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Earnings per Share - Summary of Earnings per Share ("EPS") (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Basic EPS      
Net income (loss) attributable to parent company $ 104 $ 128 $ (500)
Weighted average shares outstanding 876,510,959 886,532,167 889,541,922
Basic EPS $ 0.12 $ 0.14 $ (0.56)
Diluted EPS      
Net income (loss) attributable to parent company $ 104 $ 128 $ (500)
Convertible debt interest 0 0 0
Net income (loss) attributable to parent company adjusted $ 104 $ 128 $ (500)
Weighted average shares outstanding 876,510,959 886,532,167 889,541,922
Dilutive effect of stock awards 4,043,813 3,278,537  
Number of shares used in calculating diluted EPS 880,554,772 889,810,704 889,541,922
Diluted EPS $ 0.12 $ 0.14 $ (0.56)