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Employee Benefit Plans - Assumptions Used to Determine Projected and Accumulated Benefit Obligations of Domestic Defined Benefit Pension and Postretirement Benefit Plans (Detail)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pre-65
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	7.00%	7.50%
Ultimate cost trend rate	4.50%	4.50%
Year that the rate reaches the ultimate cost trend rate	2023	2030	2030
Post-65
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	8.30%	8.80%
Ultimate cost trend rate	4.50%	4.50%
Year that the rate reaches the ultimate cost trend rate	2024	2030	2030
Defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.20%	3.80%
Weighted average rate of future compensation increases	3.80%	3.80%
Postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.20%	3.80%
Annual increase in Medicare Part B premium	6.00%	6.00%
Projected and Accumulated Benefit Obligations | Pre-65
Defined Benefit Plan Disclosure [Line Items]
Year that the rate reaches the ultimate cost trend rate	2023	2023
Projected and Accumulated Benefit Obligations | Post-65
Defined Benefit Plan Disclosure [Line Items]
Year that the rate reaches the ultimate cost trend rate	2024	2024

X

- Definition

Annual Increase In Medicare Part B Premium Used To Determine Projected And Accumulated Benefit Obligations For Domestic Postretirement Benefit Plans

+ References

No definition available.

+ Details

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- Definition

The ultimate trend rate for health care costs used to determine projected and accumulated benefit obligation.

+ References

No definition available.

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- Definition

Health Care Cost Trend Rate used to Determine Projected and Accumulated Benefit Obligation

+ References

No definition available.

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- Definition

The interest rate used to adjust for the time value of money for the 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 (k)(1)
-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ 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 (k)(2)
-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

+ 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 (l)
-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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