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Income Tax - Movements of Deferred Income Tax Assets and Liabilities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income tax [Line Items]      
Recognized in Profit or Loss $ 81 $ 63 $ (208)
Recognized in Other Comprehensive Income (239) (305) 450
Deferred tax asset [Member]      
Income tax [Line Items]      
Beginning balance 3,259 3,554 2,730
Effect of Retrospective Application of IFRS 16   26  
Acquired by business combinations (Note 14) 6    
Recognized in Profit or Loss 107 (16) 374
Recognized in Other Comprehensive Income (239) (305) 450
Ending balance 3,133 3,259 3,554
Deferred tax asset [Member] | Allowance for doubtful receivables over quota [Member]      
Income tax [Line Items]      
Beginning balance 404 435 289
Recognized in Profit or Loss (39) (31) 146
Ending balance 365 404 435
Deferred tax asset [Member] | Share of profits of associates and joint ventures accounted for using equity method [Member]      
Income tax [Line Items]      
Beginning balance 402 389 331
Recognized in Profit or Loss (1) 13 58
Ending balance 401 402 389
Deferred tax asset [Member] | Defined benefit pension plans [Member]      
Income tax [Line Items]      
Beginning balance 2,034 2,307 1,723
Acquired by business combinations (Note 14) 1    
Recognized in Profit or Loss 20 32 134
Recognized in Other Comprehensive Income (239) (305) 450
Ending balance 1,816 2,034 2,307
Deferred tax asset [Member] | Valuation loss on inventory [Member]      
Income tax [Line Items]      
Beginning balance 141 88 23
Acquired by business combinations (Note 14) 3    
Recognized in Profit or Loss 155 53 65
Ending balance 299 141 88
Deferred tax asset [Member] | Deferred revenue [Member]      
Income tax [Line Items]      
Beginning balance 98 111 106
Recognized in Profit or Loss (25) (13) 5
Ending balance 73 98 111
Deferred tax asset [Member] | Estimated warranty liabilities [Member]      
Income tax [Line Items]      
Beginning balance 34 26 22
Recognized in Profit or Loss 2 8 4
Ending balance 36 34 26
Deferred tax asset [Member] | Accrued award credits liabilities [Member]      
Income tax [Line Items]      
Beginning balance 17 14 15
Recognized in Profit or Loss 1 3 (1)
Ending balance 18 17 14
Deferred tax asset [Member] | Others [Member]      
Income tax [Line Items]      
Beginning balance 101 143 175
Effect of Retrospective Application of IFRS 16   26  
Acquired by business combinations (Note 14) 2    
Recognized in Profit or Loss 2 (68) (32)
Ending balance 105 101 143
Deferred tax asset [Member] | Temporary differences [Member]      
Income tax [Line Items]      
Beginning balance 3,231 3,513 2,684
Effect of Retrospective Application of IFRS 16   26  
Acquired by business combinations (Note 14) 6    
Recognized in Profit or Loss 115 (3) 379
Recognized in Other Comprehensive Income (239) (305) 450
Ending balance 3,113 3,231 3,513
Deferred tax asset [Member] | Unused tax losses [Member]      
Income tax [Line Items]      
Beginning balance 28 41 46
Recognized in Profit or Loss (8) (13) (5)
Ending balance 20 28 41
Deferred tax liability [Member]      
Income tax [Line Items]      
Beginning balance (1,912) (1,992) (1,430)
Effect of Retrospective Application of IFRS 9     1
Acquired by business combinations (Note 14) (3)    
Recognized in Profit or Loss (52) 80 (563)
Ending balance (1,967) (1,912) (1,992)
Deferred tax liability [Member] | Defined benefit pension plans [Member]      
Income tax [Line Items]      
Beginning balance (1,758) (1,832) (1,265)
Recognized in Profit or Loss (54) 74 (567)
Ending balance (1,812) (1,758) (1,832)
Deferred tax liability [Member] | Others [Member]      
Income tax [Line Items]      
Beginning balance (1) (2) (2)
Effect of Retrospective Application of IFRS 9     1
Acquired by business combinations (Note 14) (3)    
Recognized in Profit or Loss 1 1 (1)
Ending balance (3) (1) (2)
Deferred tax liability [Member] | Land value incremental tax [Member]      
Income tax [Line Items]      
Beginning balance (95) (95) (95)
Ending balance (95) (95) (95)
Deferred tax liability [Member] | Deferred revenue for award credits [Member]      
Income tax [Line Items]      
Beginning balance (29) (31) (29)
Recognized in Profit or Loss (1) 2 (2)
Ending balance (30) (29) (31)
Deferred tax liability [Member] | Intangible assets and goodwill [member]      
Income tax [Line Items]      
Beginning balance (29) (32) (39)
Recognized in Profit or Loss 2 3 7
Ending balance $ (27) $ (29) $ (32)