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Income Tax - Movements of Deferred Income Tax Assets and Liabilities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income tax [Line Items]      
Recognized in Profit or Loss $ (218) $ (318) $ (489)
Deferred tax asset [Member]      
Income tax [Line Items]      
Beginning balance 2,197 2,785 3,133
Recognized in Profit or Loss (67) (357) (270)
Recognized in Other Comprehensive Income (31) (231) (78)
Ending balance 2,099 2,197 2,785
Deferred tax asset [Member] | Defined benefit pension plans [Member]      
Income tax [Line Items]      
Beginning balance 1,514 1,744 1,816
Recognized in Profit or Loss 1 1 6
Recognized in Other Comprehensive Income (31) (231) (78)
Ending balance 1,484 1,514 1,744
Deferred tax asset [Member] | Allowance for doubtful receivables over quota [Member]      
Income tax [Line Items]      
Beginning balance 184 265 365
Recognized in Profit or Loss (41) (81) (100)
Recognized in Other Comprehensive Income 0 0 0
Ending balance 143 184 265
Deferred tax asset [Member] | Valuation loss on inventory [Member]      
Income tax [Line Items]      
Beginning balance 105 197 299
Recognized in Profit or Loss (29) (92) (102)
Recognized in Other Comprehensive Income 0 0 0
Ending balance 76 105 197
Deferred tax asset [Member] | Seniority bonus [Member]      
Income tax [Line Items]      
Beginning balance 5 5 4
Recognized in Profit or Loss 64 0 1
Recognized in Other Comprehensive Income 0 0 0
Ending balance 69 5 5
Deferred tax asset [Member] | Impairment loss on assets [Member]      
Income tax [Line Items]      
Beginning balance 0 0 4
Recognized in Profit or Loss 60 0 (4)
Recognized in Other Comprehensive Income 0 0 0
Ending balance 60 0 0
Deferred tax asset [Member] | Estimated warranty liabilities [Member]      
Income tax [Line Items]      
Beginning balance 47 43 36
Recognized in Profit or Loss 1 4 7
Recognized in Other Comprehensive Income 0 0 0
Ending balance 48 47 43
Deferred tax asset [Member] | Valuation loss on financial assets [Member]      
Income tax [Line Items]      
Beginning balance (24) 0 (33)
Recognized in Profit or Loss (21) (24) 33
Recognized in Other Comprehensive Income 0 0 0
Ending balance (45) (24) 0
Deferred tax asset [Member] | Valuation Loss on Onerous Contracts [Member]      
Income tax [Line Items]      
Beginning balance 18 26 34
Recognized in Profit or Loss 19 (8) (8)
Recognized in Other Comprehensive Income 0 0 0
Ending balance 37 18 26
Deferred tax asset [Member] | Accrued Award Credits Liabilities [Member]      
Income tax [Line Items]      
Beginning balance 12 9 18
Recognized in Profit or Loss 5 3 (9)
Recognized in Other Comprehensive Income 0 0 0
Ending balance 17 12 9
Deferred tax asset [Member] | Deferred revenue [Member]      
Income tax [Line Items]      
Beginning balance 30 49 73
Recognized in Profit or Loss (15) (19) (24)
Recognized in Other Comprehensive Income 0 0 0
Ending balance 15 30 49
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 2 401 401
Recognized in Profit or Loss 6 (399) 0
Recognized in Other Comprehensive Income 0 0 0
Ending balance 8 2 401
Deferred tax asset [Member] | Unrealized foreign exchange loss gain, net [Member]      
Income tax [Line Items]      
Beginning balance 58 2 5
Recognized in Profit or Loss (55) 56 (3)
Recognized in Other Comprehensive Income 0 0 0
Ending balance 3 58 2
Deferred tax asset [Member] | Others [Member]      
Income tax [Line Items]      
Beginning balance 28 33 25
Recognized in Profit or Loss (3) (5) 8
Recognized in Other Comprehensive Income 0 0 0
Ending balance 25 28 33
Deferred tax asset [Member] | Temporary differences [Member]      
Income tax [Line Items]      
Beginning balance 2,027 2,774 3,113
Recognized in Profit or Loss 34 (516) (261)
Recognized in Other Comprehensive Income (31) (231) (78)
Ending balance 2,030 2,027 2,774
Deferred tax asset [Member] | Unused tax losses [Member]      
Income tax [Line Items]      
Beginning balance 170 11 20
Recognized in Profit or Loss (101) 159 (9)
Recognized in Other Comprehensive Income 0 0 0
Ending balance 69 170 11
Deferred Tax Liability      
Income tax [Line Items]      
Beginning balance (2,301) (2,189) (1,967)
Recognized in Profit or Loss (160) (112) (222)
Recognized in Other Comprehensive Income 0 0 0
Ending balance (2,461) (2,301) (2,189)
Deferred Tax Liability | Defined benefit pension plans [Member]      
Income tax [Line Items]      
Beginning balance (2,114) (1,969) (1,812)
Recognized in Profit or Loss (146) (145) (157)
Recognized in Other Comprehensive Income 0 0 0
Ending balance (2,260) (2,114) (1,969)
Deferred Tax Liability | Unrealized foreign exchange loss gain, net [Member]      
Income tax [Line Items]      
Beginning balance (1) (27) 0
Recognized in Profit or Loss (11) 26 (27)
Recognized in Other Comprehensive Income   0 0
Ending balance (12) (1) (27)
Deferred Tax Liability | Others [Member]      
Income tax [Line Items]      
Beginning balance (1) (19) (3)
Recognized in Profit or Loss (9) 18 (16)
Recognized in Other Comprehensive Income 0 0 0
Ending balance (10) (1) (19)
Deferred Tax Liability | Land value incremental tax [Member]      
Income tax [Line Items]      
Beginning balance (95) (95) (95)
Recognized in Profit or Loss 0 0 0
Recognized in Other Comprehensive Income 0 0 0
Ending balance (95) (95) (95)
Deferred Tax Liability | Deferred revenue for award credits [Member]      
Income tax [Line Items]      
Beginning balance (70) (55) (30)
Recognized in Profit or Loss 4 (15) (25)
Recognized in Other Comprehensive Income 0 0 0
Ending balance (66) (70) (55)
Deferred Tax Liability | Intangible assets [member]      
Income tax [Line Items]      
Beginning balance (20) (24) (27)
Recognized in Profit or Loss 2 4 3
Recognized in Other Comprehensive Income 0 0 0
Ending balance $ (18) $ (20) $ (24)