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Long-Term Investments - Summarized Financial Information of Company's Equity-Method Investments (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Current assets	$ 5,051us-gaap_AssetsCurrent	$ 4,807us-gaap_AssetsCurrent
Non-current assets	3,957us-gaap_AssetsNoncurrent	4,366us-gaap_AssetsNoncurrent
Current liabilities	1,766us-gaap_LiabilitiesCurrent	1,993us-gaap_LiabilitiesCurrent
Non-current liabilities	2,187us-gaap_LiabilitiesNoncurrent	1,463us-gaap_LiabilitiesNoncurrent
Total revenues	7,404us-gaap_SalesRevenueNet	8,082us-gaap_SalesRevenueNet	8,493us-gaap_SalesRevenueNet
Operating income (loss)	168us-gaap_OperatingIncomeLoss	(465)us-gaap_OperatingIncomeLoss	(2,081)us-gaap_OperatingIncomeLoss
Net income (loss)	129us-gaap_ProfitLoss	(629)us-gaap_ProfitLoss	(2,188)us-gaap_ProfitLoss
Equity-method Investments [Member]
Condensed Financial Statements, Captions [Line Items]
Current assets	166us-gaap_AssetsCurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember	266us-gaap_AssetsCurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Non-current assets	237us-gaap_AssetsNoncurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember	287us-gaap_AssetsNoncurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Current liabilities	117us-gaap_LiabilitiesCurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember	178us-gaap_LiabilitiesCurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Non-current liabilities	193us-gaap_LiabilitiesNoncurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember	249us-gaap_LiabilitiesNoncurrent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Total revenues	136us-gaap_SalesRevenueNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember	282us-gaap_SalesRevenueNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember	422us-gaap_SalesRevenueNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Operating income (loss)	(46)us-gaap_OperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember	(271)us-gaap_OperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember	(51)us-gaap_OperatingIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember
Net income (loss)	$ (50)us-gaap_ProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember	$ (282)us-gaap_ProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember	$ (103)us-gaap_ProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember

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