Member]	Dec. 31, 2013 RTO Startup Costs [Member]	Dec. 31, 2012 RTO Startup Costs [Member]	Dec. 31, 2012 Under Recovered Universal Service Fund Costs Member [Member]	Dec. 31, 2013 Under Recovered Uncollectible Accounts Expense [Member]	Dec. 31, 2012 Financial Swap with Generation [Member]	Dec. 31, 2013 Renewable Energy And Associated REC [Member]	Dec. 31, 2012 Renewable Energy And Associated REC [Member]	Dec. 31, 2013 Under Recovered Energy And Transmission Costs [Member]	Dec. 31, 2012 Under Recovered Energy And Transmission Costs [Member]	Dec. 31, 2012 DSP Program Electric Procurement Contracts [Member]	Dec. 31, 2012 DSP II Program Electric Procurement Contracts [Member]	Dec. 31, 2013 Deferred Storm Costs [Member]	Dec. 31, 2012 Deferred Storm Costs [Member]	Dec. 31, 2013 Electric Generation Related Regulatory Asset [Member]	Dec. 31, 2012 Electric Generation Related Regulatory Asset [Member]	Dec. 31, 2013 Rate Stabilization Deferral [Member]	Dec. 31, 2012 Rate Stabilization Deferral [Member]	Dec. 31, 2013 Energy Efficiency And Demand Response Programs [Member]	Dec. 31, 2012 Energy Efficiency And Demand Response Programs [Member]	Dec. 31, 2012 Capitalization OfElectric Transmission Costs [Member]	Dec. 31, 2013 Merger Integration Costs [Member]	Dec. 31, 2013 Regulatory Assets [Member]	Dec. 31, 2012 Regulatory Assets [Member]	Dec. 31, 2013 Regional Transmission Expansion Plan	Dec. 31, 2013 Exelon Generation Co L L C [Member]	Dec. 31, 2012 Exelon Generation Co L L C [Member]	Dec. 31, 2011 Exelon Generation Co L L C [Member]	Dec. 31, 2013 Exelon Generation Co L L C [Member] Nuclear Generation [Member] Salem [Member]	Dec. 19, 2013 Commonwealth Edison Co [Member]	Dec. 19, 2012 Commonwealth Edison Co [Member]	Sep. 30, 2008 Commonwealth Edison Co [Member]	Jun. 30, 2013 Commonwealth Edison Co [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member]		Dec. 31, 2012 Commonwealth Edison Co [Member]		Dec. 31, 2011 Commonwealth Edison Co [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Nuclear Decommissioning [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Nuclear Decommissioning [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Removal Costs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Removal Costs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Energy Efficiency Demand Response Programs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Energy Efficiency Demand Response Programs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Electric Transmission And Distribution Tax Repairs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Electric Transmission And Distribution Tax Repairs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Over Recovered Distribution Services Costs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Over Recovered Uncollectible Accounts Expense [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Over Recovered Uncollectible Accounts Expense [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Over Recovered Energy And Transmission Costs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Over Recovered Energy And Transmission Costs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Over-Recovered Universal Service Fund Costs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Over-Recovered Universal Service Fund Costs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Over-Recovered AEPS Costs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Revenue subject to refund [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Revenue subject to refund [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Over Recovered Decoupling Gas Revenue [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Over Recovered Decoupling Gas Revenue [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Gas Distribution Tax Repairs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Gas Distribution Tax Repairs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Regulatory Liabilities Other [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Regulatory Liabilities Other [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Dlc Program Cost [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Energy Efficiency Phase [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Other Postretirement Benefits [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Other Postretirement Benefits [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Other Postretirement Benefits [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Deferred Income Taxes [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Deferred Income Taxes [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] AMI Expenses [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] AMI Expenses [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] AMI Meter Events [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] AMI Meter Events [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Under Recovered Distribution Service Costs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Under Recovered Distribution Service Costs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Debt Costs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Debt Costs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Fair Value Of Long Term Debt [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Fair Value Of Long Term Debt [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Fair Value Of Supply Contract [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Fair Value Of Supply Contract [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Severance [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Severance [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Asset Retirement Obligations [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Asset Retirement Obligations [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] MGP Remediation Costs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] MGP Remediation Costs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] RTO Startup Costs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] RTO Startup Costs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Under Recovered Universal Service Fund Costs Member [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Under Recovered Uncollectible Accounts Expense [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Financial Swap with Generation [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Renewable Energy And Associated REC [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Renewable Energy And Associated REC [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Under Recovered Energy And Transmission Costs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Under Recovered Energy And Transmission Costs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] DSP Program Electric Procurement Contracts [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] DSP II Program Electric Procurement Contracts [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Deferred Storm Costs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Deferred Storm Costs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Electric Generation Related Regulatory Asset [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Electric Generation Related Regulatory Asset [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Rate Stabilization Deferral [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Rate Stabilization Deferral [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Energy Efficiency And Demand Response Programs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Energy Efficiency And Demand Response Programs [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Capitalization OfElectric Transmission Costs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Merger Integration Costs [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Regulatory Assets [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Regulatory Assets [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Minimum [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] Maximum [Member]	Dec. 31, 2013 Commonwealth Edison Co [Member] AMI Expenses [Member]	Dec. 31, 2012 Commonwealth Edison Co [Member] Under Recovered Distribution Service Costs [Member]	Sep. 30, 2013 PECO Energy Co [Member]	Dec. 31, 2013 PECO Energy Co [Member] AlternativeEnergyCredits SmartMeters		Dec. 31, 2012 PECO Energy Co [Member]		Dec. 31, 2011 PECO Energy Co [Member]	Dec. 16, 2010 PECO Energy Co [Member]	Dec. 31, 2013 PECO Energy Co [Member] Nuclear Decommissioning [Member]	Dec. 31, 2012 PECO Energy Co [Member] Nuclear Decommissioning [Member]	Dec. 31, 2013 PECO Energy Co [Member] Removal Costs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Removal Costs [Member]	Dec. 31, 2013 PECO Energy Co [Member] Energy Efficiency Demand Response Programs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Energy Efficiency Demand Response Programs [Member]	Dec. 31, 2013 PECO Energy Co [Member] Electric Transmission And Distribution Tax Repairs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Electric Transmission And Distribution Tax Repairs [Member]	Dec. 31, 2013 PECO Energy Co [Member] Over Recovered Distribution Services Costs [Member]	Dec. 31, 2013 PECO Energy Co [Member] Over Recovered Uncollectible Accounts Expense [Member]	Dec. 31, 2012 PECO Energy Co [Member] Over Recovered Uncollectible Accounts Expense [Member]	Dec. 31, 2013 PECO Energy Co [Member] Over Recovered Energy And Transmission Costs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Over Recovered Energy And Transmission Costs [Member]	Dec. 31, 2013 PECO Energy Co [Member] Over-Recovered Universal Service Fund Costs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Over-Recovered Universal Service Fund Costs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Over-Recovered AEPS Costs [Member]	Dec. 31, 2013 PECO Energy Co [Member] Revenue subject to refund [Member]	Dec. 31, 2012 PECO Energy Co [Member] Revenue subject to refund [Member]	Dec. 31, 2013 PECO Energy Co [Member] Over Recovered Decoupling Gas Revenue [Member]	Dec. 31, 2012 PECO Energy Co [Member] Over Recovered Decoupling Gas Revenue [Member]	Dec. 31, 2013 PECO Energy Co [Member] Gas Distribution Tax Repairs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Gas Distribution Tax Repairs [Member]	Dec. 31, 2013 PECO Energy Co [Member] Regulatory Liabilities Other [Member]	Dec. 31, 2012 PECO Energy Co [Member] Regulatory Liabilities Other [Member]	Dec. 31, 2013 PECO Energy Co [Member] Dlc Program Cost [Member]	Dec. 31, 2013 PECO Energy Co [Member] Energy Efficiency Phase [Member]	Dec. 31, 2013 PECO Energy Co [Member] Other Postretirement Benefits [Member]	Dec. 31, 2013 PECO Energy Co [Member] Other Postretirement Benefits [Member]	Dec. 31, 2012 PECO Energy Co [Member] Other Postretirement Benefits [Member]	Dec. 31, 2013 PECO Energy Co [Member] Deferred Income Taxes [Member]	Dec. 31, 2012 PECO Energy Co [Member] Deferred Income Taxes [Member]	Dec. 31, 2013 PECO Energy Co [Member] AMI Expenses [Member]	Dec. 31, 2012 PECO Energy Co [Member] AMI Expenses [Member]	Dec. 31, 2013 PECO Energy Co [Member] AMI Meter Events [Member]	Dec. 31, 2012 PECO Energy Co [Member] AMI Meter Events [Member]	Dec. 31, 2013 PECO Energy Co [Member] Under Recovered Distribution Service Costs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Under Recovered Distribution Service Costs [Member]	Dec. 31, 2013 PECO Energy Co [Member] Debt Costs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Debt Costs [Member]	Dec. 31, 2013 PECO Energy Co [Member] Fair Value Of Long Term Debt [Member]	Dec. 31, 2012 PECO Energy Co [Member] Fair Value Of Long Term Debt [Member]	Dec. 31, 2013 PECO Energy Co [Member] Fair Value Of Supply Contract [Member]	Dec. 31, 2012 PECO Energy Co [Member] Fair Value Of Supply Contract [Member]	Dec. 31, 2013 PECO Energy Co [Member] Severance [Member]	Dec. 31, 2012 PECO Energy Co [Member] Severance [Member]	Dec. 31, 2013 PECO Energy Co [Member] Asset Retirement Obligations [Member]	Dec. 31, 2012 PECO Energy Co [Member] Asset Retirement Obligations [Member]	Dec. 31, 2013 PECO Energy Co [Member] MGP Remediation Costs [Member]	Dec. 31, 2012 PECO Energy Co [Member] MGP Remediation Costs [Member]	Dec. 31, 2013 PECO Energy Co [Member] RTO Startup Costs [Member]	Dec. 31, 2012 PECO Energy Co [Member] RTO Startup Costs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Under Recovered Universal Service Fund Costs Member [Member]	Dec. 31, 2013 PECO Energy Co [Member] Under Recovered Uncollectible Accounts Expense [Member]	Dec. 31, 2012 PECO Energy Co [Member] Financial Swap with Generation [Member]	Dec. 31, 2013 PECO Energy Co [Member] Renewable Energy And Associated REC [Member]	Dec. 31, 2012 PECO Energy Co [Member] Renewable Energy And Associated REC [Member]	Dec. 31, 2013 PECO Energy Co [Member] Under Recovered Energy And Transmission Costs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Under Recovered Energy And Transmission Costs [Member]	Dec. 31, 2012 PECO Energy Co [Member] DSP Program Electric Procurement Contracts [Member]	Dec. 31, 2012 PECO Energy Co [Member] DSP II Program Electric Procurement Contracts [Member]	Dec. 31, 2013 PECO Energy Co [Member] Deferred Storm Costs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Deferred Storm Costs [Member]	Dec. 31, 2013 PECO Energy Co [Member] Electric Generation Related Regulatory Asset [Member]	Dec. 31, 2012 PECO Energy Co [Member] Electric Generation Related Regulatory Asset [Member]	Dec. 31, 2013 PECO Energy Co [Member] Rate Stabilization Deferral [Member]	Dec. 31, 2012 PECO Energy Co [Member] Rate Stabilization Deferral [Member]	Dec. 31, 2013 PECO Energy Co [Member] Energy Efficiency And Demand Response Programs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Energy Efficiency And Demand Response Programs [Member]	Dec. 31, 2012 PECO Energy Co [Member] Capitalization OfElectric Transmission Costs [Member]	Dec. 31, 2013 PECO Energy Co [Member] Merger Integration Costs [Member]	Dec. 31, 2013 PECO Energy Co [Member] Regulatory Assets [Member]	Dec. 31, 2012 PECO Energy Co [Member] Regulatory Assets [Member]	Dec. 31, 2013 PECO Energy Co [Member] Minimum [Member]	Dec. 31, 2013 PECO Energy Co [Member] Maximum [Member]	Dec. 31, 2013 PECO Energy Co [Member] Regional Transmission Expansion Plan	Jun. 01, 2013 PECO Energy Co [Member] Energy Efficiency And Demand Response Programs [Member]	Jul. 27, 2012 Baltimore Gas and Electric Company [Member]	Sep. 30, 2013 Baltimore Gas and Electric Company [Member]	Jun. 30, 2013 Baltimore Gas and Electric Company [Member]	Sep. 30, 2013 Baltimore Gas and Electric Company [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] SmartMeters		Dec. 31, 2012 Baltimore Gas and Electric Company [Member]		Dec. 31, 2011 Baltimore Gas and Electric Company [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Nuclear Decommissioning [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Nuclear