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Retirement Benefit Obligations - Summary of Sensitivity Analysis (Parenthetical) (Detail) - Retirement Benefit Obligations [member]	12 Months Ended
	Dec. 31, 2021
Actuarial Assumption of Discount Rates, Increase by 0.25% [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Actuarial assumption rate, increase	0.25%
Actuarial Assumption of Discount Rates, Decrease by 0.25% [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Actuarial assumption rate, decrease	0.25%
Actuarial Assumption of Expected Rates of Inflation, Increase by 0.25% [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Actuarial assumption rate, increase	0.25%
Actuarial Assumption of Expected Rates of Inflation, Decrease by 0.25% [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Actuarial assumption rate, decrease	0.25%
Acturial assumption of mortality rate Increase by 1 year [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Mortality assumption	Increase by 1 year
Acturial assumption of mortality rate Decrease by 1 year [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Mortality assumption	Decrease by 1 year

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- Definition

The description of the methods and assumptions used when preparing a sensitivity analysis for significant actuarial assumptions. [Refer: Actuarial assumptions [member]]

+ References

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The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

+ References

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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]]

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