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Earnings Per Share - Earnings Per Share (EPS), Basic and Diluted (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Basic EPS      
Net income (loss) attributable to parent company $ (1,158) $ 650 $ 830
Weighted average shares outstanding 886,699,953 883,619,377 880,375,234
Basic EPS $ (1.31) $ 0.74 $ 0.94
Diluted EPS      
Net income (loss) attributable to parent company (1,158) 650 830
Convertible debt interest    5 10
Net income (loss) attributable to parent company adjusted $ (1,158) $ 655 $ 840
Weighted average shares outstanding 886,699,953 883,619,377 880,375,234
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 886,699,953 904,464,746 911,111,693
Diluted EPS $ (1.31) $ 0.72 $ 0.92