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Pension and Postretirement Benefit Obligations - Additional Information (Detail) - Pension Plans [Member]	6 Months Ended
	Jun. 30, 2019 USD ($) Benefit_Plan
Defined Benefit Plan Disclosure [Line Items]
Number of company-sponsored pension plans | Benefit_Plan	2
Entity contribution to pension plans during the period	$ 0
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit pension plan, contributions	1,000,000
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit pension plan, contributions	$ 2,000,000

X

- Definition

Defined pension plans number of pension plans.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921

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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

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Balance Type:	debit
Period Type:	duration

X

- 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.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of benefits for defined benefit plan expected to be paid in remainder of fiscal year.

+ References

No definition available.

+ Details

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- Details

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