Decommissioning [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Removal Costs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Removal Costs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Energy Efficiency Demand Response Programs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Energy Efficiency Demand Response Programs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Electric Transmission And Distribution Tax Repairs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Electric Transmission And Distribution Tax Repairs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Over Recovered Distribution Services Costs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Over Recovered Uncollectible Accounts Expense [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Over Recovered Uncollectible Accounts Expense [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Over Recovered Energy And Transmission Costs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Over Recovered Energy And Transmission Costs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Over-Recovered Universal Service Fund Costs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Over-Recovered Universal Service Fund Costs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Over-Recovered AEPS Costs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Revenue subject to refund [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Revenue subject to refund [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Over Recovered Decoupling Gas Revenue [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Over Recovered Decoupling Gas Revenue [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Gas Distribution Tax Repairs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Gas Distribution Tax Repairs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Regulatory Liabilities Other [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Regulatory Liabilities Other [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Dlc Program Cost [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Energy Efficiency Phase [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Other Postretirement Benefits [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Other Postretirement Benefits [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Other Postretirement Benefits [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Deferred Income Taxes [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Deferred Income Taxes [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] AMI Expenses [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] AMI Expenses [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] AMI Meter Events [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] AMI Meter Events [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Under Recovered Distribution Service Costs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Under Recovered Distribution Service Costs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Debt Costs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Debt Costs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Fair Value Of Long Term Debt [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Fair Value Of Long Term Debt [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Fair Value Of Supply Contract [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Fair Value Of Supply Contract [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Severance [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Severance [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Asset Retirement Obligations [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Asset Retirement Obligations [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] MGP Remediation Costs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] MGP Remediation Costs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] RTO Startup Costs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] RTO Startup Costs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Under Recovered Universal Service Fund Costs Member [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Under Recovered Uncollectible Accounts Expense [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Financial Swap with Generation [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Renewable Energy And Associated REC [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Renewable Energy And Associated REC [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Under Recovered Energy And Transmission Costs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Under Recovered Energy And Transmission Costs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] DSP Program Electric Procurement Contracts [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] DSP II Program Electric Procurement Contracts [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Deferred Storm Costs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Deferred Storm Costs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Electric Generation Related Regulatory Asset [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Electric Generation Related Regulatory Asset [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Rate Stabilization Deferral [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Rate Stabilization Deferral [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Energy Efficiency And Demand Response Programs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Energy Efficiency And Demand Response Programs [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Capitalization OfElectric Transmission Costs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Merger Integration Costs [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Regulatory Assets [Member]	Dec. 31, 2012 Baltimore Gas and Electric Company [Member] Regulatory Assets [Member]	Dec. 31, 2013 Baltimore Gas and Electric Company [Member] Regional Transmission Expansion Plan	Dec. 16, 2010 Baltimore Gas and Electric Company [Member] MGP Remediation Costs [Member]	Dec. 31, 2006 Baltimore Gas and Electric Company [Member] MGP Remediation Costs [Member]
Operating And Maintenance For Regulatory Required Programs [Line Items]
Total operating and maintenance for regulatory required programs
Purchase Of Receivables [Abstract]
POR gross receivables			263,000,000	[1]	191,000,000	[1]																																																																																			105,000,000	[1]	55,000,000	[1]																																																																															72,000,000	[1]	65,000,000	[1]																																																																																			86,000,000	[1]	71,000,000	[1]
POR Allowance for uncollectible accounts			(30,000,000)	[2]	(21,000,000)	[2]																																																																																			(16,000,000)	[2]	(9,000,000)	[2]																																																																															(7,000,000)	[2]	(6,000,000)	[2]																																																																																			(7,000,000)	[2]	(6,000,000)	[2]
POR net receivables			233,000,000		170,000,000																																																																																				89,000,000		46,000,000																																																																																65,000,000		59,000,000																																																																																				79,000,000		65,000,000
