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Regulatory Assets and Liabilities (Tables)
12 Months Ended
Dec. 31, 2012
Table Text Block  
Schedule of Regulatory Assets and Liabilities
   December 31,  
   2012 2011 Recovery/Refund Period
          
REGULATORY ASSETS (in millions)  
Current regulatory assets:        
Brazil tariff recoveries:(1)        
 Energy purchases $ 189 $ 79 Over tariff reset period
 Transmission costs, regulatory fees and other   78   185 Over tariff reset period
El Salvador tariff recoveries(2)   115   108 Over tariff reset period
Other(3)   26   19 Various
Total current regulatory assets   408   391  
          
Noncurrent regulatory assets:        
Defined benefit pension obligations at IPL and DPL(4)(5)   430   399 Various
Income taxes recoverable from customers(4)(6)   81   76 Various
Brazil tariff recoveries:(1)        
 Energy purchases   97   84 Over tariff reset period
 Transmission costs, regulatory fees and other   59   86 Over tariff reset period
Deferred Midwest ISO costs(7)   89   80 To be determined
Other(3)   115   122 Various
Total noncurrent regulatory assets   871   847  
TOTAL REGULATORY ASSETS $ 1,279 $ 1,238  
          
REGULATORY LIABILITIES        
Current regulatory liabilities:        
Brazil tariff reset adjustment(8) $ 89 $ 190 Three years
Efficiency program costs(9)   32   29 Over tariff reset period
Brazil tariff recoveries:(1)        
 Energy purchases   171   305 Over tariff reset period
 Transmission costs, regulatory fees and other   55   172 Over tariff reset period
Other(10)   41   37 Various
Total current regulatory liabilities   388   733  
          
Noncurrent regulatory liabilities:        
Brazil tariff reset adjustment(8)   445   - Three years
Asset retirement obligations(11)   560   649 Over life of assets
Brazil special obligations(12)   463   422 To be determined
Brazil tariff recoveries:(1)        
 Energy purchases   46   76 Over tariff reset period
 Transmission costs, regulatory fees and other   42   64 Over tariff reset period
Efficiency program costs(9)   17   44 Over tariff reset period
Other(10)   129   24 Various
Total noncurrent regulatory liabilities   1,702   1,279  
TOTAL REGULATORY LIABILITIES $ 2,090 $ 2,012  
Schedule of Regulatory Assets by Region
   December 31,
   2012 2011
              
   Regulatory Assets Regulatory Liabilities Regulatory Assets Regulatory Liabilities
  (in millions)
              
Brazil Utilities $ 427 $ 1,390 $ 438 $ 1,333
US Utilities   737   700   692   679
Corporate and Other   115   -   108   -
 Total $ 1,279 $ 2,090 $ 1,238 $ 2,012