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Earnings (Loss) Per Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Basic EPS      
Net income (loss) attributable to parent company $ 650 $ 830 $ (1,131)
Weighted average shares outstanding 883,619,377 880,375,234 876,928,190
Basic EPS $ 0.74 $ 0.94 $ (1.29)
Diluted EPS      
Net income (loss) attributable to parent company 650 830 (1,131)
Convertible debt interest 5 10  
Net income (loss) attributable to parent company adjusted $ 655 $ 840 $ (1,131)
Weighted average shares outstanding 883,619,377 880,375,234 876,928,190
Dilutive effect of nonvested shares 3,771,729 3,555,806  
Dilutive effect of convertible debt 17,073,640 27,180,653  
Number of shares used in calculating diluted EPS 904,464,746 911,111,693 876,928,190
Diluted EPS $ 0.72 $ 0.92 $ (1.29)
Convertible debt [Line Items]      
Common shares outstanding for convertible debt 8,790,024    
0.50% convertible bonds due 2013 [Member]
      
Convertible debt [Line Items]      
Common shares outstanding for convertible debt 5,624    
1.50% convertible bonds due 2016 [Member]
      
Convertible debt [Line Items]      
Common shares outstanding for convertible debt 8,784,400    
Stock Options [Member]
      
Antidilutive Shares Included in Outstanding Stock Options [Line Items]      
Portion of anti-dilutive shares in outstanding stock option 26,453,152 35,296,895 37,943,832