Energy Infrastructure Modernization Act [Abstract]
Additional investment to modernize system and implement smart grid technology.																																																																																									2,600,000,000
Annual contribution to fund customer assistance programs																																																																																									10,000,000
Contribution to a science and technology innovation trust																																																																																									15,000,000
Subsequent annual contributions to the trust																																																																																									4,000,000
Current length of state legislation enacted																																																																																									10 years
Planned capital spend by a utility under state enacted legislation																																																																																									233,000,000
Annual revenue requirement reduction																																																																																								14,000,000	168,000,000
Annual revenue requirement reduction incremental to proposal																																																																																									110,000,000
Annual revenue requirement incremental reduction attributable to alternative recovery																																																																																									50,000,000
Annual revenue requirement incremental reduction attributable to pensions																																																																																									35,000,000		60,000,000
Annual revenue requirement incremental reduction attributable to incentives																																																																																									10,000,000
Annual revenue requirement incremental reduction attributable to other adjustments																																																																																									15,000,000		75,000,000
Regulatory asset reduction due to final order																																																																																									100,000,000
Over or Under recovered distribution service costs																																																																																									125,000,000																																																																																377,000,000
Under recovered distribution service costs related to one time events																																																																																									84,000,000																																																																																86,000,000
Deferral of AMI plan																																																																																									50,000,000
Deferral of additional capital investment																																																																																									15,000,000
Regulatory asset for the accelerated depreciation of non-AMI meters																																																																																									7,000,000																																																																															35,000,000
Increased revenue requirement																																																																																					341,000,000	73,000,000		353,000,000
Expected revenue adjustment in subsequent quarter																																																																																									135,000,000
Expected revenue adjustment for prior year																																																																																								42,000,000	181,000,000		7,000,000
Expected revenue adjustment for current year																																																																																									160,000,000		80,000,000
Regulatory assets due to deferred storm costs																																																																																									58,000,000																																																																																58,000,000
Regulatory assets due to merger and integration-related costs																																																																																									26,000,000																																																																																28,000,000
Other regulatory assets due to merger and integration-related costs																																																																																																																																																																																																																																																																	1,000,000
Revenue reduction impact by ICC issued final order			8,000,000
Illinois Settlement Agreement [Abstract]
Overall rate relief contribution			1,000,000,000																																																																																747,000,000
Rate relief to ComEd customers																																																																																			435,000,000										64,000,000
Rate relief to other Illinois Utilities																																																																																			308,000,000
Contribution to IPA																																																																																			5,000,000
Annual energy savings requirement																																																																																									0.20%																																																																																																																																																																			3.00%
Demand response peak demand reduction																																																																																									2.00%																																																																																																																																																																			4.50%
Renewable energy procurement																																																																																									2.00%
Distribution Rate Case [Abstract]
Requested increase in electric revenues																																																																																													396,000,000																																																																																																																																																																81,000,000		101,000,000
Adjustment to Requested increase in electric revenues																																																																																													343,000,000
Recovery request for Operating and Maintenance expenses of AMI Pilot Program																																																																																									40,000,000
Requested increase in gas revenues																																																																																																																																																																																																																																																													32,000,000		30,000,000
Requested rate of return on common equity																																																																																									11.50%																																																																																																																																																																				9.75%
Rate of return on common equity electric distribution																																																																																							10.30%		10.50%
