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Disposal of Subsidiary - Consideration Received, Assets and Liabilities Transferred and Other Items Related to Disposal of Subsidiary (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
TWD ($)
Dec. 31, 2014
TWD ($)
Assets            
Cash and cash equivalents $ 553,391.7 $ 18,670.4 $ 541,253.8 $ 18,260.9 $ 562,688.9 $ 358,449.0
Inventories 73,880.7 2,492.6 48,682.2      
Other current assets 4,222.4 142.5 3,385.4      
Property, plant and equipment 1,062,542.3 35,848.3 997,777.7   853,470.3  
Intangible assets 14,175.2 478.2 14,614.8   14,065.9  
Others 7,205.5   4,885.8      
TOTAL 1,991,732.0 67,197.4 1,886,296.7      
Liabilities            
Accrued expenses and other current liabilities 65,588.4 2,212.8 36,581.6      
Total liabilities 497,285.5 16,777.5 526,450.9      
NON-CONTROLLING INTERESTS 699.7 23.6 795.1      
Less: Balance of cash and cash equivalents disposed of 553,391.7 $ 18,670.4 $ 541,253.8 $ 18,260.9 $ 562,688.9 $ 358,449.0
Disposal groups classified as held for sale [member]            
Disclosure Of Discontinued Operation [line items]            
Total consideration received 825.0          
Expenditure associated with consideration received (142.5)          
Net consideration received 682.5          
Assets            
Cash and cash equivalents 81.5          
Inventories 28.5          
Other current assets 91.3          
Property, plant and equipment 643.7          
Intangible assets 47.4          
Others 51.8          
TOTAL 944.2          
Liabilities            
Salary and bonus payable 38.2          
Accrued expenses and other current liabilities 68.1          
Net defined benefit liability 35.9          
Others 76.9          
Total liabilities 219.1          
Net assets disposed of 725.1          
Net consideration received 682.5          
Net assets disposed of (725.1)          
NON-CONTROLLING INTERESTS 42.6          
Gain/loss on disposal of subsidiary 0.0          
Net consideration received 682.5          
Less: Balance of cash and cash equivalents disposed of 81.5          
Net cash inflow arising from disposal of subsidiary $ 601.0