v2.4.0.6
DEBT (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Jan. 31, 2013
Dec. 31, 2012
Debt Issued      
Long term debt including non-recourse debt and current potion $ 4,672   $ 4,251
Liquidity facility
     
Debt Issued      
Credit facility, borrowings outstanding 0   0
Liquidity facility | Previous agreement
     
Debt Issued      
Maximum borrowing capacity   526  
Liquidity facility | As adjusted
     
Debt Issued      
Maximum borrowing capacity   600  
Commercial paper program
     
Debt Issued      
Maximum borrowing capacity   600  
Credit facility, borrowings outstanding 0   0
Level 2
     
Debt Issued      
Long-term debt including current portion and non-recourse debt, fair value 4,750   4,322
Level 3
     
Debt Issued      
Long-term debt including current portion and non-recourse debt, fair value $ 236   $ 259