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Regulatory Matters Regulatory Matters - Schedule of Regulatory Assets (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Regulatory Assets [Line Items]    
Current $ 774 $ 760
Noncurrent 5,589 5,910
DSP Program [Member]
    
Regulatory Assets [Line Items]    
Regulatory Assets 28 34
Other Postretirement Benefits [Member]
    
Regulatory Assets [Line Items]    
Current 208 221
Noncurrent 2,455 2,794
Deferred Income Tax Charge [Member]
    
Regulatory Assets [Line Items]    
Current 7 10
Noncurrent 1,517 1,459
AMI Expenses [Member]
    
Regulatory Assets [Line Items]    
Current 9 5
Noncurrent 254 159
AMI Meter Events [Member]
    
Regulatory Assets [Line Items]    
Current   0
Noncurrent   5
Under Recovered Distribution Service Costs [Member]
    
Regulatory Assets [Line Items]    
Current 243 178
Noncurrent 223 285
Loss on Reacquired Debt [Member]
    
Regulatory Assets [Line Items]    
Current 9 12
Noncurrent 50 56
Fair Value Of Long Term Debt [Member]
    
Regulatory Assets [Line Items]    
Current 6 [1] 0 [1]
Noncurrent 192 [1] 219 [1]
Fair Value Of Supply Contract [Member]
    
Regulatory Assets [Line Items]    
Current 3 [2] 12 [2]
Noncurrent 0 0 [2]
Employee Severance [Member]
    
Regulatory Assets [Line Items]    
Current 4 16
Noncurrent 9 12
Asset Retirement Obligation Costs [Member]
    
Regulatory Assets [Line Items]    
Current 1 1
Noncurrent 111 102
Environmental Restoration Costs [Member]
    
Regulatory Assets [Line Items]    
Current 39 40
Noncurrent 220 212
RTO Startup Costs [Member]
    
Regulatory Assets [Line Items]    
Current 1 2
Noncurrent 0 0
Under Recovered Uncollectible Accounts Expense [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 70 48
Renewable Energy And Associated REC [Member]
    
Regulatory Assets [Line Items]    
Current 14 17
Noncurrent 164 176
Under Recovered Energy And Transmission Costs [Member]
    
Regulatory Assets [Line Items]    
Current 22 53
Noncurrent 5 0
Deferred Storm Costs [Member]
    
Regulatory Assets [Line Items]    
Current 3 3
Noncurrent 0 3
Electric Generation Related Regulatory Asset [Member]
    
Regulatory Assets [Line Items]    
Current 12 13
Noncurrent 21 30
Rate Stabilization Deferral [Member]
    
Regulatory Assets [Line Items]    
Current 75 71
Noncurrent 101 154
Energy Efficiency And Demand Response Programs [Member]
    
Regulatory Assets [Line Items]    
Current 84 73
Noncurrent 151 148
Merger Integration Costs [Member]
    
Regulatory Assets [Line Items]    
Current 2 2
Noncurrent 7 9
ConservativeVoltageReductionProgram [Member]
    
Regulatory Assets [Line Items]    
Current 1  
Noncurrent 1  
Regulatory Assets [Member]
    
Regulatory Assets [Line Items]    
Current 17 31
Noncurrent 38 39
Under Recovered Decoupling Revenue [Member]
    
Regulatory Assets [Line Items]    
Current 14 [3]  
Noncurrent 0  
Over-Recovered Natural Gas Costs [Member]
    
Regulatory Assets [Line Items]    
Regulatory Assets 11 8
Over Recovered Electric Energy And Transmission Costs [Member]
    
Regulatory Assets [Line Items]    
Regulatory Assets 5 16
Commonwealth Edison Co [Member]
    
Regulatory Assets [Line Items]    
Current 330 329
Noncurrent 928 933
Commonwealth Edison Co [Member] | Other Postretirement Benefits [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
Commonwealth Edison Co [Member] | Deferred Income Tax Charge [Member]
    
Regulatory Assets [Line Items]    
Current 1 2
Noncurrent 67 65
Commonwealth Edison Co [Member] | AMI Expenses [Member]
    
Regulatory Assets [Line Items]    
Current 9 5
Noncurrent 69 35
Commonwealth Edison Co [Member] | AMI Meter Events [Member]
    
Regulatory Assets [Line Items]    
Current   0
Noncurrent   0
Commonwealth Edison Co [Member] | Under Recovered Distribution Service Costs [Member]
    
Regulatory Assets [Line Items]    
Current 243 178
Noncurrent 223 285
Commonwealth Edison Co [Member] | Loss on Reacquired Debt [Member]
    
Regulatory Assets [Line Items]    
Current 7 9
Noncurrent 48 53
Commonwealth Edison Co [Member] | Fair Value Of Long Term Debt [Member]
    
Regulatory Assets [Line Items]    
Current 0 0 [1]
Noncurrent 0 0 [1]
Commonwealth Edison Co [Member] | Fair Value Of Supply Contract [Member]
    
