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Funded Status Percentage of Company's Pension Plans (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Funded status percentage of the company's pension plans
Fair value of plan assets	$ 5,248,000,000	$ 4,501,000,000
PBO	$ 6,159,000,000
Funded status percentage	85.00%
United States and Puerto Rico
Funded status percentage of the company's pension plans
PBO	$ 0
United States and Puerto Rico | Qualified Pension Plan
Funded status percentage of the company's pension plans
Fair value of plan assets	4,426,000,000
PBO	$ 4,629,000,000
Funded status percentage	96.00%
United States and Puerto Rico | Non Qualified Pension Plan
Funded status percentage of the company's pension plans
PBO	$ 223,000,000
Foreign Pension Plans, Defined Benefit | Qualified Pension Plan
Funded status percentage of the company's pension plans
Fair value of plan assets	822,000,000
PBO	$ 908,000,000
Funded status percentage	91.00%
Foreign Pension Plans, Defined Benefit | Non Qualified Pension Plan
Funded status percentage of the company's pension plans
PBO	$ 399,000,000

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- Definition

Funded status percentage of company's pension plans.

+ References

No definition available.

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit 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
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

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

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- Definition

Percentage of plan assets to benefit obligation of defined benefit plan.

+ References

No definition available.

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