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Fair Value Measurements (Recurring Fair Value Measurements) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Assets at Fair Value          
Money market funds $ 856 [1]   $ 856 [1]   $ 615 [1]
Derivative contracts 63   63   90
Total assets 919   919   705
Liabilities at Fair Value          
Total liabilities 68   68   118
Midwest Generation LLC
         
Assets at Fair Value          
Money market funds 99 [2]   99 [2]   75 [2]
Total assets 100   100   77
Liabilities at Fair Value          
Total liabilities 5   5   3
Electricity
         
Assets at Fair Value          
Derivative contracts 63   63   90
Liabilities at Fair Value          
Derivative contracts 0   0   0
Electricity | Midwest Generation LLC
         
Assets at Fair Value          
Derivative contracts 1   1   2
Liabilities at Fair Value          
Derivative contracts 5   5   3
Natural gas
         
Assets at Fair Value          
Derivative contracts 0   0   0
Liabilities at Fair Value          
Derivative contracts         0
Interest rate
         
Liabilities at Fair Value          
Derivative contracts 68   68   118
Level 1
         
Assets at Fair Value          
Money market funds 856 [1]   856 [1]   615 [1]
Total assets 857   857   615
Liabilities at Fair Value          
Total liabilities 0   0   3
Level 1 | Midwest Generation LLC
         
Assets at Fair Value          
Money market funds 99 [2]   99 [2]   75 [2]
Total assets 99   99   75
Liabilities at Fair Value          
Total liabilities 0   0   0
Level 1 | Electricity
         
Assets at Fair Value          
Derivative contracts 0   0   0
Liabilities at Fair Value          
Derivative contracts 0   0   0
Level 1 | Electricity | Midwest Generation LLC
         
Assets at Fair Value          
Derivative contracts 0   0   0
Liabilities at Fair Value          
Derivative contracts 0   0   0
Level 1 | Natural gas
         
Assets at Fair Value          
Derivative contracts 1   1    
Liabilities at Fair Value          
Derivative contracts         3
Level 1 | Interest rate
         
Liabilities at Fair Value          
Derivative contracts 0   0   0
Level 2
         
Assets at Fair Value          
Money market funds 0 [1]   0 [1]   0 [1]
Total assets 41   41   41
Liabilities at Fair Value          
Total liabilities 73   73   124
Level 2 | Midwest Generation LLC
         
Assets at Fair Value          
Money market funds 0 [2]   0 [2]   0 [2]
Total assets 1   1   2
Liabilities at Fair Value          
Total liabilities 5   5   3
Level 2 | Electricity
         
Assets at Fair Value          
Derivative contracts 41   41   41
Liabilities at Fair Value          
Derivative contracts 5   5   6
Level 2 | Electricity | Midwest Generation LLC
         
Assets at Fair Value          
Derivative contracts 1   1   2
Liabilities at Fair Value          
Derivative contracts 5   5   3
Level 2 | Natural gas
         
Assets at Fair Value          
Derivative contracts 0   0    
Liabilities at Fair Value          
Derivative contracts         0
Level 2 | Interest rate
         
Liabilities at Fair Value          
Derivative contracts 68   68   118
Level 3
         
Assets at Fair Value          
Money market funds 0 [1]   0 [1]   0 [1]
Total assets 32   32   52
Liabilities at Fair Value          
Total liabilities 6   6   1
Fair Value Disclosures Level 3 [Roll Forward]          
Fair value of net assets at beginning of period 41 24 51 83  
Total realized/unrealized gains (losses)          
Included in earnings (25) [3] 23 [3] (19) [3] 8 [3]  
Included in AOCI 0 [4] 0 [4] 0 [4] 2 [4]  
Purchases 10 13 19 19  
Settlements 0 (19) (25) (20)  
Transfers out of Level 3 0 0 0 (51)  
Fair value of net assets at end of period 26 41 26 41  
Change during the period in unrealized gains (losses) related to assets and liabilities held at end of period (11) 14 (17) 8  
Level 3 | Electricity
         
Assets at Fair Value          
Derivative contracts 32   32   52
Liabilities at Fair Value          
Derivative contracts 6   6   1
Level 3 | Natural gas
         
Assets at Fair Value          
Derivative contracts 0   0    
Liabilities at Fair Value          
Derivative contracts         0
Level 3 | Interest rate
         
Liabilities at Fair Value          
Derivative contracts 0   0   0
Netting and Collateral
         
Assets at Fair Value          
Money market funds 0 [1],[5]   0 [1],[5]   0 [1],[5]
Total assets (11) [5]   (11) [5]   (3) [5]
Liabilities at Fair Value          
Total liabilities (11) [5]   (11) [5]   (10) [5]
Netting and Collateral | Midwest Generation LLC
         
Assets at Fair Value          
Money market funds 0 [2],[6]   0 [2],[6]   0 [2],[6]
Total assets 0 [6]   0 [6]   0 [6]
Liabilities at Fair Value          
Total liabilities 0 [6]   0 [6]   0 [6]
Netting and Collateral | Electricity
         
Assets at Fair Value          
Derivative contracts (10) [5]   (10) [5]   (3) [5]
Liabilities at Fair Value          
Derivative contracts (11) [5]   (11) [5]   (7) [5]
Netting and Collateral | Electricity | Midwest Generation LLC
         
Assets at Fair Value          
Derivative contracts 0 [6]   0 [6]   0 [6]
Liabilities at Fair Value          
Derivative contracts 0 [6]   0 [6]   0 [6]
Netting and Collateral | Natural gas
         
Assets at Fair Value          
Derivative contracts (1) [5]   (1) [5]    
Liabilities at Fair Value          
Derivative contracts         (3) [5]
Netting and Collateral | Interest rate
         
Liabilities at Fair Value          
Derivative contracts $ 0 [5]   $ 0 [5]   $ 0 [5]
[1] Money market funds are included in cash and cash equivalents on EME's consolidated balance sheets.
[2] Money market funds are included in cash and cash equivalents on Midwest Generation's consolidated balance sheets.
[3] Reported in operating revenues on EME's consolidated statements of operations.
[4] Included in reclassification adjustments in EME's consolidated statement of OCI.
[5] Represents cash collateral and the impact of netting across the levels of the fair value hierarchy. Netting among positions classified within the same level is included in that level.
[6] Represents the impact of netting across the levels of the fair value hierarchy. Netting among positions classified within the same level is included in that level.