Rate of return on common equity gas distribution																																																																																																																																																																																																																																																													9.60%
Increase in electric delivery service revenue resulting from rate case settlement or order.																																																																																									143,000,000																																																																																							225,000,000																																																																																	34,000,000
Increase in gas delivery service revenue resulting from rate case settlement or order.																																																																																																																																																																																20,000,000																																																																																	12,000,000
Regulatory Assets Transfer Changes			17,000,000																																																																																						11,000,000																																																																																																																																																																										8,000,000
Regulatory Assets Prior Period Transfer Changes																																																																																																																																																																																																																																																																			6,000,000
Severance Recovered Through Distribution Rates																																																																																																																																																																																																																																																																	20,000,000
ComEd's proposed increase to net distribution revenue requirement related to uncollectable account expense																																																																																									22,000,000
Electric Distribution Tax Repairs Refund																																																																																																																																																																											171,000,000
Requested Rate Of Return Common Equity Electric Distribution																																																																																																																																																																																																																																																														83	10.50
Requested Rate Of Return Common Equity Gas Distribution																																																																																																																																																																																																																																																														24	10.35
Appeal of 2007 Illinois Electric Distribution Rate Case [Abstract]
Increase in electric delivery service revenue requirement resulting from regulatory order in rate case		274,000,000
Estimated Refund Obligation To Customers																																																																																									37,000,000
Utility Consolidated Billing and Purchase of Receivables [Abstract]
Purchased AR associated with PORCB																																																																																									105,000,000
Illinois Procurement Proceedings [Abstract]
Near zero emissions coal-fueled generation plant			166
Illinois Legislation for Recovery of Uncollectible Accounts [Abstract]
Under-collected uncollectible accounts regulatory asset																																																																																									70,000,000
One-time operating and maintenance expense charge																																																																																									10,000,000
Annual Transmission Formula Rate Update [Abstract]
Gross transmission revenue requirement																																																																																									488,000,000		450,000,000																																																																																																																																																																						158,000,000		156,000,000
Transmission revenue true up																																																																																									25,000,000		5,000,000																																																																																																																																																																						1,000,000		2,000,000
Net transmission revenue requirement																																																																																									513,000,000		445,000,000																																																																																																																																																																						157,000,000		158,000,000
PJM Transmission Rate Design And Operating Agreements Abstract
Total construction commitments																																																																																(486,000,000)																																																																																																																																																																											(133,000,000)																																																																																			(400,000,000)
Construction commitments due in next twelve months																																																																																(134,000,000)																																																																																																																																																																											(32,000,000)																																																																																			(42,000,000)
Construction commitments due in second year																																																																																(173,000,000)																																																																																																																																																																											(29,000,000)																																																																																			(83,000,000)
Construction commitments due in third year																																																																																(177,000,000)																																																																																																																																																																											(40,000,000)																																																																																			(95,000,000)
Construction commitments due in fourth year																																																																																(2,000,000)																																																																																																																																																																											(24,000,000)																																																																																			(87,000,000)
Construction commitments due in five year																																																																																0																																																																																																																																																																											(8,000,000)																																																																																			(93,000,000)
