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Investments Accounted for Using Equity Method - Summarized Financial Information of Associates (Vanguard International Semiconductor Corporation) (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  
Other comprehensive income (loss) (28,821.6) (972.4) (11,067.2) (14,714.2)  
Total comprehensive income $ 316,217.4 $ 10,668.6 320,730.1 288,118.7  
Vanguard International Semiconductor Corporation [member]          
Disclosure of associates [line items]          
Current assets     25,662.9    
Noncurrent assets     9,501.4    
Current liabilities     5,975.7    
Noncurrent liabilities     804.1    
NET REVENUE     25,828.6 23,319.7  
Income from operations     6,083.6 4,593.4  
Net income     5,389.6 4,253.9  
Other comprehensive income (loss)     5.6 (61.9)  
Total comprehensive income     5,395.2 4,192.0  
Cash dividends received     $ 1,207.0 $ 1,206.4