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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, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Assets at Fair Value          
Money market funds $ 873 [1]   $ 873 [1]   $ 1,207 [1]
Derivative contracts 98   98   99
Total assets 971   971   1,306
Liabilities at Fair Value          
Total liabilities 114   114   91
Electricity
         
Assets at Fair Value          
Derivative contracts 98   98   99
Liabilities at Fair Value          
Derivative contracts 0   0   1
Natural gas
         
Assets at Fair Value          
Derivative contracts 0   0   0
Fuel oil
         
Assets at Fair Value          
Derivative contracts         0
Interest rate contracts
         
Liabilities at Fair Value          
Derivative contracts 114   114   90
Level 1
         
Assets at Fair Value          
Money market funds 873 [1]   873 [1]   1,207
Derivative contracts 4   4   8
Total assets 877   877   1,215
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 | Natural gas
         
Assets at Fair Value          
Derivative contracts 4   4   4
Level 1 | Fuel oil
         
Assets at Fair Value          
Derivative contracts         4
Level 1 | Interest rate contracts
         
Liabilities at Fair Value          
Derivative contracts 0   0   0
Level 2
         
Assets at Fair Value          
Money market funds 0 [1]   0 [1]   0 [1]
Derivative contracts 106   106   66
Total assets 106   106   66
Liabilities at Fair Value          
Total liabilities 121   121   98
Level 2 | Electricity
         
Assets at Fair Value          
Derivative contracts 106   106   66
Liabilities at Fair Value          
Derivative contracts 7   7   8
Level 2 | Natural gas
         
Assets at Fair Value          
Derivative contracts 0   0   0
Level 2 | Fuel oil
         
Assets at Fair Value          
Derivative contracts         0
Level 2 | Interest rate contracts
         
Liabilities at Fair Value          
Derivative contracts 114   114   90
Level 3
         
Assets at Fair Value          
Money market funds 0 [1]   0 [1]   0 [1]
Derivative contracts 51   51   95
Total assets 51   51   95
Liabilities at Fair Value          
Total liabilities 10   10   12
Fair Value Disclosures Level 3 [Roll Forward]          
Fair value of net assets at beginning of period 24 83 83 91  
Total realized/unrealized gains (losses)          
Included in earnings 23 [2] 18 [2] 8 [2] 18 [2]  
Included in accumulated other comprehensive loss 0 [3] (4) [3] 2 [3] (3) [3]  
Purchases 13 6 19 11  
Settlements (19) (19) (20) (31)  
Transfers out of Level 3 0 [4] 0 [4] (51) [4] (2) [4]  
Fair value of net assets at end of period 41 84 41 84  
Change during the period in unrealized gains (losses) related to assets and liabilities, net held at end of period 14 14 8 8  
Level 3 | Electricity
         
Assets at Fair Value          
Derivative contracts 51   51   95
Liabilities at Fair Value          
Derivative contracts 10   10   12
Level 3 | Natural gas
         
Assets at Fair Value          
Derivative contracts 0   0   0
Level 3 | Fuel oil
         
Assets at Fair Value          
Derivative contracts         0
Level 3 | Interest rate contracts
         
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]
Derivative contracts (63) [5]   (63) [5]   (70) [5]
Total assets (63) [5]   (63) [5]   (70) [5]
Liabilities at Fair Value          
Total liabilities (17) [5]   (17) [5]   (19) [5]
Netting and Collateral | Electricity
         
Assets at Fair Value          
Derivative contracts (59) [5]   (59) [5]   (62) [5]
Liabilities at Fair Value          
Derivative contracts (17) [5]   (17) [5]   (19) [5]
Netting and Collateral | Natural gas
         
Assets at Fair Value          
Derivative contracts (4) [5]   (4) [5]   (4) [5]
Netting and Collateral | Fuel oil
         
Assets at Fair Value          
Derivative contracts         (4) [5]
Netting and Collateral | Interest rate contracts
         
Liabilities at Fair Value          
Derivative contracts $ 0 [5]   $ 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] Reported in operating revenues on EME's consolidated statements of operations.
[3] Included in reclassification adjustments in EME's consolidated statement of other comprehensive loss.
[4] Transfers out of Level 3 into Level 2 occurred due to significant observable inputs becoming available as the transactions near maturity.
[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.