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Employee Benefit Plans - Assumptions Used to Calculate Net Periodic Benefit Cost for Domestic Defined Benefit Pension and Postretirement Benefit Plans (Detail)	6 Months Ended		12 Months Ended
	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pre-65
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate			7.50%	8.50%	8.50%
Ultimate cost trend rate			4.50%	6.10%	6.10%
Year that the rate reaches the ultimate cost trend rate	2023		2023	2030	2030
Post-65
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate			8.80%	7.50%	7.50%
Ultimate cost trend rate			4.50%	5.40%	5.40%
Year that the rate reaches the ultimate cost trend rate	2024		2024	2030	2030
Defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate			3.80%	4.70%	4.00%
Weighted average rate of future compensation increases			3.80%	3.80%	3.80%
Long-term rate of return on plan assets	6.80%	7.50%		8.00%	8.00%
Postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate			3.80%	4.70%	4.00%
Annual increase in Medicare Part B premium			6.00%	6.00%	6.00%

X

- Definition

Annual increase in Medicare Part B premium used to determine net periodic benefit cost for domestic postretirement benefit plans.

+ References

No definition available.

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- Definition

Health Care Cost Trend Rate used to Determine Net Period Benefit Cost

+ References

No definition available.

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- Definition

The interest rate used to adjust for the time value of money.

+ 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

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512013

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-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

The ultimate trend rate for health care costs.

+ 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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- 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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