Smart Meter and Smart Grid Investments [Abstract]
Estimated number of smart meters to be installed																																																																																																																																																																											600,000																																																																																						2,000,000
Expected number of smart meters to be deployed during the first phase of Smart Meter Installment Plan																																																																																																																																																																											1,600,000
Revised spend on its Smart Meter Procurement and Installation Plan																																																																																																																																																																											595,000,000
Spend on smart grid investments																																																																																																																																																																											120,000,000
Smart meter spend to date																																																																																																																																																																											423,000,000
Smart grid infrastructure spend to date																																																																																																																																																																											116,000,000
Total smart grid and smart meter investment grant amount																																																																																																																																																																											200,000,000																																																																																						200,000,000
Smart meter investment grant awarded																																																																																																																																																																											140,000,000
Smart grid investment grant awarded																																																																																																																																																																											60,000,000
Reimbursements received from the DOE																																																																																																																																																																											190,000,000																																																																																						200,000,000
Outstanding reimbursable DOE Smart Grid Investment Grant expenditures																																																																																																																																																																											3,000,000
Regulatory assets for original smart meters purchased																																																																																																																																																																											17,000,000
Carrying value of originally installed Smart Meters, net of reimbursements from DOE																																																																																																																																																																											17,000,000
VendorRefund																																																																																																																																																																											7,000,000
Amount of reimbursements received from the DOE applied to the originally installed Smart Meters.																																																																																																																																																																											16,000,000
Total Projected smart meter smart grid spend																																																																																																																																																																																																																																																																	480,000,000
Current Year AMI Events Balance																																																																																																																																																																											5,000,000
Depreciation Related To Original Meters																																																																																																																																																																											2,000,000
Smart Grid Incremental Cost																																																																																																																																																																																																																																																																	66,000,000		31,000,000
Energy Efficiency Program [Abstract]
Maximum civil penalty under Act 129																																																																																																																																																																																																																																																												20,000,000
Cumulative Consumption Reduction Targets																																																																																																																																																																																																																																																												1125852.00%
Consumption reduction target (as a percentage) mandated by the Energy Efficiency Program - Phase II Implemtation Order for programs directed towards the Utility's low income sector.																																																																																									0.10%																																																																																																																																																																			4.50%
Consumption reduction targets for public sector under Act 129 Phase II Implementation Order																																																																																																																																																																																																																																																												10.00%
Total approved amount under phase II of Act 129 as percent of total annual revenue																																																																																																																																																																																																																																																												2.00%
Renewable energy resources that will cumulatively increase																																																																																																																																																																						10.00%	25.00%
Advanced metering infrastructure pilot program [Abstract]
Collections Under Rider Amp																																																																																											24,000,000
RegulatoryAssetsUnderRiderAmp																																																																																									400,000
Alternative Energy Portfolio Standards [Abstract]
