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Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

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Summary of Intangible Assets


		Goodwill				Technology License Fees				Software and System Design Costs				Patent and Others				Total
		NT$				NT$				NT$				NT$				NT$
		(In Millions)				(In Millions)				(In Millions)				(In Millions)				(In Millions)
Cost
Balance at January 1, 2015		$	5,888.8			$	6,350.3			$	18,697.1			$	4,292.5			$	35,228.7
Additions			—				2,112.5				867.8				587.8				3,568.1
Retirements			—				—				(101.4	)			—				(101.4	)
Effect of acquisition of subsidiary			52.7				—				12.1				—				64.8
Effect of exchange rate changes			163.3				(8.5	)			(1.2	)			(1.3	)			152.3


Balance at December 31, 2015		$	6,104.8			$	8,454.3			$	19,474.4			$	4,879.0			$	38,912.5


Accumulated amortization and impairment
Balance at January 1, 2015		$	—			$	3,778.9			$	14,861.1			$	3,057.2			$	21,697.2
Additions			—				950.9				1,672.6				578.7				3,202.2
Retirements			—				—				(101.4	)			—				(101.4	)
Impairment			—				58.1				0.4				—				58.5
Effect of exchange rate changes			—				(8.5	)			(1.1	)			(0.3	)			(9.9	)


Balance at December 31, 2015		$	—			$	4,779.4			$	16,431.6			$	3,635.6			$	24,846.6


Carrying amounts at December 31, 2015		$	6,104.8			$	3,674.9			$	3,042.8			$	1,243.4			$	14,065.9


Cost
Balance at January 1, 2016		$	6,104.8			$	8,454.3			$	19,474.4			$	4,879.0			$	38,912.5
Additions			—				1,091.3				2,788.5				519.3				4,399.1
Retirements			—				—				(5.2	)			—				(5.2	)
Effect of exchange rate changes			(96.8	)			0.4				(14.1	)			(11.9	)			(122.4	)


Balance at December 31, 2016		$	6,008.0			$	9,546.0			$	22,243.6			$	5,386.4			$	43,184.0


Accumulated amortization and impairment
Balance at January 1, 2016		$	—			$	4,779.4			$	16,431.6			$	3,635.6			$	24,846.6
Additions			—				1,367.4				1,730.8				645.2				3,743.4
Retirements			—				—				(5.2	)			—				(5.2	)
Effect of exchange rate changes			—				0.4				(12.7	)			(3.3	)			(15.6	)


Balance at December 31, 2016		$	—			$	6,147.2			$	18,144.5			$	4,277.5			$	28,569.2


Carrying amounts at December 31, 2016		$	6,008.0			$	3,398.8			$	4,099.1			$	1,108.9			$	14,614.8


		Goodwill				Technology License Fees				Software and System Design Costs				Patent and Others				Total
		NT$				NT$				NT$				NT$				NT$
		(In Millions)				(In Millions)				(In Millions)				(In Millions)				(In Millions)
Cost
Balance at January 1, 2017		$	6,008.0			$	9,546.0			$	22,243.6			$	5,386.4			$	43,184.0
Additions			—				897.9				3,021.1				349.2				4,268.2
Retirements			—				—				(75.2	)			—				(75.2	)
Reclassification			—				—				7.7				(18.0	)			(10.3	)
Effect of disposal of subsidiary			(13.5	)			—				(7.7	)			—				(21.2	)
Effect of exchange rate changes			(345.8	)			(0.6	)			(3.2	)			(1.6	)			(351.2	)


Balance at December 31, 2017		$	5,648.7			$	10,443.3			$	25,186.3			$	5,716.0			$	46,994.3


Accumulated amortization and impairment
Balance at January 1, 2017		$	—			$	6,147.2			$	18,144.5			$	4,277.5			$	28,569.2
Additions			—				1,548.3				2,310.7				487.7				4,346.7
Retirements			—				—				(75.2	)			—				(75.2	)
Reclassification			—				—				7.4				(17.1	)			(9.7	)
Impairment			13.5				—				—				—				13.5
Effect of disposal of subsidiary			(13.5	)			—				(7.6	)			—				(21.1	)
Effect of exchange rate changes			—				(0.6	)			(3.1	)			(0.6	)			(4.3	)


Balance at December 31, 2017		$	—			$	7,694.9			$	20,376.7			$	4,747.5			$	32,819.1


Carrying amounts at December 31, 2017		$	5,648.7			$	2,748.4			$	4,809.6			$	968.5			$	14,175.2