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Postretirement Benefit Plans - Weighted-Average Assumptions used to Determine Benefit Obligations (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Other Postretirement Benefits Plan [Member] |  |
Obligation Assumptions: |  |
Discount rate | 2.40% | 3.20%
Cost Assumptions: |  |
Discount rate | 3.20% | 4.30%
Expected return on plan assets | 6.00% | 6.00%
International Plan [Member] | Pension Plan [Member] |  |
Obligation Assumptions: |  |
Discount rate | 0.70% | 1.00%
Rate of future compensation increase | 2.90% | 3.00%
Cost Assumptions: |  |
Discount rate | 1.00% | 1.70%
Expected return on plan assets | 1.00% | 1.00%
United States | Pension Plan [Member] |  |
Obligation Assumptions: |  |
Discount rate | 2.40% | 3.20%
Cost Assumptions: |  |
Discount rate | 3.20% | 4.30%
Expected return on plan assets | 4.00% | 6.00%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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