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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2012
Derivative Instruments And Hedging Activities Tables [Abstract]  
Interest Rate Derivatives By Type Table
   December 31, 2012
   Current Maximum(1)    
     Derivative   Derivative Weighted % of Debt
     Notional   Notional Average Currently
   Derivative Translated Derivative Translated Remaining Hedged
Interest Rate and Cross Currency(1) Notional to USD Notional to USD Term by Index(2)
                
   (in millions) (in years)  
Interest Rate Derivatives:               
LIBOR (U.S. Dollar) 3,413 $3,413 4,272 $4,272 10 70%
EURIBOR (Euro) 611  807 611  807 9 64%
LIBOR (British Pound Sterling) 67  109 69  112 12 86%
Cross Currency Swaps:               
Chilean Unidad de Fomento  6  267 6  267 9 85%
Foreign Currency Forwards By Type Table
   December 31, 2012
        Weighted
    Notional  Average
    Translated  Remaining
Foreign Currency Derivatives Notional(1)to USD  Term(2)
         
  (in millions)  (in years)
Foreign Currency Options and Forwards:       
Euro 98$126  <1
Chilean Peso 52,575 108  <1
Brazilian Real 175 83  <1
Colombian Peso 89,928 49  <1
British Pound 17 27  <1
Argentine Peso 118 20  1
Embedded Foreign Currency Derivatives:       
Argentine Peso  849  173   11
Kazakhstani Tenge  1,195  8   4
Euro  2  2   11
Commodity Non Hedge Derivatives By Type Table
  December 31, 2012
    Weighted Average
Commodity Derivatives Notional Remaining Term(1)
  (in millions) (in years)
Aluminum (MWh)(2) 14 7
Power (MWh) 4 3
Fair Value Hierarchy Derivative Assets Liabilities By Balance Sheet Classification Table
     December 31, 2012 December 31, 2011
     Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total
                            
     (in millions) (in millions)
Assets                        
 Interest rate derivatives $ - $ 2 $ - $ 2 $ - $ - $ - $ -
 Cross currency derivatives   -   6   -   6   -   -   1   1
 Foreign currency derivatives   -   2   79   81   -   27   62   89
 Commodity and other derivatives   -   8   3   11   2   25   3   30
   Total assets $ -   18 $ 82 $ 100 $ 2 $ 52 $ 66 $ 120
                            
Liabilities                        
 Interest rate derivatives $ - $ 153 $ 412 $ 565 $ - $ 431 $ 128 $ 559
 Cross currency derivatives   -   6   -   6   -   -   19   19
 Foreign currency derivatives   -   7   7   14   -   15   11   26
 Commodity and other derivatives   -   13   59   72   -   30   56   86
   Total liabilities $ - $ 179 $ 478 $ 657 $ - $ 476 $ 214 $ 690
Derivative Assets Liabilities At Fair Value Net By Balance Sheet Classification And Type Table
     December 31, 2012 December 31, 2011
       Not     Not  
     Designated Designated    Designated Designated   
     as Hedging as Hedging   as Hedging as Hedging  
     Instruments Instruments Total Instruments Instruments Total
                      
     (in millions)    (in millions)   
Assets                  
 Interest rate derivatives $ - $ 2 $ 2 $ - $ - $ -
 Cross currency derivatives   6   -   6   1   -   1
 Foreign currency derivatives   -   81   81   13   76   89
 Commodity and other derivatives   2   9   11   2   28   30
Total assets $ 8 $ 92 $ 100 $ 16 $ 104 $ 120
                      
Liabilities                  
 Interest rate derivatives $ 544 $ 21 $ 565 $ 535 $ 24 $ 559
 Cross currency derivatives   6   -   6   19   -   19
 Foreign currency derivatives   7   7   14   1   25   26
 Commodity and other derivatives   8   64   72   3   83   86
Total liabilities $ 565 $ 92 $ 657 $ 558 $ 132 $ 690
Gain Loss In Accumulated Other Comprehensive Income And Earnings On Effective Portion Of Qualifying Cash Flow Hedges Table
   Gains (Losses)    Gains (Losses) Reclassified
   Recognized in AOCL Consolidated from AOCL into Earnings
   2012 2011 2010 Statement of Operations 2012 2011 2010
                       
   (in millions)    (in millions)
Interest rate derivatives $ (175) $ (475) $ (288) Interest expense $ (135) $ (125) $ (110)
            Non-regulated cost of sales   (6)   (3)   (3)
            Net equity in earnings of         
             affiliates   (7)   (4)   (1)
            Income (loss) from          
             discontinued operations   -   -   (113)
            Asset impairment expense   (6)   -   -
            Gain on sale of investments   (96)   -   -
Cross currency derivatives   4   (36)   15 Interest expense   (12)   (10)   (4)
            Foreign currency transaction         
             gains (losses)   26   (16)   25
Foreign currency derivatives   10   24   (16) Foreign currency transaction         
             gains (losses)   5   1   (8)
Commodity and other                     
 derivatives   (8)   -   (9) Non-regulated revenue   (2)   -   1
            Non-regulated cost of sales   -   (2)   -
            Income (loss) from          
             discontinued operations   -   -   10
Total $ (169) $ (487) $ (298)    $ (233) $ (159) $ (203)
Gain Loss In Earnings On Ineffective Portion Of Qualifying Cash Flow Hedges Table
     Gains (Losses)
  Classification in  Recognized in Earnings
  Consolidated Statement of Operations 2012 2011 2010
          
     (in millions)
Interest rate derivatives Interest expense $ (2) $ (6) $ (15)
  Net equity in earnings of affiliates   (1)   (2)   -
Cross currency derivatives Interest expense   (1)   (4)   5
Total    $ (4) $ (12) $ (10)
Gain Loss In Earnings On Non Hedging Instruments Table
  Classification Gains (Losses)
  in Consolidated Recognized in Earnings
  Statement of Operations 2012 2011 2010
          
     (in millions)
Interest rate derivatives Interest expense $ (5) $ (4) $ (9)
Foreign currency derivatives Foreign currency transaction         
   gains (losses)   (141)   60   (35)
  Net equity in earnings of affiliates   -   -   (2)
Commodity and other derivatives Non-regulated revenue   20   (63)   29
  Regulated revenue   (10)   1   -
  Non-regulated cost of sales   2   (9)   5
  Regulated cost of sales   (15)   (5)   -
Total    $ (149) $ (20) $ (12)