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Income Tax - Movements of Deferred Income Tax Assets and Liabilities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income tax [Line Items]      
Recognized in Profit or Loss $ (489) $ 81 $ 63
Recognized in Other Comprehensive Income (78) (239) (305)
Deferred tax asset [Member]      
Income tax [Line Items]      
Beginning balance 3,133 3,259 3,580
Acquired by business combinations (Note 14)   6  
Recognized in Profit or Loss (270) 107 (16)
Recognized in Other Comprehensive Income (78) (239) (305)
Ending balance 2,785 3,133 3,259
Deferred tax asset [Member] | Defined benefit pension plans [Member]      
Income tax [Line Items]      
Beginning balance 1,816 2,034 2,307
Acquired by business combinations (Note 14)   1  
Recognized in Profit or Loss 6 20 32
Recognized in Other Comprehensive Income (78) (239) (305)
Ending balance 1,744 1,816 2,034
Deferred tax asset [Member] | Share of profit or loss of associates and joint ventures accounted for using equity method [Member]      
Income tax [Line Items]      
Beginning balance 401 402 389
Recognized in Profit or Loss   (1) 13
Ending balance 401 401 402
Deferred tax asset [Member] | Allowance for doubtful receivables over quota [Member]      
Income tax [Line Items]      
Beginning balance 365 404 435
Recognized in Profit or Loss (100) (39) (31)
Ending balance 265 365 404
Deferred tax asset [Member] | Valuation loss on inventory [Member]      
Income tax [Line Items]      
Beginning balance 299 141 88
Acquired by business combinations (Note 14)   3  
Recognized in Profit or Loss (102) 155 53
Ending balance 197 299 141
Deferred tax asset [Member] | Deferred revenue [Member]      
Income tax [Line Items]      
Beginning balance 73 98 111
Recognized in Profit or Loss (24) (25) (13)
Ending balance 49 73 98
Deferred tax asset [Member] | Others [Member]      
Income tax [Line Items]      
Beginning balance 90 105 178
Acquired by business combinations (Note 14)   2  
Recognized in Profit or Loss (15) (17) (73)
Ending balance 75 90 105
Deferred tax asset [Member] | Estimated warranty liabilities [Member]      
Income tax [Line Items]      
Beginning balance 36 34 26
Recognized in Profit or Loss 7 2 8
Ending balance 43 36 34
Deferred tax asset [Member] | Valuation loss (gain) on financial instruments [Member]      
Income tax [Line Items]      
Beginning balance 33 13 5
Recognized in Profit or Loss (33) 20 8
Ending balance   33 13
Deferred tax asset [Member] | Temporary differences [Member]      
Income tax [Line Items]      
Beginning balance 3,113 3,231 3,539
Acquired by business combinations (Note 14)   6  
Recognized in Profit or Loss (261) 115 (3)
Recognized in Other Comprehensive Income (78) (239) (305)
Ending balance 2,774 3,113 3,231
Deferred tax asset [Member] | Unused tax losses [Member]      
Income tax [Line Items]      
Beginning balance 20 28 41
Recognized in Profit or Loss (9) (8) (13)
Ending balance 11 20 28
Deferred Tax Liability      
Income tax [Line Items]      
Beginning balance (1,967) (1,912) (1,992)
Acquired by business combinations (Note 14)   (3)  
Recognized in Profit or Loss (222) (52) 80
Ending balance (2,189) (1,967) (1,912)
Deferred Tax Liability | Defined benefit pension plans [Member]      
Income tax [Line Items]      
Beginning balance (1,812) (1,758) (1,832)
Recognized in Profit or Loss (157) (54) 74
Ending balance (1,969) (1,812) (1,758)
Deferred Tax Liability | Others [Member]      
Income tax [Line Items]      
Beginning balance (3)   (1)
Acquired by business combinations (Note 14)   (3)  
Recognized in Profit or Loss (1)   1
Ending balance (4) (3)  
Deferred Tax Liability | Valuation loss (gain) on financial instruments [Member]      
Income tax [Line Items]      
Recognized in Profit or Loss (16)    
Ending balance (16)    
Deferred Tax Liability | Land value incremental tax [Member]      
Income tax [Line Items]      
Beginning balance (95) (95) (95)
Ending balance (95) (95) (95)
Deferred Tax Liability | Intangible assets [member]      
Income tax [Line Items]      
Beginning balance (27) (29) (32)
Recognized in Profit or Loss 3 2 3
Ending balance (24) (27) (29)
Deferred Tax Liability | Deferred revenue for award credits [Member]      
Income tax [Line Items]      
Beginning balance (30) (29) (31)
Recognized in Profit or Loss (25) (1) 2
Ending balance (55) (30) (29)
Deferred Tax Liability | Unrealized foreign exchange gain, net [Member]      
Income tax [Line Items]      
Beginning balance   (1) (1)
Recognized in Profit or Loss (26) $ 1  
Ending balance $ (26)   $ (1)