Regulatory Assets [Line Items]    
Current 0 0 [2]
Noncurrent 0 0 [2]
Commonwealth Edison Co [Member] | Employee Severance [Member]
    
Regulatory Assets [Line Items]    
Current 0 12
Noncurrent 0 0
Commonwealth Edison Co [Member] | Asset Retirement Obligation Costs [Member]
    
Regulatory Assets [Line Items]    
Current 1 1
Noncurrent 73 67
Commonwealth Edison Co [Member] | Environmental Restoration Costs [Member]
    
Regulatory Assets [Line Items]    
Current 32 33
Noncurrent 186 178
Commonwealth Edison Co [Member] | RTO Startup Costs [Member]
    
Regulatory Assets [Line Items]    
Current 1 2
Noncurrent 0 0
Commonwealth Edison Co [Member] | Under Recovered Uncollectible Accounts Expense [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 70 48
Commonwealth Edison Co [Member] | Renewable Energy And Associated REC [Member]
    
Regulatory Assets [Line Items]    
Current 14 17
Noncurrent 164 176
Commonwealth Edison Co [Member] | Under Recovered Energy And Transmission Costs [Member]
    
Regulatory Assets [Line Items]    
Current 19 52
Noncurrent 0 0
Commonwealth Edison Co [Member] | Deferred Storm Costs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
Commonwealth Edison Co [Member] | Electric Generation Related Regulatory Asset [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
Commonwealth Edison Co [Member] | Rate Stabilization Deferral [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
Commonwealth Edison Co [Member] | Energy Efficiency And Demand Response Programs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
Commonwealth Edison Co [Member] | Merger Integration Costs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
Commonwealth Edison Co [Member] | ConservativeVoltageReductionProgram [Member]
    
Regulatory Assets [Line Items]    
Current 0  
Noncurrent 0  
Commonwealth Edison Co [Member] | Regulatory Assets [Member]
    
Regulatory Assets [Line Items]    
Current 3 18
Noncurrent 28 26
Commonwealth Edison Co [Member] | Under Recovered Decoupling Revenue [Member]
    
Regulatory Assets [Line Items]    
Current 0  
Noncurrent 0  
PECO Energy Co [Member]
    
Regulatory Assets [Line Items]    
Current 21 17
Noncurrent 1,520 1,448
PECO Energy Co [Member] | Other Postretirement Benefits [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
PECO Energy Co [Member] | Deferred Income Tax Charge [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 1,377 1,317
PECO Energy Co [Member] | AMI Expenses [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 74 58
PECO Energy Co [Member] | AMI Meter Events [Member]
    
Regulatory Assets [Line Items]    
Current   0
Noncurrent   5
PECO Energy Co [Member] | Under Recovered Distribution Service Costs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
PECO Energy Co [Member] | Loss on Reacquired Debt [Member]
    
Regulatory Assets [Line Items]    
Current 2 3
Noncurrent 2 3
PECO Energy Co [Member] | Fair Value Of Long Term Debt [Member]
    
Regulatory Assets [Line Items]    
Current 0 0 [1]
Noncurrent 0 0 [1]
PECO Energy Co [Member] | Fair Value Of Supply Contract [Member]
    
Regulatory Assets [Line Items]    
Current 0 0 [2]
Noncurrent 0 0 [2]
PECO Energy Co [Member] | Employee Severance [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
PECO Energy Co [Member] | Asset Retirement Obligation Costs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 26 25
PECO Energy Co [Member] | Environmental Restoration Costs [Member]
    
Regulatory Assets [Line Items]    
Current 6 6
Noncurrent 33 33
PECO Energy Co [Member] | RTO Startup Costs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
PECO Energy Co [Member] | Under Recovered Uncollectible Accounts Expense [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
PECO Energy Co [Member] | Renewable Energy And Associated REC [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
PECO Energy Co [Member] | Under Recovered Energy And Transmission Costs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
PECO Energy Co [Member] | Deferred Storm Costs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
PECO Energy Co [Member] | Electric Generation Related Regulatory Asset [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
PECO Energy Co [Member] | Rate Stabilization Deferral [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
PECO Energy Co [Member] | Energy Efficiency And Demand Response Programs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
PECO Energy Co [Member] | Merger Integration Costs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
PECO Energy Co [Member] | ConservativeVoltageReductionProgram [Member]
    
Regulatory Assets [Line Items]    
Current 0  
Noncurrent 0  
PECO Energy Co [Member] | Regulatory Assets [Member]
    
Regulatory Assets [Line Items]    
Current 13 8
Noncurrent 8 7
PECO Energy Co [Member] | Under Recovered Decoupling Revenue [Member]
    
Regulatory Assets [Line Items]    
Current 0  
Noncurrent 0  
Baltimore Gas and Electric Company [Member]
    
Regulatory Assets [Line Items]    
Current 206 181
Noncurrent 500 524
Baltimore Gas and Electric Company [Member] | Other Postretirement Benefits [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
Baltimore Gas and Electric Company [Member] | Deferred Income Tax Charge [Member]
    
