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Related Party Transactions (Details) (USD $)
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Edison Mission Operation and Maintenance, Inc
Dec. 31, 2013
Southern California Edison Company
Dec. 31, 2013
Administrative Services Agreements
Dec. 31, 2012
Administrative Services Agreements
Dec. 31, 2013
Administrative Services Agreements
Edison International
Dec. 31, 2012
Administrative Services Agreements
Edison International
Dec. 31, 2011
Administrative Services Agreements
Edison International
Dec. 31, 2013
Operation and Maintenance Agreements
Dec. 31, 2012
Operation and Maintenance Agreements
Dec. 31, 2013
Operation and Maintenance Agreements
Edison Mission Operation and Maintenance, Inc
Dec. 31, 2012
Operation and Maintenance Agreements
Edison Mission Operation and Maintenance, Inc
Dec. 31, 2011
Operation and Maintenance Agreements
Edison Mission Operation and Maintenance, Inc
Dec. 31, 2013
Power Contracts
Dec. 31, 2013
Power Contracts
Southern California Edison Company
Dec. 31, 2012
Power Contracts
Southern California Edison Company
Dec. 31, 2011
Power Contracts
Southern California Edison Company
Dec. 31, 2013
Power Contracts
Walnut Creek
Dec. 31, 2013
Midwest Generation LLC [Member]
Dec. 31, 2012
Midwest Generation LLC [Member]
Dec. 31, 2011
Midwest Generation LLC [Member]
Jul. 02, 2013
Midwest Generation LLC [Member]
Edison Mission Energy
Jan. 02, 2013
Midwest Generation LLC [Member]
Edison Mission Energy
Aug. 24, 2000
Midwest Generation LLC [Member]
Edison Mission Energy
notes_pledged
Dec. 31, 2013
Midwest Generation LLC [Member]
Administrative Services Agreements
Dec. 31, 2012
Midwest Generation LLC [Member]
Administrative Services Agreements
Dec. 31, 2013
Midwest Generation LLC [Member]
Administrative Services Agreements
Edison International
Dec. 31, 2012
Midwest Generation LLC [Member]
Administrative Services Agreements
Edison International
Dec. 31, 2011
Midwest Generation LLC [Member]
Administrative Services Agreements
Edison International
Dec. 31, 2013
Midwest Generation LLC [Member]
Master Purchase, Sale and Services Agreement
Dec. 31, 2012
Midwest Generation LLC [Member]
Master Purchase, Sale and Services Agreement
Dec. 31, 2013
Midwest Generation LLC [Member]
Master Purchase, Sale and Services Agreement
Edison Mission Marketing and Trading, Inc
Dec. 31, 2012
Midwest Generation LLC [Member]
Master Purchase, Sale and Services Agreement
Edison Mission Marketing and Trading, Inc
Dec. 31, 2011
Midwest Generation LLC [Member]
Master Purchase, Sale and Services Agreement
Edison Mission Marketing and Trading, Inc
Dec. 31, 2013
Midwest Generation LLC [Member]
Notes Receivable
Edison Mission Energy
Dec. 31, 2012
Midwest Generation LLC [Member]
Notes Receivable
Edison Mission Energy
Dec. 31, 2011
Midwest Generation LLC [Member]
Notes Receivable
Edison Mission Energy
Dec. 31, 2013
Midwest Generation LLC [Member]
Management and Support Services Agreement
Dec. 31, 2012
Midwest Generation LLC [Member]
Management and Support Services Agreement
Dec. 31, 2013
Midwest Generation LLC [Member]
Management and Support Services Agreement
Midwest Generation EME, LLC [Member]
Dec. 31, 2012
Midwest Generation LLC [Member]
Management and Support Services Agreement
Midwest Generation EME, LLC [Member]
Dec. 31, 2011
Midwest Generation LLC [Member]
Management and Support Services Agreement
Midwest Generation EME, LLC [Member]
Jan. 02, 2014
Subsequent Event
Midwest Generation LLC [Member]
Edison Mission Energy
Related Party Transaction [Line Items]                                                                                        
Ownership percentage     50.00%                                                                                  
Revenues from related parties       $ 84,000,000               $ 25,000,000 $ 24,000,000 $ 23,000,000   $ 297,000,000 $ 233,000,000 $ 277,000,000                                                    
Receivables from affiliates 3,000,000 8,000,000               3,000,000 4,000,000       8,000,000         47,000,000 40,000,000                   47,000,000 39,000,000                        
Number Of Notes Pledged                                                 4                                      
Power sales contract, term of contract                                     10 years                                                  
Proceeds from interco notes                                                 1,367,000,000                                      
Fixed interest rate (percent)                                                 8.30%                                      
Loan Payments Not Received Related Party                                             61,000,000 61,000,000                                       61,000,000
Impairment of loan to affiliate                                       0 1,378,000,000 0                                            
Interest income from related parties                                                                       0 110,000,000 111,000,000            
Expenses, reimbursed to related party             12,000,000 60,000,000 60,000,000                                     17,000,000 27,000,000 30,000,000     1,000,000 1,000,000 1,000,000           29,000,000 23,000,000 24,000,000  
Payables to affiliates 16,000,000 34,000,000     1,000,000 (1,000,000)                           6,000,000 3,000,000         0 1,000,000                       6,000,000 2,000,000        
Payables to affiliates                                       $ 0 $ 0