Percentage Tier I alternative energy resources																																																																																																																																																																																																																																																									3.50%	8.00%
Percentage Tier II alternative energy resources																																																																																																																																																																																																																																																									6.20%	10.00%
Total alternative energy credits purchased annually																																																																																																																																																																											452,000
Solar tier 1 alternative energy credits purchased annually																																																																																																																																																																											8,000
Natural Gas Distribution Rate Case [Abstract]
Gas Distribution Tax Repairs Refund																																																																																																																																																																										54,000,000
Authorized Return On Rate Base [Abstract]
Weighted Average Debt And Equity Return	0.0694%																																																																																					0.0754%			8.70%		8.91%																																																																																																																																																																						8.35%		8.43%
Rate Of Return On Common Equity																																																																																					0.0872%	0.0981%			11.50%																																																																																																																																																																								11.30%
Rate Of Return On Common Equity in FERC Complaint																																																																																																																																																																																																																																																																	8.70%
Common Equity Component Cap																																																																																									55.00%
Base Rate Of Return On Common Equity																																																																																																																																																																																																																																																																	10.80%
ReductionInRevenuefromProposedRate																																																																																																																																																																																																																																																																	10,000,000
Basis Points On Rate Of Return For PJM Membership																																																																																																																																																																																																																																																																	50
Regulatory Assets And Liabilities Other Disclosures [Abstract]
Pension and other postretirement benefit regulatory asset held at parent company			3,015,000,000
Over under recovered transmission costs																																																																																																																																																																											8,000,000		1,000,000
Over under recovered electric supply costs																																																																																																																																																																											34,000,000		47,000,000																																																																																				(1,000,000)		(19,000,000)
Over under recovered gas supply costs																																																																																																																																																																											16,000,000		1,000,000																																																																																				(11,000,000)		(9,000,000)
Amortization of rate stabilization deferral			66,000,000		57,000,000																																																																																																																																																																																																																																																												66,000,000		67,000,000		57,000,000
Total cost of smart grid pilot program																																																																																																																																																																																																																																																																	11,000,000
Rate relief for clean-up costs and received																																																																																																																																																																																																																																																																																																																																															1,000,000	5,000,000
Portion of electric generation-related regulatory asset representing income taxes recoverable that do not earn a regulated rate of return																																																																																																																																																																																																																																																																	37,000,000		47,000,000
Rate cap for BGE residential electric customers from July 1, 2006 until May 31, 2007 (as a percent)																																																																																																																																																																																																																																																																	15.00%
Deferred expense related to electricity purchased for resale																																																																																																																																																																																																																																																																	306,000,000
Recovered portion of regulatory assets			212,000,000		129,000,000		63,000,000																																																																										0	0	0						119,000,000		80,000,000		52,000,000																																																																														9,000,000		10,000,000		11,000,000																																																																																		84,000,000		53,000,000		50,000,000
Equity Ratio Minimum After Dividend Payments																																																																																																																																																																																																																																																																	48.00%
Deferred Merger Costs																																																																																																																																																																																																																																																																4,000,000	8,000,000
