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Other Gains and Losses, Net (Tables)

12 Months Ended

Dec. 31, 2020

Text Block [Abstract]

Summary of Other Gains and Losses


		Years Ended December 31
		2018				2019				2020
		NT$				NT$				NT$
		(In Millions)				(In Millions)				(In Millions)

Gain (loss) on disposal of financial assets, net
Investments in debt instruments at FVTOCI		$	(989.1	)		$	537.8			$	1,439.4
Loss on disposal of subsidiaries			—				(4.6	)			—
Gain (loss) on financial instruments at FVTPL, net
Mandatorily measured at FVT P L			(2,293.9	)			(2,360.7	)			8,244.5
Gain (loss) arising from fair value hedges, net			(2.3	)			13.1				—
The reversal (accrual) of expected credit loss of financial assets
Investments in debt instruments at FVTOCI			2.0				(6.9	)			0.9
Financial assets at amortized cost			0.4				5.2				(4.6	)
Other gains (losses), net			(127.9	)			665.1				426.2


		$	(3,410.8	)		$	(1,151.0	)		$	10,106.4