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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | $ 49,153.9 | $ 25,958.2 | $ 17,928.4
Recognized in Profit or loss | 19,198.5 | 23,292.3 | 7,660.7
Recognized in Other Comprehensive Income | 734.0 | (85.3) | 422.7
Effect of Exchange Rate Changes | 99.5 | (11.3) | (53.6)
Balance, End of Year | 69,185.9 | 49,153.9 | 25,958.2
Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (1,873.9) | (1,729.9) | (344.4)
Recognized in Profit or loss | 839.3 | (140.6) | (1,385.5)
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) | (1,729.9)
Depreciation [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 34,720.7 | 19,354.4 | 13,547.2
Recognized in Profit or loss | 10,552.2 | 15,365.7 | 5,824.0
Effect of Exchange Rate Changes | 26.4 | 0.6 | (16.8)
Balance, End of Year | 45,299.3 | 34,720.7 | 19,354.4
Refund liability [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 5,986.2 | 3,755.1 | 2,150.4
Recognized in Profit or loss | 6,100.8 | 2,231.5 | 1,606.1
Effect of Exchange Rate Changes | 2.5 | (0.4) | (1.4)
Balance, End of Year | 12,089.5 | 5,986.2 | 3,755.1
Unrealized Exchange Losses [Member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 0.0 |  |
Recognized in Profit or loss | 5,782.4 |  |
Balance, End of Year | 5,782.4 | 0.0 |
Unrealized loss on inventories [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 899.0 | 858.5 | 469.4
Recognized in Profit or loss | 1,402.2 | 41.0 | 391.1
Effect of Exchange Rate Changes | 4.1 | (0.5) | (2.0)
Balance, End of Year | 2,305.3 | 899.0 | 858.5
Net defined benefit liability [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 1,237.1 | 1,342.1 | 1,016.3
Recognized in Profit or loss | (249.1) | (75.9) | (96.3)
Recognized in Other Comprehensive Income | 734.0 | (29.1) | 422.1
Balance, End of Year | 1,722.0 | 1,237.1 | 1,342.1
Investment Tax Credits [Member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 5,621.7 |  |
Recognized in Profit or loss | (4,676.7) | 5,621.7 |
Balance, End of Year | 945.0 | 5,621.7 |
Deferred compensation cost [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 374.0 | 330.3 | 323.1
Recognized in Profit or loss | (48.2) | 49.2 | 27.4
Effect of Exchange Rate Changes | 35.4 | (5.5) | (20.2)
Balance, End of Year | 361.2 | 374.0 | 330.3
Others [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 315.2 | 317.8 | 422.0
Recognized in Profit or loss | 334.9 | 59.1 | (91.6)
Recognized in Other Comprehensive Income |  | (56.2) | 0.6
Effect of Exchange Rate Changes | 31.1 | (5.5) | (13.2)
Balance, End of Year | 681.2 | 315.2 | 317.8
Others [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (1,167.6) | (863.4) | (10.8)
Recognized in Profit or loss | 133.0 | (300.8) | (852.6)
Recognized in Other Comprehensive Income | 6.0 | (3.4) |
Effect of Exchange Rate Changes | (2.8) |  |
Balance, End of Year | (1,031.4) | (1,167.6) | (863.4)
Unrealized exchange gains [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (706.3) | (866.5) | (333.6)
Recognized in Profit or loss | 706.3 | 160.2 | (532.9)
Balance, End of Year | $ 0.0 | $ (706.3) | $ (866.5)

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