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Retirement Benefit Plans - Movements in Defined Benefit Obligation and Fair Value of Plan Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Jul. 01, 2020
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure Of Defined Plan [line items]          
Net defined benefit liability (asset) at beginning of period   $ 42   $ 1,377 $ 2,370
Current service cost   1,253   2,052 2,927
Interest expense/interest income   (5)   1 10
Amounts recognized in profit or loss   1,248   2,053 2,937
Remeasurement on the net defined benefit liability          
Return on plan assets (excluding amounts included in net interest)   (501)   (1,308) (1,338)
Actuarial (gains) losses recognized from changes in demographic assumptions   (434)     6
Actuarial (gains) losses recognized from changes in financial assumptions       590 647
Actuarial (gains) losses recognized from experience adjustments   545   (475) (842)
Amounts recognized in other comprehensive income   (390) $ (14) (1,193) (1,527)
Contributions from employer   (1,727)   (1,964) (2,099)
Benefits paid   0   0 0
Benefits paid directly by the Company   (276)   (263) (304)
Acquired by business combinations (Note 14) $ 32        
Net defined benefit liability (asset) at end of period   (1,103)   42 1,377
Present value of funded defined benefit obligation [Member]          
Disclosure Of Defined Plan [line items]          
Net defined benefit liability (asset) at beginning of period   39,536   41,197 41,397
Current service cost   1,253   2,052 2,927
Interest expense/interest income   190   298 400
Amounts recognized in profit or loss   1,443   2,350 3,327
Remeasurement on the net defined benefit liability          
Return on plan assets (excluding amounts included in net interest)   0   0 0
Actuarial (gains) losses recognized from changes in demographic assumptions   (434)     6
Actuarial (gains) losses recognized from changes in financial assumptions       590 647
Actuarial (gains) losses recognized from experience adjustments   545   (475) (842)
Amounts recognized in other comprehensive income   111   115 (189)
Contributions from employer   0   0 0
Benefits paid   (5,312)   (3,919) (3,034)
Benefits paid directly by the Company   (276)   (263) (304)
Acquired by business combinations (Note 14) 56        
Net defined benefit liability (asset) at end of period   35,502   39,536 41,197
Fair value of plan assets [Member]          
Disclosure Of Defined Plan [line items]          
Net defined benefit liability (asset) at beginning of period   39,494   39,820 39,027
Current service cost   0   0 0
Interest expense/interest income   195   297 390
Amounts recognized in profit or loss   195   297 390
Remeasurement on the net defined benefit liability          
Return on plan assets (excluding amounts included in net interest)   501   1,308 1,338
Actuarial (gains) losses recognized from changes in demographic assumptions   0     0
Actuarial (gains) losses recognized from changes in financial assumptions       0 0
Actuarial (gains) losses recognized from experience adjustments   0   0 0
Amounts recognized in other comprehensive income   501   1,308 1,338
Contributions from employer   1,727   1,964 2,099
Benefits paid   (5,312)   (3,919) (3,034)
Benefits paid directly by the Company   0   0 0
Acquired by business combinations (Note 14) $ 24        
Net defined benefit liability (asset) at end of period   $ 36,605   $ 39,494 $ 39,820