Regulatory Assets [Line Items]    
Current 6 8
Noncurrent 73 77
Baltimore Gas and Electric Company [Member] | AMI Expenses [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 111 66
Baltimore Gas and Electric Company [Member] | AMI Meter Events [Member]
    
Regulatory Assets [Line Items]    
Current   0
Noncurrent   0
Baltimore Gas and Electric Company [Member] | Under Recovered Distribution Service Costs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
Baltimore Gas and Electric Company [Member] | Loss on Reacquired Debt [Member]
    
Regulatory Assets [Line Items]    
Current 1 1
Noncurrent 8 8
Baltimore Gas and Electric Company [Member] | Fair Value Of Long Term Debt [Member]
    
Regulatory Assets [Line Items]    
Current 0 0 [1]
Noncurrent 0 0 [1]
Baltimore Gas and Electric Company [Member] | Fair Value Of Supply Contract [Member]
    
Regulatory Assets [Line Items]    
Current 0 0 [2]
Noncurrent 0 0 [2]
Baltimore Gas and Electric Company [Member] | Employee Severance [Member]
    
Regulatory Assets [Line Items]    
Current 4 4
Noncurrent 9 12
Baltimore Gas and Electric Company [Member] | Asset Retirement Obligation Costs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 12 10
Baltimore Gas and Electric Company [Member] | Environmental Restoration Costs [Member]
    
Regulatory Assets [Line Items]    
Current 1 1
Noncurrent 1 1
Baltimore Gas and Electric Company [Member] | RTO Startup Costs [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
Baltimore Gas and Electric Company [Member] | Under Recovered Uncollectible Accounts Expense [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
Baltimore Gas and Electric Company [Member] | Renewable Energy And Associated REC [Member]
    
Regulatory Assets [Line Items]    
Current 0 0
Noncurrent 0 0
Baltimore Gas and Electric Company [Member] | Under Recovered Energy And Transmission Costs [Member]
    
Regulatory Assets [Line Items]    
Current 3 [4] 1 [4]
Noncurrent 5 0
Baltimore Gas and Electric Company [Member] | Deferred Storm Costs [Member]
    
Regulatory Assets [Line Items]    
Current 3 3
Noncurrent 0 3
Baltimore Gas and Electric Company [Member] | Electric Generation Related Regulatory Asset [Member]
    
Regulatory Assets [Line Items]    
Current 12 13
Noncurrent 21 30
Baltimore Gas and Electric Company [Member] | Rate Stabilization Deferral [Member]
    
Regulatory Assets [Line Items]    
Current 75 71
Noncurrent 101 154
Baltimore Gas and Electric Company [Member] | Energy Efficiency And Demand Response Programs [Member]
    
Regulatory Assets [Line Items]    
Current 84 73
Noncurrent 151 148
Baltimore Gas and Electric Company [Member] | Merger Integration Costs [Member]
    
Regulatory Assets [Line Items]    
Current 2 2
Noncurrent 7 9
Baltimore Gas and Electric Company [Member] | ConservativeVoltageReductionProgram [Member]
    
Regulatory Assets [Line Items]    
Current 1  
Noncurrent 1  
Baltimore Gas and Electric Company [Member] | Regulatory Assets [Member]
    
Regulatory Assets [Line Items]    
Current 0 4
Noncurrent 0 6
Baltimore Gas and Electric Company [Member] | Under Recovered Decoupling Revenue [Member]
    
Regulatory Assets [Line Items]    
Current 14 [3]  
Noncurrent 0  
Baltimore Gas and Electric Company [Member] | Under-Recovered Electric Revenue Decoupling [Member]
    
Regulatory Assets [Line Items]    
Regulatory Assets $ 14  
[1] Represents the regulatory asset recorded at Exelon Corporate for the difference in the fair value of the long-term debt of BGE as of the merger date. The asset is amortized over the life of the underlying debt.
[2] Represents the regulatory asset recorded at Exelon Corporate representing the fair value of BGE’s supply contracts as of the close of the merger date. BGE is allowed full recovery of the costs of its electric and gas supply contracts through approved, regulated rates. The asset is amortized over a period of approximately 3 years.
[3] Represents the electric and gas distribution costs recoverable from customers under BGE’s decoupling mechanism. As of September 30, 2014, BGE had a regulatory asset of $14 million related to under-recovered electric revenue decoupling and a regulatory liability of $16 million related to over-recovered natural gas revenue decoupling. As of December 31, 2013, BGE had a regulatory liability of $7 million related to over-recovered electric revenue decoupling and $9 million related to over-recovered natural gas revenue decoupling.
[4] Relates to $3 million associated with the transmission formula rate and $3 million of over-recovered natural gas supply costs as of September 30, 2014. As of December 31, 2013, includes $1 million of under-recovered electric supply costs and $11 million of over-recovered natural gas supply costs.