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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Basic EPS      
Net income (loss) attributable to parent company $ (500) $ (1,158) $ 650
Weighted average shares outstanding 889,541,922 886,699,953 883,619,377
Basic EPS $ (0.56) $ (1.31) $ 0.74
Diluted EPS      
Net income (loss) attributable to parent company (500) (1,158) 650
Convertible debt interest 0    5
Net income (loss) attributable to parent company adjusted $ (500) $ (1,158) $ 655
Weighted average shares outstanding 889,541,922 886,699,953 883,619,377
Dilutive effect of unvested shares       3,771,729
Dilutive effect of convertible debt       17,073,640
Number of shares used in calculating diluted EPS 889,541,922 886,699,953 904,464,746
Diluted EPS $ (0.56) $ (1.31) $ 0.72