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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
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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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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.9) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6801-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 9 -Article 5 + Details
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