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Retirement Benefit Plans - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of defined benefit plans [line items]
Employer contribution percentage, defined contribution plans	6.00%
Defined contribution plans expense	$ 2,568.9	$ 2,369.9	$ 2,164.9
Employer contribution percentage, defined benefit plans	2.00%
Defined benefit plans contribution in the next year	$ 233.5
Weighted average duration of the defined benefit obligation	13 years
Actuarial assumption of discount rates [member]
Disclosure of defined benefit plans [line items]
Percentage of decrease in discount rate	0.50%
Amount of increase in defined benefit obligation	$ 921.8	890.1
Actuarial assumption of expected rates of salary increases [member]
Disclosure of defined benefit plans [line items]
Percentage of increase in discount rate	0.50%
Amount of increase in defined benefit obligation	$ 901.6	$ 873.8

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

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- Definition

The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]]

+ References

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [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]]

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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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The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

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Defined benefit plans employer contribution percentage.

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Defined contribution plans employer contribution percentage.

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Weighted average duration of defined benefit obligations.

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