Summary of Funded Status of Pension Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	$ (15)	$ (153)
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	(1)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	(177)
Employee Benefit Plans [Abstract]
Benefit obligation at end of prior year	670	670
Service cost	5us-gaap_DefinedBenefitPlanServiceCost	5us-gaap_DefinedBenefitPlanServiceCost	5us-gaap_DefinedBenefitPlanServiceCost
Interest cost	29us-gaap_DefinedBenefitPlanInterestCost	26us-gaap_DefinedBenefitPlanInterestCost	27us-gaap_DefinedBenefitPlanInterestCost
Plan amendments	(1)	1
Actuarial loss	72	(19)
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	(34)	8
Benefit obligation at end of current year	716	670	670
Fair value of assets at end of prior year	517	465
Actual return on plan assets	56	52
Employer contributions	26	17
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	(21)	4
Net benefits paid	(25)us-gaap_DefinedBenefitPlanBenefitsPaid	(21)us-gaap_DefinedBenefitPlanBenefitsPaid
Fair value of assets at end of current year	553	517	465
Total unfunded status at end of year (recognized in other non-current liabilities in the Consolidated Balance Sheets)	$ (163)	$ (153)

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The increase in the fair value of plan assets from contributions made by the employer.

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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.

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Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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