Long-Term Investments - Summarized Financial Information of Company's Equity-Method Investments (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Current assets	$ 4,807	$ 5,502
Non-current assets	4,366	4,932
Current liabilities	1,993	2,555
Non-current liabilities	1,463	1,515
Total revenues	8,082	8,493	9,735
Operating income (loss)	(465)	(2,081)	46
Net income (loss)	(629)	(2,188)	155
Equity Method Investments [Member]
Condensed Financial Statements, Captions [Line Items]
Current assets	266	121
Non-current assets	287	573
Current liabilities	178	168
Non-current liabilities	249	297
Total revenues	282	422	255
Operating income (loss)	(271)	(51)	(10)
Net income (loss)	$ (282)	$ (103)	$ (11)

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.

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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 after one year or beyond the normal operating cycle, if longer.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Amount of obligation due after one year or beyond the normal operating cycle, if longer.

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The net result for the period of deducting operating expenses from operating revenues.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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