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Available-for-sale Financial Assets - Summary of Available-for-sale Financial Assets (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure of financial assets [line items]      
Financial assets available-for-sale $ 98,248.5   $ 71,891.3
Current portion 93,374.2 $ 3,150.3 67,788.8
Noncurrent portion 4,874.3 $ 164.5 4,102.5
Corporate bonds [member]      
Disclosure of financial assets [line items]      
Financial assets available-for-sale 40,165.2   29,999.5
Agency bonds/Agency mortgage-backed securities [member]      
Disclosure of financial assets [line items]      
Financial assets available-for-sale 29,235.4   14,880.5
Asset-backed securities [Member]      
Disclosure of financial assets [line items]      
Financial assets available-for-sale 13,459.5   11,254.7
Government bonds [member]      
Disclosure of financial assets [line items]      
Financial assets available-for-sale 7,817.7   8,457.4
Publicly traded stocks [member]      
Disclosure of financial assets [line items]      
Financial assets available-for-sale 2,548.1   3,196.7
Non-publicly traded stocks [member]      
Disclosure of financial assets [line items]      
Financial assets available-for-sale 2,532.3   2,944.9
Mutual funds [member]      
Disclosure of financial assets [line items]      
Financial assets available-for-sale 2,342.0   $ 1,157.6
Commercial paper [member]      
Disclosure of financial assets [line items]      
Financial assets available-for-sale $ 148.3