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Schedule II - Valuation and Qualifying Accounts (Tables)
12 Months Ended
Dec. 31, 2011
Valuation and Qualifying Accounts Tables [Abstract]  
Valuation and Qualifying Accounts
THE AES CORPORATION
SCHEDULE II
VALUATION AND QUALIFYING ACCOUNTS
(IN MILLIONS)
                  
    Balance at Charged       Balance at
    Beginning of to Cost Amounts Translation the End of
    the Period and Expense  Written off Adjustment the Period
Allowance for accounts receivables               
 (current and noncurrent)               
Year ended December 31, 2009. $ 239 $ 104 $ (109) $ 42 $ 276
Year ended December 31, 2010.   276   53   (37)   3   295
Year ended December 31, 2011.   295   43   (41)   (24)   273