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Post-Employment and Other Long-Term Employees Benefits - Pension Plan Asset Allocation Including Fair-Value Measurements (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 480us-gaap_DefinedBenefitPlanFairValueOfPlanAssets	$ 448us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
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Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
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Debt Securities Issued by Foreign Governments [Member]
Defined Benefit Plan Disclosure [Line Items]
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Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
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Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
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Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
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Other Plan Asset [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 1 [Member] | Debt Securities Issued by Foreign Governments [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 2 [Member] | Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 2 [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 3 [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
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Fair Value, Inputs, Level 3 [Member] | Other Plan Asset [Member]
Defined Benefit Plan Disclosure [Line Items]
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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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