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Fair Value Measurements (Recurring Fair Value Measurements) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Assets at Fair Value    
Money market funds $ 983 [1] $ 615 [1]
Electricity derivative contracts 62 90
Total assets 1,045 705
Liabilities at Fair Value    
Total liabilities 56 118
Midwest Generation LLC [Member]
   
Assets at Fair Value    
Money market funds 101 [2] 75 [2]
Total assets 101 77
Liabilities at Fair Value    
Total liabilities   3
Electricity
   
Assets at Fair Value    
Electricity derivative contracts 57 90
Liabilities at Fair Value    
Derivative contracts 0 0
Electricity | Midwest Generation LLC [Member]
   
Assets at Fair Value    
Electricity derivative contracts   2
Liabilities at Fair Value    
Derivative contracts   3
Natural gas
   
Liabilities at Fair Value    
Derivative contracts 0 0
Interest Rate Swap [Member]
   
Assets at Fair Value    
Interest rate derivative contracts 5  
Liabilities at Fair Value    
Derivative contracts 56 118
Level 1
   
Assets at Fair Value    
Money market funds 983 [1] 615 [1]
Total assets 983 615
Liabilities at Fair Value    
Total liabilities 1 3
Level 1 | Midwest Generation LLC [Member]
   
Assets at Fair Value    
Money market funds 101 [2] 75
Total assets 101 75
Liabilities at Fair Value    
Total liabilities   0
Level 1 | Electricity
   
Assets at Fair Value    
Electricity derivative contracts 0 0
Liabilities at Fair Value    
Derivative contracts 0 0
Level 1 | Electricity | Midwest Generation LLC [Member]
   
Assets at Fair Value    
Electricity derivative contracts   0
Liabilities at Fair Value    
Derivative contracts   0
Level 1 | Natural gas
   
Liabilities at Fair Value    
Derivative contracts 1 3
Level 1 | Interest Rate Swap [Member]
   
Assets at Fair Value    
Interest rate derivative contracts 0  
Liabilities at Fair Value    
Derivative contracts 0 0
Level 2
   
Assets at Fair Value    
Money market funds 0 [1] 0 [1]
Total assets 33 41
Liabilities at Fair Value    
Total liabilities 56 124
Level 2 | Midwest Generation LLC [Member]
   
Assets at Fair Value    
Money market funds 0 [2] 0 [2]
Total assets 0 2
Liabilities at Fair Value    
Total liabilities   3
Level 2 | Electricity
   
Assets at Fair Value    
Electricity derivative contracts 28 41
Liabilities at Fair Value    
Derivative contracts 0 6
Level 2 | Electricity | Midwest Generation LLC [Member]
   
Assets at Fair Value    
Electricity derivative contracts   2
Liabilities at Fair Value    
Derivative contracts   3
Level 2 | Natural gas
   
Liabilities at Fair Value    
Derivative contracts 0 0
Level 2 | Interest Rate Swap [Member]
   
Assets at Fair Value    
Interest rate derivative contracts 5  
Liabilities at Fair Value    
Derivative contracts 56 118
Level 3
   
Assets at Fair Value    
Money market funds 0 [1] 0 [1]
Total assets 33 52
Liabilities at Fair Value    
Total liabilities 1 1
Fair Value Disclosures Level 3 [Roll Forward]    
Fair value of net assets at beginning of period 51 83
Total realized/unrealized gains (losses)    
Included in earnings (11) [3] 9 [3]
Included in accumulated other comprehensive loss 0 [4] 1 [4]
Purchases 46 58
Settlements (54) (46)
Transfers out of Level 3 0 (54)
Fair value of net assets at end of period 32 51
Change during the period in unrealized gains (losses) related to assets and liabilities held at end of period (2) 22
Level 3 | Electricity
   
Assets at Fair Value    
Electricity derivative contracts 33 52
Liabilities at Fair Value    
Derivative contracts 1 1
Level 3 | Natural gas
   
Liabilities at Fair Value    
Derivative contracts 0 0
Level 3 | Interest Rate Swap [Member]
   
Assets at Fair Value    
Interest rate derivative contracts 0  
Liabilities at Fair Value    
Derivative contracts 0 0
Netting and Collateral
   
Assets at Fair Value    
Money market funds 0 [1],[5] 0 [1],[5]
Total assets (4) [5] (3) [5]
Liabilities at Fair Value    
Total liabilities (2) [5] (10) [5]
Netting and Collateral | Midwest Generation LLC [Member]
   
Assets at Fair Value    
Money market funds 0 [2],[6] 0 [2],[6]
Total assets 0 [6] 0 [6]
Liabilities at Fair Value    
Total liabilities   0 [6]
Netting and Collateral | Electricity
   
Assets at Fair Value    
Electricity derivative contracts (4) [5] (3) [5]
Liabilities at Fair Value    
Derivative contracts (1) [5] (7) [5]
Netting and Collateral | Electricity | Midwest Generation LLC [Member]
   
Assets at Fair Value    
Electricity derivative contracts   0 [6]
Liabilities at Fair Value    
Derivative contracts   0 [6]
Netting and Collateral | Natural gas
   
Liabilities at Fair Value    
Derivative contracts (1) [5] (3)
Netting and Collateral | Interest Rate Swap [Member]
   
Assets at Fair Value    
Interest rate derivative contracts 0  
Liabilities at Fair Value    
Derivative contracts $ 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.