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Derivative Instruments and Hedging Activities (Notional Values) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Edison Mission Energy | Interest Rate Contracts
    
Derivatives    
Notional Amount of Interest Rate Derivatives $ 727 $ 644
Derivative, Lower Variable Interest Rate Range 0.79% 0.79%
Derivative, Higher Variable Interest Rate Range 4.29% 4.29%
Edison Mission Energy | Foward Starting Interest Rate Contracts
    
Derivatives    
Notional Amount of Interest Rate Derivatives $ 641 $ 506
Derivative, Lower Variable Interest Rate Range 0.7825%  
Derivative, Higher Variable Interest Rate Range 4.0025%  
Edison Mission Energy | Foward Starting Interest Rate Contracts | Convert Floating Rate Debt to Fixed 3.5429% Debt [Member]
    
Derivatives    
Derivative, Lower Variable Interest Rate Range   3.5429%
Edison Mission Energy | Foward Starting Interest Rate Contracts | Convert Floating Rate Debt to Fixed 3.57% Debt [Member]
    
Derivatives    
Derivative, Higher Variable Interest Rate Range   3.57%
Edison Mission Energy | Foward Starting Interest Rate Contracts | Convert Floating Rate Debt to Fixed 4.0025% Debt [Member]
    
Derivatives    
Derivative, Higher Variable Interest Rate Range   4.0025%
Electric Utility | Electricity options, swaps and forwards (GWh) | Economic hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 18,304.0 30,881.0
Electric Utility | Natural gas options, swaps and forwards (bcf) | Economic hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 142.0 300.0
Electric Utility | Congestion revenue rights (GWh) | Economic hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 140,263.0 166,163.0
Electric Utility | Tolling arrangements (GWh) | Economic hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 102,123.0 104,154.0
Competitive Power Generation | Electricity Forwards/Futures, Sales (GWh) | Cash flow hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 5,644.0 8,320.0
Competitive Power Generation | Electricity Forwards/Futures, Sales (GWh) | Economic hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 58 [1] 335.0 [1]
Competitive Power Generation | Electricity Forwards/Futures, Sales (GWh) | Trading activities
    
Derivatives    
Notional Volumes of Derivative Instruments 0 0
Competitive Power Generation | Electricity Forwards/Futures, Purchases (GWh) | Cash flow hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 0 0
Competitive Power Generation | Electricity Forwards/Futures, Purchases (GWh) | Economic hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 0 0
Competitive Power Generation | Electricity Forwards/Futures, Purchases (GWh) | Trading activities
    
Derivatives    
Notional Volumes of Derivative Instruments 550.0 2,926.0
Competitive Power Generation | Electricity Capacity, Sales (GW-Day) | Cash flow hedges
    
Derivatives    
Notional Volumes of Derivative Instruments   61 [2]
Competitive Power Generation | Electricity Capacity, Sales (GW-Day) | Economic hedges
    
Derivatives    
Notional Volumes of Derivative Instruments   0
Competitive Power Generation | Electricity Capacity, Sales (GW-Day) | Trading activities
    
Derivatives    
Notional Volumes of Derivative Instruments   0
Competitive Power Generation | Electricity Capacity, Purchases (GW-Day) | Cash flow hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 0 0
Competitive Power Generation | Electricity Capacity, Purchases (GW-Day) | Economic hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 0 0
Competitive Power Generation | Electricity Capacity, Purchases (GW-Day) | Trading activities
    
Derivatives    
Notional Volumes of Derivative Instruments 97 [2] 184.0 [2]
Competitive Power Generation | Electricity Congestion, Purchases (GWh) | Cash flow hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 0 0
Competitive Power Generation | Electricity Congestion, Purchases (GWh) | Economic hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 241.0 [3] 1,261.0 [3]
Competitive Power Generation | Electricity Congestion, Purchases (GWh) | Trading activities
    
Derivatives    
Notional Volumes of Derivative Instruments 281,251.0 [3] 230,798.0 [3]
Competitive Power Generation | Natural Gas Forwards/Futures, Sales (bcf) | Cash flow hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 0 0
Competitive Power Generation | Natural Gas Forwards/Futures, Sales (bcf) | Economic hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 0 0
Competitive Power Generation | Natural Gas Forwards/Futures, Sales (bcf) | Trading activities
    
Derivatives    
Notional Volumes of Derivative Instruments 0.4 0.2
Competitive Power Generation | Fuel Oil Forwards/Futures, Sales (barrels) | Cash flow hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 0  
Competitive Power Generation | Fuel Oil Forwards/Futures, Sales (barrels) | Economic hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 0  
Competitive Power Generation | Fuel Oil Forwards/Futures, Sales (barrels) | Trading activities
    
Derivatives    
Notional Volumes of Derivative Instruments 100,000.0  
Competitive Power Generation | Fuel Oil Forwards/Futures, Purchases (barrels) | Cash flow hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 0 0
Competitive Power Generation | Fuel Oil Forwards/Futures, Purchases (barrels) | Economic hedges
    
Derivatives    
Notional Volumes of Derivative Instruments 120,000.0 240,000.0
Competitive Power Generation | Fuel Oil Forwards/Futures, Purchases (barrels) | Trading activities
    
Derivatives    
Notional Volumes of Derivative Instruments 0 0
[1] These positions adjust financial and physical positions, or day-ahead and real-time positions, to reduce costs or increase gross margin. The net sales positions of these categories are primarily related to hedge transactions that are not designated as cash flow hedges.
[2] EME's hedge transactions for capacity result from bilateral trades. Capacity sold in the PJM Interconnection, LLC Reliability Pricing Model (PJM RPM) auction is not accounted for as a derivative.
[3] Congestion contracts include financial transmission rights, transmission congestion contracts or congestion revenue rights. These positions are similar to a swap, where the buyer is entitled to receive a stream of revenues (or charges) based on the hourly day-ahead price differences between two locations.