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Weighted-Average Assumptions Used in Determining (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pension benefits | United States And Puerto Rico Nonqualified Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 3.62% | 4.09% |
Rate of compensation increase | 3.65% | 3.75% |
Discount rate | 4.09% | 4.36% | 4.00%
Expected return on plan assets | 6.50% | 7.00% | 7.25%
Rate of compensation increase | 3.75% | 3.75% | 3.76%
Pension benefits | International Unfunded Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 2.02% | 2.05% |
Rate of compensation increase | 3.05% | 3.08% |
Discount rate | 2.03% | 2.60% | 2.26%
Expected return on plan assets | 5.77% | 6.07% | 6.20%
Rate of compensation increase | 3.11% | 3.37% | 3.33%
OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Annual rate of increase in the per-capita cost | 6.25% | 6.25% |
Rate decreased to | 5.00% | 5.00% |
by the year ended | 2023 | 2022 |
Annual rate of increase in the per-capita cost | 6.25% | 6.50% | 6.00%
Rate decreased to | 5.00% | 5.00% | 5.00%
by the year ended | 2023 | 2022 | 2019
OPEB | United States And Puerto Rico Nonqualified Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 3.51% | 3.89% |
Discount rate | 3.89% | 4.12% | 3.95%

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- Definition Defined benefit plan assumptions used calculating net periodic benefit cost annual rate decrease in per capita cost. + References No definition available. + Details
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