XML 193 R175.htm IDEA: XBRL DOCUMENT v3.8.0.1
Operating Segments Information - Segment Revenue and Operating Results (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Disclosure of operating segments [line items]        
Net revenue from external customers $ 977,447.2 $ 32,977.3 $ 947,938.3 $ 843,497.4
Share of profits (loss) of associates and joint venture 3,014.8 101.7 3,457.9 4,196.4
Income tax expense (benefit) $ 51,122.9 $ 1,724.8 $ 54,124.4 47,644.7
Elimination [member]        
Disclosure of operating segments [line items]        
Net revenue from external customers       843,497.4
Income (loss) from operations       320,047.8
Share of profits (loss) of associates and joint venture       4,196.4
Income tax expense (benefit)       47,644.7
Foundry [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Net revenue from external customers       842,690.2
Income (loss) from operations       320,833.2
Share of profits (loss) of associates and joint venture       4,582.0
Income tax expense (benefit)       47,646.5
Others [member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Net revenue from external customers       807.2
Income (loss) from operations       (785.4)
Share of profits (loss) of associates and joint venture       (385.6)
Income tax expense (benefit)       $ (1.8)