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Guarantee Deposits - Summary of Guarantee Deposits (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Guarantee deposits [abstract]      
Capacity guarantee $ 13,346.6   $ 20,929.3
Receivables guarantee 2,427.5   5,560.0
Others 306.5   181.3
Guarantee deposits 16,080.6   26,670.6
Current portion (classified under accrued expenses and other current liabilities) 8,493.8   12,000.2
Noncurrent portion 7,586.8 $ 255.9 14,670.4
Guarantee deposits $ 16,080.6   $ 26,670.6