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Equity - Noncontrolling Interests (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Beginning balance $ 387,273   $ 384,272 $ 384,458
Profit Allocated to Noncontrolling Interests 1,431 $ 52 1,285 974
Income tax relating to remeasurements of defined benefit pension plans (78)   (239) (305)
Cash dividends distributed by subsidiaries (896)   (775) (710)
Share-based payment transactions of subsidiaries 73   89 21
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method 1   (2)  
Net increase (decrease) in noncontrolling interests     476 (1)
Ending balance 389,130 14,028 387,273 384,272
Noncontrolling interests [Member]        
Beginning balance 11,158   10,115 9,837
Profit Allocated to Noncontrolling Interests 1,431   1,285 974
Exchange differences arising from the translation of the foreign operations 0   (14) 8
Unrealized gain or loss on financial assets at FVOCI 2   (3) (26)
Remeasurements of defined benefit pension plans (5)   17 15
Income tax relating to remeasurements of defined benefit pension plans 1   (3) (3)
Share of other comprehensive loss of associates and joint ventures accounted for using equity method 0   (1) (1)
Cash dividends distributed by subsidiaries (896)   (775) (710)
Share-based payment transactions of subsidiaries 56   63 22
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries 0   0 0
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method 0   (2) 0
Net increase (decrease) in noncontrolling interests 0   476 (1)
Ending balance $ 11,747 $ 424 $ 11,158 $ 10,115