Post-Employment and Other Long-Term Employees Benefits - Changes in Benefit Obligation and Plan Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in plan assets:
Plan assets at fair value at beginning of year	$ 448
Employer contributions	28	29
Foreign currency translation adjustments	(1)
Plan assets at fair value at end of year	480	448
Net amount recognized in the balance sheet consisted of the following:
Non-current assets	9	10
Long-term liabilities	(392)	(366)
Pension Benefits [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	807	901
Service cost	27	37	40
Interest cost	28	28	31
Employee contributions	6	5
Benefits paid	(20)	(19)
Effect of curtailment		(3)
Effect of settlement	(14)	(32)
Actuarial (gain) loss	93	(92)
Transfer in	2	12
Transfer out	(2)	(12)
Acquisition / change in scope		9
Plan amendment		5
ST-Ericsson deconsolidation		(49)
Foreign currency translation adjustment	(64)	17
Benefit obligation at end of year	863	807	901
Change in plan assets:
Plan assets at fair value at beginning of year	448	422
Actual return on plan assets	41	32
Employer contributions	28	29
Employee contributions	6	5
Benefits paid	(10)	(9)
Effect of settlement	(12)	(25)
Transfer in		8
Transfer out		(8)
Foreign currency translation adjustments	(21)	5
ST-Ericsson deconsolidation		(11)
Plan assets at fair value at end of year	480	448	422
Funded status	(383)	(359)
Net amount recognized in the balance sheet consisted of the following:
Non-current assets	9	10
Current liabilities	(9)	(12)
Long-term liabilities	(383)	(357)
Net amount recognized	(383)	(359)
Other Long-Term Benefit [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	65	63
Service cost	7	8	9
Interest cost	2	2	3
Benefits paid	(4)	(4)
Effect of curtailment		(2)
Actuarial (gain) loss	2
Transfer in	1	1
Transfer out	(1)	(1)
Acquisition / change in scope		1
Plan amendment	1
ST-Ericsson deconsolidation		(4)
Foreign currency translation adjustment	(8)	1
Benefit obligation at end of year	65	65	63
Change in plan assets:
Funded status	(65)	(65)
Net amount recognized in the balance sheet consisted of the following:
Current liabilities	(11)	(5)
Long-term liabilities	(54)	(60)
Net amount recognized	$ (65)	$ (65)

Defined Benefit Plan Plan Assets Benefits Paid.

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Defined Benefit Plan Plan Assets Transfer In.

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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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-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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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 aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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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 amount of increase in the benefit obligation attributed to business combinations.

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

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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The amount of decrease in the plan benefit obligation attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary.

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The amount of decrease in the plan assets attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary.

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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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The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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The amount that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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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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