Financial Instruments at Fair Value Through Profit or Loss (Tables)

12 Months Ended

Dec. 31, 2022

Disclosure Of Financial Instruments At Fair Value Through Profit Or Loss [Abstract]

Summary of Financial Instruments at Fair Value through Profit or Loss

	December 31
	2021		2022
	NT$		NT$
	(In Millions)
Financial assets-current
Mandatorily measured at FVTPL
Derivatives (not designated for hedge)
Forward exchange contracts	$	—	$	3
Non-derivatives
Listed stocks - domestic		3		1
	$	3	$	4
Financial assets-noncurrent
Mandatorily measured at FVTPL
Non-derivatives
Non-listed stocks - domestic	$	648	$	758
Non-listed stocks - foreign		237		103
Limited partnership - domestic		24		135
Film and drama investing agreements		—		24
	$	909	$	1,020
Financial liabilities-current
Held for trading
Derivatives (not designated for hedge)
Forward exchange contracts	$	6	$	—

Disclosure of Detailed Information Outstanding Derivative Contracts Not Designated for Hedge Explanatory

Outstanding forward exchange contracts not designated for hedge as of balance sheet dates were as follows:

		Maturity	Contract Amount
	Currency	Period	(In Millions)
December 31, 2021
Forward exchange contracts - buy	NT$/EUR	2022.03	NT$257/EUR8
December 31, 2022
Forward exchange contracts - buy	NT$/EUR	2023.03	NT$62/EUR2