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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)

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