Retirement Plans - Weighted Average Assumptions Used to Determine Benefit Obligation (Detail)	Dec. 31, 2021	Dec. 31, 2020
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.70%	2.40%
Interest crediting rate for cash balance plans	2.30%	2.40%
OPEB
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend, Ultimate	4.00%	4.50%
Discount rate	2.70%	2.20%
Pre-Age 65 \| OPEB
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend, Current	5.00%	6.20%
Post-Age 65 \| OPEB
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend, Current	5.00%	6.20%

Defined benefit plan assumptions used interest crediting rate for cash balance plans.

No definition available.

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- 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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- 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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- Definition

Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

+ 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 (l)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement 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 (l)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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