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Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

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, 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

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


Cost
Balance at January 1, 2018		$	5,648.7			$	10,443.3			$	25,186.3			$	5,716.0			$	46,994.3
Additions			—				533.7				4,601.9				1,969.4				7,105.0
Disposals or retirements			—				—				(186.7	)			(31.2	)			(217.9	)
Effect of exchange rate changes			146.8				(2.5	)			(6.9	)			2.1				139.5


Balance at December 31, 2018		$	5,795.5			$	10,974.5			$	29,594.6			$	7,656.3			$	54,020.9


Accumulated amortization and impairment
Balance at January 1, 2018		$	—			$	7,694.9			$	20,376.7			$	4,747.5			$	32,819.1
Additions			—				1,063.6				2,835.3				522.5				4,421.4
Disposals or retirements			—				—				(186.6	)			(31.2	)			(217.8	)
Effect of exchange rate changes			—				(2.5	)			(1.7	)			0.3				(3.9	)


Balance at December 31, 2018		$	—			$	8,756.0			$	23,023.7			$	5,239.1			$	37,018.8


Carrying amounts at December 31, 2018		$	5,795.5			$	2,218.5			$	6,570.9			$	2,417.2			$	17,002.1