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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | $ 69,185.9 | $ 49,153.9 | $ 25,958.2
Recognized in Profit or loss | (5,112.8) | 19,198.5 | 23,292.3
Recognized in Other Comprehensive Income | 124.6 | 734.0 | (85.3)
Effect of Exchange Rate Changes | (21.9) | 99.5 | (11.3)
Balance, End of Year | 64,175.8 | 69,185.9 | 49,153.9
Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (1,031.4) | (1,873.9) | (1,729.9)
Recognized in Profit or loss |  | 839.3 | (140.6)
Recognized in Other Comprehensive Income |  | 6.0 | (3.4)
Effect of Exchange Rate Changes |  | (2.8) |
Balance, End of Year |  | (1,031.4) | (1,873.9)
Depreciation [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 45,299.3 | 34,720.7 | 19,354.4
Recognized in Profit or loss | (4,197.2) | 10,552.2 | 15,365.7
Effect of Exchange Rate Changes | (7.4) | 26.4 | 0.6
Balance, End of Year | 41,094.7 | 45,299.3 | 34,720.7
Refund liability [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 12,089.5 | 5,986.2 | 3,755.1
Recognized in Profit or loss | (2,673.5) | 6,100.8 | 2,231.5
Effect of Exchange Rate Changes | (1.0) | 2.5 | (0.4)
Balance, End of Year | 9,415.0 | 12,089.5 | 5,986.2
Unrealized Exchange Losses [Member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 5,782.4 |  |
Recognized in Profit or loss | 1,317.6 | 5,782.4 |
Balance, End of Year | 7,100.0 | 5,782.4 |
Investment Tax Credits [Member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 945.0 | 5,621.7 |
Recognized in Profit or loss | (925.9) | (4,676.7) | 5,621.7
Balance, End of Year | 19.1 | 945.0 | 5,621.7
Net defined benefit liability [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 1,722.0 | 1,237.1 | 1,342.1
Recognized in Profit or loss | (116.9) | (249.1) | (75.9)
Recognized in Other Comprehensive Income | 124.6 | 734.0 | (29.1)
Balance, End of Year | 1,729.7 | 1,722.0 | 1,237.1
Unrealized loss on inventories [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 2,305.3 | 899.0 | 858.5
Recognized in Profit or loss | 466.2 | 1,402.2 | 41.0
Effect of Exchange Rate Changes | (0.3) | 4.1 | (0.5)
Balance, End of Year | 2,771.2 | 2,305.3 | 899.0
Deferred compensation cost [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 361.2 | 374.0 | 330.3
Recognized in Profit or loss | 129.9 | (48.2) | 49.2
Effect of Exchange Rate Changes | (1.5) | 35.4 | (5.5)
Balance, End of Year | 489.6 | 361.2 | 374.0
Others [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 681.2 | 315.2 | 317.8
Recognized in Profit or loss | 887.0 | 334.9 | 59.1
Recognized in Other Comprehensive Income |  | 0.0 | (56.2)
Effect of Exchange Rate Changes | (11.7) | 31.1 | (5.5)
Balance, End of Year | 1,556.5 | 681.2 | 315.2
Others [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (1,031.4) | (1,167.6) | (863.4)
Recognized in Profit or loss | 976.8 | 133.0 | (300.8)
Recognized in Other Comprehensive Income | 0.0 | 6.0 | (3.4)
Effect of Exchange Rate Changes | 0.8 | (2.8) |
Balance, End of Year | (53.8) | (1,031.4) | (1,167.6)
Unrealized exchange gains [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | $ 0.0 | (706.3) | (866.5)
Recognized in Profit or loss |  | 706.3 | 160.2
Balance, End of Year |  | $ 0.0 | $ (706.3)

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