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Financial Instruments - Remaining Contractual Maturity for Non-derivative Financial Liabilities (Detail) - TWD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Non-derivative financial liabilities	$ 51,422	$ 52,338
Less Than 1 Month [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Non-derivative financial liabilities	41,934	43,975
1-3 Months [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Non-derivative financial liabilities	0	38
3 Months to 1 Year [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Non-derivative financial liabilities	3,217	2,115
1-5 Years [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Non-derivative financial liabilities	6,271	6,210
Non-interest bearing [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Loans	49,752	50,600
Non-interest bearing [Member] | Less Than 1 Month [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Loans	41,884	43,975
Non-interest bearing [Member] | 3 Months to 1 Year [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Loans	3,197	2,015
Non-interest bearing [Member] | 1-5 Years [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Loans	4,671	4,610
Floating interest rate instruments [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Loans	$ 1,670	$ 1,738
Floating interest rate instruments [Member] | Weighted average [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Weighted Average Effective Interest Rate	0.97%	1.00%
Floating interest rate instruments [Member] | Less Than 1 Month [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Loans	$ 50	$ 0
Floating interest rate instruments [Member] | 1-3 Months [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Loans	0	38
Floating interest rate instruments [Member] | 3 Months to 1 Year [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Loans	20	100
Floating interest rate instruments [Member] | 1-5 Years [Member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Loans	$ 1,600	$ 1,600

X

- Definition

The amount of contractual undiscounted cash flows in relation to bank borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Note Effective 2019-01-01
-Name IFRS
-Number 7
-IssueDate 2016-01-13
-Paragraph IG31A
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-URIDate 2016-03-31

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- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2016-01-13
-Paragraph 7
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+ References

No definition available.

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- Definition

The amount of contractual undiscounted cash flows in relation to non-derivative financial liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2016-01-13
-Paragraph 39
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_39_a&doctype=Standard
-URIDate 2016-03-31

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- Definition

The amount of contractual undiscounted cash flows in relation to trade and other payables. [Refer: Trade and other payables]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Note Effective 2019-01-01
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-IssueDate 2016-01-13
-Paragraph IG31A
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_IG31A&doctype=Implementation%20Guidance
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