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Income Tax - Analysis of Deferred Income Tax Assets and Liabilities in Consolidated Statements of Financial Position (Detail) - TWD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Deferred income tax assets (liabilities) |  |  |
Recognized in Profit or loss | $ (2,654.9) |  |
Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 64,175.8 | $ 69,185.9 | $ 49,153.9
Recognized in Profit or loss | 1,747.4 | (5,112.8) | 19,198.5
Recognized in Other Comprehensive Income | (38.9) | 124.6 | 734.0
Effect of Exchange Rate Changes | 59.0 | (21.9) | 99.5
Balance, End of Year | 65,943.3 | 64,175.8 | 69,185.9
Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (53.8) | (1,031.4) | (1,873.9)
Recognized in Profit or loss | (3,933.8) |  | 839.3
Recognized in Other Comprehensive Income |  |  | 6.0
Effect of Exchange Rate Changes | (0.9) |  | (2.8)
Balance, End of Year | (3,988.5) | (53.8) | (1,031.4)
Depreciation [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 41,094.7 | 45,299.3 | 34,720.7
Recognized in Profit or loss | (7,787.6) | (4,197.2) | 10,552.2
Effect of Exchange Rate Changes | 12.7 | (7.4) | 26.4
Balance, End of Year | 33,319.8 | 41,094.7 | 45,299.3
Refund liability [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 9,415.0 | 12,089.5 | 5,986.2
Recognized in Profit or loss | 3,856.8 | (2,673.5) | 6,100.8
Effect of Exchange Rate Changes | 2.6 | (1.0) | 2.5
Balance, End of Year | 13,274.4 | 9,415.0 | 12,089.5
Unrealized Exchange Losses [Member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 7,100.0 | 5,782.4 |
Recognized in Profit or loss | 1,978.2 | 1,317.6 | 5,782.4
Balance, End of Year | 9,078.2 | 7,100.0 | 5,782.4
Unrealized loss on inventories [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 2,771.2 | 2,305.3 | 899.0
Recognized in Profit or loss | (25.9) | 466.2 | 1,402.2
Effect of Exchange Rate Changes | 4.0 | (0.3) | 4.1
Balance, End of Year | 2,749.3 | 2,771.2 | 2,305.3
Net defined benefit liability [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 1,729.7 | 1,722.0 | 1,237.1
Recognized in Profit or loss | (284.8) | (116.9) | (249.1)
Recognized in Other Comprehensive Income | (28.9) | 124.6 | 734.0
Balance, End of Year | 1,416.0 | 1,729.7 | 1,722.0
Deferred compensation cost [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 489.6 | 361.2 | 374.0
Recognized in Profit or loss | 66.0 | 129.9 | (48.2)
Effect of Exchange Rate Changes | 33.2 | (1.5) | 35.4
Balance, End of Year | 588.8 | 489.6 | 361.2
Others [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 1,575.6 | 1,626.2 | 5,936.9
Recognized in Profit or loss | 1,289.8 | (38.9) | (4,341.8)
Recognized in Other Comprehensive Income | (10.0) | 0.0 | 0.0
Effect of Exchange Rate Changes | 47.0 | (11.7) | 31.1
Balance, End of Year | 2,902.4 | 1,575.6 | 1,626.2
Others [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (53.8) | (1,031.4) | (1,167.6)
Recognized in Profit or loss | (8.5) | 976.8 | 133.0
Recognized in Other Comprehensive Income |  | 0.0 | 6.0
Effect of Exchange Rate Changes | (0.9) | 0.8 | (2.8)
Balance, End of Year | (63.2) | (53.8) | (1,031.4)
Unrealized exchange gains [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year |  | $ 0.0 | (706.3)
Recognized in Profit or loss |  |  | 706.3
Balance, End of Year |  |  | $ 0.0
Operating Loss Carryforward [Member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Recognized in Profit or loss | 2,654.9 |  |
Effect of Exchange Rate Changes | (40.5) |  |
Balance, End of Year | 2,614.4 |  |
Subsidiarys projected earnings distribution [Member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Recognized in Profit or loss | (3,925.3) |  |
Balance, End of Year | $ (3,925.3) |  |

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