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Financial Instruments - Summary of Level 3 Fair Value Were Equity Investments classified as Financial Assets at FVTOCI (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Beginning balance $ 126,963.4    
Ending balance 125,407.2 $ 126,963.4  
Level 3 [member]      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Beginning balance 4,514.9 4,208.9 $ 3,910.7
Additions 319.2 175.2 372.3
Recognized in profit or loss   (3.8)  
Recognized in other comprehensive income or loss 1,821.8 409.0 129.5
Disposals and proceeds from return of capital of investments (700.2) (51.1) (76.5)
Transfers out of level 3 (Note)     (43.6)
Effect of exchange rate changes (67.8) (223.3) (83.5)
Ending balance $ 5,887.9 $ 4,514.9 $ 4,208.9