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Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 24 Months Ended 0 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Jul. 07, 2011
Posco [Member]
Jul. 07, 2011
CIC [Member]
Jul. 07, 2011
Mong Duong [Member]
MW
Accumulated Other Comprehensive Loss                              
Foreign currency translation adjustment $ 2,057       $ 1,967       $ 2,057 $ 1,967   $ 1,967      
Unrealized derivative losses, net 481       534       481 534   534      
Unfunded pension obligation (382)       (257)       (382) (257)   (257)      
Securities available-for-sale 0       0       0 0   0      
Accumulated other comprehensive loss 2,920       2,758       2,920 2,758   2,758      
Dividend                              
Common Stock Dividends Per Share Declared $ 0.04 $ 0.04 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0.08 $ 0 $ 0        
Stock Repurchase Plan [Abstract]                              
Stock Repurchase Program, Increase In Authorized Amount                 300            
Acquisition of treasury stock (shares)                   24,790,384   58,715,189      
Treasury Stock Value Acquired Cost Method Excluding Commissions                   301   680      
Treasury Stock Acquired Average Cost Per Share                   $ 12.16   $ 11.58      
Treasury stock, shares 66,415,984       42,386,961       66,415,984 42,386,961   42,386,961      
Transfers To From Noncontrolling Interests [Abstract]                              
Net transfers (to) from noncontrolling interest                 11 19          
Subsidiary or Equity Method Investee [Line Items]                              
Equity interest purchased                             10.00%
Equity interest sold                         30.00% 19.00%  
Generation Capacity (MW)                             1,240
Ownership after all transactions                             51.00%
Net gain on transaction                             $ 19