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Investments Accounted for Using Equity Method - Summarized Financial Information of Associates (Systems on Silicon Manufacturing Company Pte Ltd.) (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Dec. 31, 2017
USD ($)
Disclosure of associates [line items]          
Current assets $ 857,203.1   $ 817,729.1   $ 28,920.5
Noncurrent assets 1,134,528.9   1,068,567.6   38,276.9
Current liabilities 386,890.2   348,286.0   13,053.0
Noncurrent liabilities 110,395.3   178,164.9   $ 3,724.5
NET REVENUE 977,447.2 $ 32,977.3 947,938.3 $ 843,497.4  
Total comprehensive income $ 316,217.4 $ 10,668.6 320,730.1 288,118.7  
Systems on Silicon Manufacturing Company Pte Ltd. [member]          
Disclosure of associates [line items]          
Current assets     14,585.1    
Noncurrent assets     5,360.1    
Current liabilities     1,746.6    
Noncurrent liabilities     286.3    
NET REVENUE     14,045.9 15,026.0  
Income from operations     4,921.7 5,802.3  
Net income     4,918.1 5,904.6  
Total comprehensive income     4,918.1 5,904.6  
Cash dividends received     $ 4,076.2 $ 1,556.6