Pension and Other Benefit Plans - Changes in Projected Benefit Obligation, Plan Assets and Funded Status of Plans (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Amounts Recognized in Balance Sheet
Postretirement Benefits	$ (1,434)	$ (1,501)
US Plan Assets
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	4,137	3,418
Service cost	86	72	$ 80
Interest cost	170	164	150
Actuarial (gains) losses	(205)	627
Benefits paid	(163)	(144)
Projected benefit obligation at end of year	4,025	4,137	3,418
Change in Plan Assets
Plan assets at fair value at beginning of year	3,549	3,269
Actual return on plan assets	(1)	339
Company contributions	82	85
Benefits paid	(163)	(144)
Plan assets at fair value at end of year	3,467	3,549	3,269
Unfunded Liability	(558)	(588)
Amounts Recognized in Balance Sheet
Postretirement Benefits	(558)	(588)
Total of post retirement benefits	(558)	(588)
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial (gains) losses	1,008	1,104
Prior service cost	54	66
Total amount recognized in accumulated other comprehensive income	1,062	1,170
Accumulated benefit obligation	3,763	3,805
International
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	7,249	5,981
Service cost	167	126	127
Interest cost	297	288	253
Contribution by plan participants	143	122
Actuarial (gains) losses	(203)	1,000
Currency effect	(66)	(90)
Benefits paid	(247)	(178)
Projected benefit obligation at end of year	7,340	7,249	5,981
Change in Plan Assets
Plan assets at fair value at beginning of year	6,830	6,246
Actual return on plan assets	(4)	502
Currency effect	(69)	(102)
Company contributions	198	240
Contributions by plan participants	125	122
Benefits paid	(248)	(178)
Plan assets at fair value at end of year	6,832	6,830	$ 6,246
Unfunded Liability	(508)	(419)
Amounts Recognized in Balance Sheet
Postretirement Benefits	(657)	(546)
Other Assets	149	127
Total of post retirement benefits	(508)	(419)
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial (gains) losses	335	1,658
Prior service cost		357
Total amount recognized in accumulated other comprehensive income	335	2,015
Accumulated benefit obligation	$ 6,913	$ 6,793

Defined benefit plan benefits paid on plan assets.

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Defined benefit plan contributions by plan participants on plan assets.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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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.

+ References

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

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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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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 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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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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