Over Under Gas Decoupling Regulatory Asset																																																																																																																																																																																																																																																																	9,000,000		7,000,000
Over Under Electric Decoupling Regulatory Asset																																																																																																																																																																																																																																																																	7,000,000		5,000,000
Maryland Electric And Natural Gas Distribution Rate Cases [Abstract]
Deferral of total costs																																																																																																																																																																																																																																																																	19,000,000
Deferral of storm costs																																																																																																																																																																																																																																																																	16,000,000				(16,000,000)
License Renewals [Abstract]
Ownership interest																																																																																				42.59%
Minimum Purchase Obligation																																																																																	20,000,000
Maximum Purchase Obligation																																																																																	30,000,000
Regulatory Asset [Line Items]
Noncurrent regulatory assets			5,910,000,000		6,497,000,000																														2,794,000,000	3,673,000,000	1,459,000,000	1,382,000,000	159,000,000	70,000,000	5,000,000	17,000,000	285,000,000	191,000,000	56,000,000	68,000,000	219,000,000	256,000,000	0	12,000,000	12,000,000	28,000,000	102,000,000	90,000,000	212,000,000	232,000,000	0	2,000,000	0	48,000,000	0	176,000,000	49,000,000	0	0	3,000,000	2,000,000	3,000,000	6,000,000	30,000,000	40,000,000	154,000,000	225,000,000	148,000,000	126,000,000	0	9,000,000	39,000,000	25,000,000										933,000,000		666,000,000																														0	0	65,000,000	62,000,000	35,000,000	10,000,000	0	0	285,000,000	191,000,000	53,000,000	62,000,000	0	0	0	0	0	12,000,000	67,000,000	65,000,000	178,000,000	197,000,000	0	2,000,000	0	48,000,000	0	176,000,000	49,000,000	0	0	0	0	0	0	0	0	0	0	0	0	0		26,000,000	16,000,000						1,448,000,000		1,378,000,000																															0	0	1,317,000,000	1,255,000,000	58,000,000	29,000,000	5,000,000	17,000,000	0	0	3,000,000	6,000,000	0	0	0	0	0	0	25,000,000	25,000,000	33,000,000	33,000,000	0	0	0	0	0	0	0	0	0	3,000,000	2,000,000	0	0	0	0	0	0	0	0	0	0	7,000,000	8,000,000									524,000,000		522,000,000																														0	0	77,000,000	65,000,000	66,000,000	31,000,000	0	0	0	0	8,000,000	9,000,000	0	0	0	0	12,000,000	16,000,000	10,000,000	0	1,000,000	2,000,000	0	0	0	0	0	0	0	0	0	0	0	3,000,000	6,000,000	30,000,000	40,000,000	154,000,000	225,000,000	148,000,000	126,000,000	0	9,000,000	6,000,000	2,000,000
Current regulatory assets			760,000,000		764,000,000																														221,000,000	304,000,000	10,000,000	14,000,000	5,000,000	3,000,000	0	0	178,000,000	18,000,000	12,000,000	14,000,000	0	0	12,000,000	77,000,000	16,000,000	29,000,000	1,000,000	0	40,000,000	58,000,000	2,000,000	3,000,000	11,000,000	0	0	17,000,000	18,000,000	53,000,000	43,000,000	1,000,000	1,000,000	3,000,000	3,000,000	13,000,000	16,000,000	71,000,000	67,000,000	73,000,000	56,000,000	5,000,000	2,000,000	31,000,000	23,000,000										329,000,000		388,000,000																														0	0	2,000,000	5,000,000	5,000,000	3,000,000	0	0	178,000,000	18,000,000	9,000,000	11,000,000	0	0	0	0	12,000,000	25,000,000	1,000,000	0	33,000,000	51,000,000	2,000,000	3,000,000	0	0	226,000,000	17,000,000	18,000,000	52,000,000	14,000,000	0	0	0	0	0	0	0	0	0	0	0		18,000,000	14,000,000						17,000,000		32,000,000																															0	0	0	0	0	0	0	0	0	0	3,000,000	3,000,000	0	0	0	0	0	0	0	0	6,000,000	6,000,000	0	0	11,000,000	0	0	0	0	0	1,000,000	1,000,000	1,000,000	0	0	0	0	0	0	0	0	0	0	8,000,000	9,000,000									181,000,000		190,000,000																														0	0	8,000,000	9,000,000	0	0	0	0	0	0	1,000,000	1,000,000	0	0	0	0	4,000,000	4,000,000	0	0	1,000,000	1,000,000	0	0	0	0	0	0	0	1,000,000	28,000,000	0	0	3,000,000	3,000,000	13,000,000	16,000,000	71,000,000	67,000,000	73,000,000	56,000,000	5,000,000	2,000,000	4,000,000	0
Net regulatory asset																																																																																																																																											463,000,000	209,000,000
Regulatory Liabilities [Line Items]
Regulatory Liability Current			327,000,000		368,000,000			0	0	99,000,000	97,000,000	53,000,000	131,000,000	20,000,000	20,000,000	0	0	6,000,000	78,000,000	54,000,000	8,000,000	3,000,000	2,000,000	38,000,000	40,000,000	16,000,000	7,000,000	8,000,000	8,000,000	4,000,000	0	1,000,000	0	2,000,000																																																							170,000,000		170,000,000			0	0	78,000,000	75,000,000	45,000,000	43,000,000	0	0	0	0	6,000,000	9,000,000	6,000,000	0	0	0	38,000,000	40,000,000	0	0	0	0	0	0	0	0	0																																																			106,000,000		169,000,000				0	0	0	0	8,000,000	88,000,000	20,000,000	20,000,000	0	0	0	58,000,000	48,000,000	8,000,000	3,000,000	2,000,000	0	0	0	0	8,000,000	8,000,000	3,000,000	0	1,000,000	0	0																																																						48,000,000		29,000,000			0	0	21,000,000	22,000,000	0	0	0	0	0	0	0	11,000,000	0	0	0	0	0	0	16,000,000	7,000,000	0	0	0	0	0	0	0
Noncurrent regulatory liabilities			$ 4,388,000,000		$ 3,981,000,000			$ 2,740,000,000	$ 2,397,000,000	$ 1,423,000,000	$ 1,406,000,000	$ 0	$ 0	$ 114,000,000	$ 132,000,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 37,000,000	$ 46,000,000	$ 0	$ 0	$ 10,000,000	$ 21,000,000	$ 43,000,000																																																							$ 3,512,000,000		$ 3,229,000,000			$ 2,293,000,000	$ 2,037,000,000	$ 1,219,000,000	$ 1,192,000,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0																																																			$ 629,000,000		$ 538,000,000				$ 447,000,000	$ 360,000,000	$ 0	$ 0	$ 0	$ 0	$ 114,000,000	$ 132,000,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 37,000,000	$ 46,000,000	$ 0	$ 0	$ 10,000,000	$ 21,000,000	$ 0																																																						$ 204,000,000		$ 214,000,000			$ 0	$ 0	$ 204,000,000	$ 214,000,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

[1] PECO's gas POR program became effective on January 1, 2012 and includes a 1% discount on purchased receivables in order to recover the implementation costs of the program. If the costs are not fully recovered when PECO files its next gas distribution rate case, PECO will propose a mechanism to recover the remaining implementation costs as a distribution charge to low volume transportation customers or apply future discounts on purchased receivables from natural gas suppliers serving those customers.

[2] For ComEd and BGE, reflects the incremental allowance for uncollectible accounts recorded, which is in addition to the purchase discount. For ComEd, the incremental uncollectible accounts expense is recovered through its Purchase of Receivables with Consolidated Billing (PORCB) tariff.