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Benefit Obligation of Postretirement Benefit Plans (Detail) - Postretirement Benefit Plans - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit obligation at January 1		$ 394	$ 511
Service cost		7	12	$ 15
Interest cost		15	20	22
Benefits paid		(15)	(14)
Plan amendments	[1]	0	(149)
Currency		8	3
Assumption changes		30	34
Actuarial losses/(gains)		(4)	(23)
Accrued benefit obligation at December 31		$ 435	$ 394	$ 511
[1] Plan amendments in 2016 included a change in eligibility requirements related to medical and life insurance benefits and a change in benefits for Medicare-eligible participants.

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Defined Benefit Plan Assumption changes

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 60
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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 cost recognized for passage of time related to defined benefit plan.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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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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