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Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Financial Assets at Fair Value through Other Comprehensive Income (Detail)
$ in Millions, $ in Millions
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Disclosure of financial assets [line items]      
Current $ 127,396.6   $ 99,561.7
Non current 4,124.3 $ 137.9 3,910.7
Investment in equity and debt instruments at FVTOCI 131,520.9   103,472.4
Debt securities [member]      
Disclosure of financial assets [line items]      
Investments in debt instruments at FVTOCI 127,396.6   98,971.6
Debt securities [member] | Agency bonds/Agency mortgage-backed securities [member]      
Disclosure of financial assets [line items]      
Investments in debt instruments at FVTOCI 51,966.5   31,288.8
Debt securities [member] | Corporate bonds [member]      
Disclosure of financial assets [line items]      
Investments in debt instruments at FVTOCI 51,790.0   40,753.6
Debt securities [member] | Government bonds [member]      
Disclosure of financial assets [line items]      
Investments in debt instruments at FVTOCI 12,824.2   11,151.3
Debt securities [member] | Asset-backed securities [Member]      
Disclosure of financial assets [line items]      
Investments in debt instruments at FVTOCI 10,815.9   15,670.3
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 4,124.3   4,500.8
Equity instruments [member] | Non-publicly traded stocks [member]      
Disclosure of financial assets [line items]      
Investment in equity instruments at FVTOCI $ 4,124.3   3,910.7
Equity instruments [member] | Publicly traded stocks [member]      
Disclosure of financial assets [line items]      
Investment in equity instruments at FVTOCI     $ 590.1