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Retirement Benefit Plans - Summary of Sensitivity of Defined Benefit Obligation to Changes in Weighted Average Assumptions (Detail) | Dec. 31, 2020 | Dec. 31, 2019
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Discount rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Change in Assumption | 1.00% | 1.00%
Increase in Assumption | (1200.00%) | (1200.00%)
Decrease in Assumption | 1400.00% | 1400.00%
Rate of increase in future compensation |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Change in Assumption | 1.00% | 1.00%
Increase in Assumption | 100.00% | 100.00%
Decrease in Assumption | (100.00%) | (100.00%)
Medical cost claim trend rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Change in Assumption | 1.00% | 1.00%
Increase in Assumption | 100.00% | 100.00%
Decrease in Assumption | (100.00%) | (100.00%)

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- Definition The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
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