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Fair Value (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Disclosure Tables [Abstract]  
Fair Value Summary Table
    December 31,
    2011 2010
    Carrying Fair Carrying Fair
    Amount Value Amount Value
               
    (in millions)
Assets            
 Marketable securities $ 1,356 $ 1,356 $ 1,760 $ 1,760
 Derivatives   120   120   119   119
  Total assets $ 1,476 $ 1,476 $ 1,879 $ 1,879
Liabilities            
 Debt $ 22,573 $ - $ 18,788 $ 20,137
 Derivatives   690   690   358   358
  Total liabilities $ 23,263 $ 690 $ 19,146 $ 20,495
Fair Value Hierarchy For Recurring Measurements Table
    Quoted Market Significant      
    Prices in Active Other Significant   
    Market for Observable Unobservable Total
    Identical Assets Inputs Inputs December 31,
    (Level 1) (Level 2) (Level 3) 2011
               
    (in millions)
               
Assets            
 Available-for-sale securities $ 1 $ 1,339 $ - $ 1,340
 Trading securities   12   -   -   12
 Derivatives   2   52   66   120
  Total assets $ 15 $ 1,391 $ 66 $ 1,472
               
Liabilities            
 Derivatives $ - $ 476 $ 214 $ 690
  Total liabilities $ - $ 476 $ 214 $ 690
               
    Quoted Market Significant      
    Prices in Active Other Significant   
    Market for Observable Unobservable Total
    Identical Assets Inputs Inputs December 31,
    (Level 1) (Level 2) (Level 3) 2010
               
    (in millions)
               
Assets            
 Available-for-sale securities $ 8 $ 1,700 $ 42 $ 1,750
 Trading securities   10   -   -   10
 Derivatives   -   58   61   119
  Total assets $ 18 $ 1,758 $ 103 $ 1,879
               
Liabilities            
 Derivatives $ - $ 346 $ 12 $ 358
  Total liabilities $ - $ 346 $ 12 $ 358
Derivatives Level 3 Rollforward Table
    Year Ended December 31, 2011
    Interest Cross Foreign Commodity  
    Rate  Currency Currency & Other Total
                
   (in millions)
                  
Balance at beginning of period $ (1) $ 10 $ 22 $ 18 $ 49
 Total gains (losses) (realized and unrealized):               
  Included in earnings(1)   -   (4)   32   (71)   (43)
  Included in other comprehensive income   (13)   (37)   -   -   (50)
  Included in regulatory assets   -   -   -   8   8
 Settlements   -   13   (3)   (8)   2
 Transfers of assets (liabilities) into Level 3(2)   (117)   -   -   -   (117)
 Transfers of (assets) liabilities out of Level 3(2)   3   -   -   -   3
Balance at end of period $ (128) $ (18) $ 51 $ (53) $ (148)
                  
Total gains (losses) for the period included in earnings               
 attributable to the change in unrealized gains (losses)               
 relating to assets and liabilities held at the end of the period $ - $ (2) $ 29 $ (71) $ (44)
                  
    Year Ended December 31, 2010
    Interest Cross Foreign Commodity  
    Rate  Currency Currency & Other Total
                
   (in millions)
                  
Balance at beginning of period $ (12) $ (12) $ - $ 24 $ -
 Total gains (losses) (realized and unrealized):               
  Included in earnings(1)   1   4   25   21   51
  Included in other comprehensive income   (12)   13   -   -   1
  Included in regulatory assets   (3)   -   -   1   (2)
 Settlements   7   5   (1)   (28)   (17)
 Transfers of assets (liabilities) into Level 3(2)   -   -   (2)   -   (2)
 Transfers of (assets) liabilities out of Level 3(2)   18   -   -   -   18
Balance at end of period $ (1) $ 10 $ 22 $ 18 $ 49
                  
Total gains (losses) for the period included in earnings               
 attributable to the change in unrealized gains (losses)               
 relating to assets and liabilities held at the end of the period $ - $ 7 $ 24 $ 9 $ 40
Available For Sale Securities Level 3 Rollforward Table
    Year Ended December 31,
    2011 2010
       
   (in millions)
         
Balance at beginning of period(1) $ 42 $ 42
 Settlements   (42)   -
Balance at end of period $ - $ 42
         
Total gains (losses) for the period included in earnings attributable to the       
 change in unrealized gains/losses relating to assets held at the       
 end of the period $ - $ -
Fair Value Assets Measured On Nonrecurring Basis Text Block
      Year Ended December 31, 2011
    Carrying Fair Value Gross
    Amount Level 1 Level 2 Level 3 (Gain) Loss
                 
    (in millions)
Long-lived assets held and used:               
 Wind turbines and deposits $ 161 $ - $ 45 $ - $ 116
 Tisza II   94   -   -   42   52
 Kelanitissa   66   -   -   24   42
 Bohemia   14   -   5   -   9
Discontinued operations and                
businesses held for sale:               
 Edelap, Edes and Central Dique   350   -   4   -   346
 Carbon reduction projects   49   -   -   -   40(1)
 Wind projects   22   -   -   -   22
 Borsod(2)   (9)   -   -   -   -
 Eastern Energy(2)   (123)   -   -   -   -
 Thames(2)   (7)   -   -   -   -
 Brazil Telecom businesses   142   -   893      (751)
Equity method affiliates:               
 Yangcheng   100   -   -   26   74
Goodwill:               
 Chigen   17   -   -   -   17
                 
      Year Ended December 31, 2010
    Carrying Fair Value Gross
    Amount Level 1 Level 2 Level 3 (Gain) Loss
                 
    (in millions)
Long-lived assets held and used:               
 Southland (Huntington Beach) $ 288 $ - $ - $ 88 $ 200
 Tisza II   160   -   -   75   85
 Deepwater   83   -   -   4   79
Discontinued operations and                
businesses held for sale:               
 Eastern Energy   827   -   -   -   827
 Barka   20   -   124   -   (104)
 Ras Laffan   120   -   226   -   (106)
Goodwill:               
 Deepwater   18   -   -   -   18
 Other   3   -   -   -   3