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Financial Assets and Liabilities at Fair Value through Profit or Loss (Tables)

12 Months Ended

Dec. 31, 2018

Statement [LineItems]

Summary of Financial Assets and Liabilities at Fair Value through Profit or Loss

		December 31, 2017				December 31, 2018
		NT$				NT$
		(In Millions)				(In Millions)
Financial assets
Mandatorily measured at FVTPL
Agency mortgage-backed securities		$	—			$	3,419.3
Forward exchange contracts			—				85.3
			—				3,504.6
Held for trading
Forward exchange contracts			569.8				—
		$	569.8			$	3,504.6
Financial liabilities
Held for trading
Forward exchange contracts		$	26.7			$	40.8

Forward exchange contracts [member]

Statement [LineItems]

Outstanding Derivative Contracts for which Hedge Accounting Treatment is not Applied

Outstanding forward exchange contracts consisted of the following:

				Contract Amount
		Maturity Date		(In Millions)
December 31, 2017
Sell NT$/Buy EUR		January 2018 to February 2018		NT$6,002.8/EUR169.0
Sell NT$/Buy JPY		February 2018		NT$996.3/JPY3,800.0
Sell US$/Buy JPY		January 2018		US$2.2/JPY246.7
Sell US$/Buy RMB		January 2018		US$558.0/RMB3,679.6
Sell US$/Buy NT$		January 2018 to February 2018		US$1,661.5/NT$49,673.3
Sell RMB /Buy EUR		January 2018		RMB39.0/EUR5.0
Sell RMB/Buy JPY		January 2018		RMB409.7/JPY7,062.5
Sell RMB/Buy GBP		January 2018		RMB3.6/GBP0.4
December 31, 2018
Sell NT$/Buy EUR		January 2019 to March 2019		NT$18,545.9/EUR527.0
Sell NT$/Buy JPY		January 2019 to March 2019		NT$4,757.9/JPY17,200.0
Sell US$/Buy EUR		January 2019		US$0.5/EUR0.4
Sell US$/Buy JPY		January 2019		US$175.6/JPY19,389.0
Sell US$/Buy RMB		January 2019		US$318.0/RMB2,188.7
Sell US$/Buy NT$		January 2019 to February 2019		US$127.0/NT$3,908.6
Sell RMB/Buy US$		January 2019		RMB667.5/ US$97.0

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- Definition

The disclosure of derivative financial instruments. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 10
-Subparagraph e
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-URIDate 2018-03-16

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