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Financial Assets at Fair Value through Other Comprehensive Income Noncurrent - Summary of Financial Assets at Fair Value through Other Comprehensive Income Noncurrent (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure of financial assets [Line Items]      
Financial assets at fair value through other comprehensive income $ 7,193 $ 256 $ 7,154
Domestic listed stocks [Member]      
Disclosure of financial assets [Line Items]      
Financial assets at fair value through other comprehensive income 2,754   2,454
Domestic non-listed stocks [Member]      
Disclosure of financial assets [Line Items]      
Financial assets at fair value through other comprehensive income 4,325   4,566
Foreign non-listed stocks [Member]      
Disclosure of financial assets [Line Items]      
Financial assets at fair value through other comprehensive income $ 114   $ 134