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Operating Segments Information (Tables)

12 Months Ended

Dec. 31, 2019

TextBlock [abstract]

Geographic Information

1) Geographic information

		Net Revenue from External Customers
		Year Ended				Noncurrent Assets
		December 31				December 31,
		2017				2018				2019
		NT$				NT$				NT$
		(In Millions)				(In Millions)				(In Millions)
Taiwan		$	88,046.1			$	1,039,471.3			$	1,344,352.6
United States			635,851.7				7,569.8				8,850.1
China			110,201.4				43,574.5				38,586.6
Europe, the Middle East and Africa			69,046.8				8.3				186.2
Japan			60,628.0				13.1				27.1
Others			13,673.2				—				3.1
		$	977,447.2			$	1,090,637.0			$	1,392,005.7

Production Information

2) Product information

		Year Ended December 31
		2017
		NT$
Product		(In Millions)
Wafer		$	875,461.4
Others			101,985.8
		$	977,447.2

Major Customers Representing at Least 10% of Net Revenue

3) Major customers representing at least 10% of net revenue

		Years Ended December 31
		2017								2018								2019
		Amount				%				Amount				%				Amount				%
		NT$								NT$								NT$
		(In Millions)								(In Millions)								(In Millions)
Customer A		$	220,463.1				23			$	224,690.7				22			$	247,213.3				23
Customer B			46,355.5				5				83,885.6				8				152,876.9				14

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