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Retirement Benefit Plans - Summary of Sensitivity Analysis (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 TWD ($) yr	Dec. 31, 2016 TWD ($) yr
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
The expected contributions to the plan for the next year | $	$ 4,393	$ 2,724
Bottom of range [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
The average duration of the defined benefit obligation	6	7
Top of range [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
The average duration of the defined benefit obligation	13	14

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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

No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2016-01-13
-Paragraph 147
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_147_b&doctype=Standard
-URIDate 2016-03-31

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2016-01-13
-Paragraph 148
-Subparagraph d
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_148_d_iii&doctype=Standard
-URIDate 2016-03-31

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- Definition

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 19
-IssueDate 2016-01-13
-Paragraph 147
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_147_c&doctype=Standard
-URIDate 2016-03-31

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