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Earnings per Share - Summary of Earnings per Share ("EPS") (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Basic EPS      
Net income (loss) attributable to parent company $ 128us-gaap_NetIncomeLoss $ (500)us-gaap_NetIncomeLoss $ (1,158)us-gaap_NetIncomeLoss
Weighted average shares outstanding 886,532,167us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 889,541,922us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 886,699,953us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic EPS $ 0.14us-gaap_EarningsPerShareBasic $ (0.56)us-gaap_EarningsPerShareBasic $ (1.31)us-gaap_EarningsPerShareBasic
Diluted EPS      
Net income (loss) attributable to parent company 128us-gaap_NetIncomeLoss (500)us-gaap_NetIncomeLoss (1,158)us-gaap_NetIncomeLoss
Net income (loss) attributable to parent company adjusted $ 128us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (500)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (1,158)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average shares outstanding 886,532,167us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 889,541,922us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 886,699,953us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of unvested shares 3,278,537us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements    
Number of shares used in calculating diluted EPS 889,810,704us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 889,541,922us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 886,699,953us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted EPS $ 0.14us-gaap_EarningsPerShareDiluted $ (0.56)us-gaap_EarningsPerShareDiluted $ (1.31)us-gaap_EarningsPerShareDiluted