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Employee Bargaining Agreements and Benefit Plans - Assumption Rates Used for Benefit Obligations (Detail)	Dec. 31, 2021	Dec. 31, 2020
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate:	1.20%	0.70%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate:	1.80%	1.20%

X

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

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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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- Details

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X

- Details

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