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Pledged Assets - Assets Pledged as Collaterals (Detail) - TWD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Subclassifications Of Assets Liabilities And Equities [Abstract]    
Property, plant and equipment $ 2,550 $ 2,580
Land held under development (included in inventories) 1,999 1,999
Restricted assets (included in other assets - others) 3 21
Assets pledged as collateral $ 4,552 $ 4,600