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, 2018	Dec. 31, 2017	Dec. 31, 2016
Amounts Recognized in Balance Sheet
Postretirement Benefits	$ (1,153)	$ (1,082)
US
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	4,603	4,240
Service cost	59	57	$ 62
Interest cost	167	175	177
Actuarial (gains) losses	(349)	325
Benefits paid	(202)	(194)
Projected benefit obligation at end of year	4,278	4,603	4,240
Change in Plan Assets
Plan assets at fair value at beginning of year	4,058	3,625
Actual return on plan assets	(112)	622
Company contributions	4	5
Benefits paid	(202)	(194)
Plan assets at fair value at end of year	3,748	4,058	3,625
Unfunded Liability	(530)	(545)
Amounts Recognized in Balance Sheet
Postretirement Benefits	(530)	(545)
Total of post retirement benefits	(530)	(545)
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial losses	852	887
Prior service cost	18	30
Total amount recognized in accumulated other comprehensive income	870	917
Accumulated benefit obligation	4,070	4,347
International
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	8,752	7,793
Service cost	138	95	110
Interest cost	304	306	311
Contribution by plan participants	79	88
Actuarial (gains) losses	(758)	616
Currency effect	(87)	147
Benefits paid	(317)	(293)
Projected benefit obligation at end of year	8,111	8,752	7,793
Change in Plan Assets
Plan assets at fair value at beginning of year	8,507	7,194
Actual return on plan assets	(370)	1,216
Currency effect	(105)	161
Company contributions	78	88
Contributions by plan participants	79	88
Benefits paid	(317)	(293)
Other		53
Plan assets at fair value at end of year	7,872	8,507	$ 7,194
Unfunded Liability	(239)	(245)
Amounts Recognized in Balance Sheet
Postretirement Benefits	(514)	(418)
Other Assets	275	173
Total of post retirement benefits	(239)	(245)
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial losses	1,440	1,419
Prior service cost	9	17
Total amount recognized in accumulated other comprehensive income	1,449	1,436
Accumulated benefit obligation	$ 7,895	$ 8,400

Defined benefit plan other changes on plan assets.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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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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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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