XML 110 R97.htm IDEA: XBRL DOCUMENT v3.19.1
Financial Assets at Fair Value Through Other Comprehensive Income-2018 - Summary of Financial Assets at Fair Value through Other Comprehensive Income (Detail) - Dec. 31, 2018
$ in Millions, $ in Millions
TWD ($)
USD ($)
Disclosure of financial assets [line items]    
Current $ 99,561.7  
Non current 3,910.7 $ 127.8
Investment in equity and debt instruments at FVTOCI 103,472.4  
Debt securities [member]    
Disclosure of financial assets [line items]    
Investments in debt instruments at FVTOCI 98,971.6  
Debt securities [member] | Corporate bonds [member]    
Disclosure of financial assets [line items]    
Investments in debt instruments at FVTOCI 40,753.6  
Debt securities [member] | Agency bonds/Agency mortgage-backed securities [member]    
Disclosure of financial assets [line items]    
Investments in debt instruments at FVTOCI 31,288.8  
Debt securities [member] | Asset-backed securities [Member]    
Disclosure of financial assets [line items]    
Investments in debt instruments at FVTOCI 15,670.3  
Debt securities [member] | Government bonds [member]    
Disclosure of financial assets [line items]    
Investments in debt instruments at FVTOCI 11,151.3  
Debt securities [member] | Commercial paper [member]    
Disclosure of financial assets [line items]    
Investments in debt instruments at FVTOCI 107.6  
Equity instruments [member]    
Disclosure of financial assets [line items]    
Investment in equity instruments at FVTOCI 4,500.8  
Equity instruments [member] | Non-publicly traded stocks [member]    
Disclosure of financial assets [line items]    
Investment in equity instruments at FVTOCI 3,910.7  
Equity instruments [member] | Publicly traded stocks [member]    
Disclosure of financial assets [line items]    
Investment in equity instruments at FVTOCI $ 590.1