XML 99 R60.htm IDEA: XBRL DOCUMENT v2.4.0.6
Fair Value Measurements (Recurring Fair Value Measurements) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Assets at Fair Value    
Money market funds $ 615 [1] $ 1,179 [1]
Derivative contracts 90 102
Total assets 705 1,281
Liabilities at Fair Value    
Total liabilities 118 91
Midwest Generation LLC
   
Assets at Fair Value    
Money market funds 75 [2] 195 [2]
Derivative contracts 2 44
Total assets 77 239
Liabilities at Fair Value    
Total liabilities 3 2
Electricity
   
Assets at Fair Value    
Derivative contracts 90 102
Liabilities at Fair Value    
Derivative contracts 0 1
Electricity | Midwest Generation LLC
   
Assets at Fair Value    
Derivative contracts 2 44
Liabilities at Fair Value    
Derivative contracts 3 2
Natural gas
   
Assets at Fair Value    
Derivative contracts   0
Liabilities at Fair Value    
Derivative contracts 0  
Fuel oil
   
Assets at Fair Value    
Derivative contracts   0
Fuel oil | Midwest Generation LLC
   
Assets at Fair Value    
Derivative contracts   0
Interest rate contracts
   
Liabilities at Fair Value    
Derivative contracts 118 90
Level 1
   
Assets at Fair Value    
Money market funds 615 [1] 1,179 [1]
Total assets 615 1,187
Liabilities at Fair Value    
Total liabilities 3 0
Level 1 | Midwest Generation LLC
   
Assets at Fair Value    
Money market funds 75 [2] 195 [2]
Total assets 75 199
Liabilities at Fair Value    
Total liabilities 0 0
Level 1 | Electricity
   
Assets at Fair Value    
Derivative contracts 0 0
Liabilities at Fair Value    
Derivative contracts 0 0
Level 1 | Electricity | Midwest Generation LLC
   
Assets at Fair Value    
Derivative contracts 0 0
Liabilities at Fair Value    
Derivative contracts 0 0
Level 1 | Natural gas
   
Assets at Fair Value    
Derivative contracts   4
Liabilities at Fair Value    
Derivative contracts 3  
Level 1 | Fuel oil
   
Assets at Fair Value    
Derivative contracts   4
Level 1 | Fuel oil | Midwest Generation LLC
   
Assets at Fair Value    
Derivative contracts   4
Level 1 | Interest rate contracts
   
Liabilities at Fair Value    
Derivative contracts 0 0
Level 2
   
Assets at Fair Value    
Money market funds 0 [1] 0 [1]
Total assets 41 65
Liabilities at Fair Value    
Total liabilities 124 95
Level 2 | Midwest Generation LLC
   
Assets at Fair Value    
Money market funds 0 [2] 0 [2]
Total assets 2 40
Liabilities at Fair Value    
Total liabilities 3 2
Level 2 | Electricity
   
Assets at Fair Value    
Derivative contracts 41 65
Liabilities at Fair Value    
Derivative contracts 6 5
Level 2 | Electricity | Midwest Generation LLC
   
Assets at Fair Value    
Derivative contracts 2 40
Liabilities at Fair Value    
Derivative contracts 3 2
Level 2 | Natural gas
   
Assets at Fair Value    
Derivative contracts   0
Liabilities at Fair Value    
Derivative contracts 0  
Level 2 | Fuel oil
   
Assets at Fair Value    
Derivative contracts   0
Level 2 | Fuel oil | Midwest Generation LLC
   
Assets at Fair Value    
Derivative contracts   0
Level 2 | Interest rate contracts
   
Liabilities at Fair Value    
Derivative contracts 118 90
Level 3
   
Assets at Fair Value    
Money market funds 0 [1] 0 [1]
Total assets 52 95
Liabilities at Fair Value    
Total liabilities 1 12
Fair Value Disclosures Level 3 [Roll Forward]    
Fair value of net assets at beginning of period 83 91
Total realized/unrealized gains (losses)    
Included in earnings 9 [3] (17) [3]
Included in accumulated other comprehensive loss 1 [4] 1 [4]
Purchases 58 34
Settlements (46) (24)
Transfers out of Level 3 (54) (2)
Fair value of net assets at end of period 51 83
Change during the period in unrealized gains (losses) related to assets and liabilities held at end of period 22 17
Level 3 | Midwest Generation LLC
   
Assets at Fair Value    
Money market funds 0 [2] 0 [2]
Total assets 0 0
Liabilities at Fair Value    
Total liabilities 0 0
Level 3 | Electricity
   
Assets at Fair Value    
Derivative contracts 52 95
Liabilities at Fair Value    
Derivative contracts 1 12
Level 3 | Electricity | Midwest Generation LLC
   
Assets at Fair Value    
Derivative contracts 0 0
Liabilities at Fair Value    
Derivative contracts 0 0
Level 3 | Natural gas
   
Assets at Fair Value    
Derivative contracts   0
Liabilities at Fair Value    
Derivative contracts 0  
Level 3 | Fuel oil
   
Assets at Fair Value    
Derivative contracts   0
Level 3 | Fuel oil | Midwest Generation LLC
   
Assets at Fair Value    
Derivative contracts   0
Level 3 | Interest rate contracts
   
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 (3) [5] (66) [5]
Liabilities at Fair Value    
Total liabilities (10) [5] (16) [5]
Netting and Collateral | Midwest Generation LLC
   
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] 0 [6]
Netting and Collateral | Electricity
   
Assets at Fair Value    
Derivative contracts (3) [5] (58) [5]
Liabilities at Fair Value    
Derivative contracts (7) [5] (16) [5]
Netting and Collateral | Electricity | Midwest Generation LLC
   
Assets at Fair Value    
Derivative contracts 0 [6] 4 [6]
Liabilities at Fair Value    
Derivative contracts 0 [6] 0 [6]
Netting and Collateral | Natural gas
   
Assets at Fair Value    
Derivative contracts   (4) [5]
Liabilities at Fair Value    
Derivative contracts (3) [5]  
Netting and Collateral | Fuel oil
   
Assets at Fair Value    
Derivative contracts   (4) [5]
Netting and Collateral | Fuel oil | Midwest Generation LLC
   
Assets at Fair Value    
Derivative contracts   (4) [6]
Netting and Collateral | Interest rate contracts
   
Liabilities at Fair Value    
Derivative contracts $ 0 [5] $ 0 [5]
[1] Money market funds are included in cash and cash equivalents and in restricted 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 other comprehensive loss.
[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.