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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | $ 25,958.2 | $ 17,928.4 | $ 16,806.4
Recognized in Profit or loss | 23,292.3 | 7,660.7 | 1,176.2
Recognized in Other Comprehensive Income | (85.3) | 422.7 | (21.0)
Effect of Exchange Rate Changes | (11.3) | (53.6) | (33.2)
Balance, End of Year | 49,153.9 | 25,958.2 | 17,928.4
Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (1,729.9) | (344.4) | (233.3)
Recognized in Profit or loss | (140.6) | (1,385.5) | (111.1)
Recognized in Other Comprehensive Income | (3.4) |  |
Balance, End of Year | (1,873.9) | (1,729.9) | (344.4)
Depreciation [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 19,354.4 | 13,547.2 | 11,839.2
Recognized in Profit or loss | 15,365.7 | 5,824.0 | 1,727.8
Effect of Exchange Rate Changes | 0.6 | (16.8) | (19.8)
Balance, End of Year | 34,720.7 | 19,354.4 | 13,547.2
Refund liability [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 3,755.1 | 2,150.4 | 2,594.0
Recognized in Profit or loss | 2,231.5 | 1,606.1 | (443.2)
Effect of Exchange Rate Changes | (0.4) | (1.4) | (0.4)
Balance, End of Year | 5,986.2 | 3,755.1 | 2,150.4
Net defined benefit liability [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 1,342.1 | 1,016.3 | 1,084.9
Recognized in Profit or loss | (75.9) | (96.3) | (38.2)
Recognized in Other Comprehensive Income | (29.1) | 422.1 | (30.4)
Balance, End of Year | 1,237.1 | 1,342.1 | 1,016.3
Unrealized loss on inventories [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 858.5 | 469.4 | 751.0
Recognized in Profit or loss | 41.0 | 391.1 | (280.8)
Effect of Exchange Rate Changes | (0.5) | (2.0) | (0.8)
Balance, End of Year | 899.0 | 858.5 | 469.4
Deferred compensation cost [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 330.3 | 323.1 | 271.7
Recognized in Profit or loss | 49.2 | 27.4 | 59.4
Effect of Exchange Rate Changes | (5.5) | (20.2) | (8.0)
Balance, End of Year | 374.0 | 330.3 | 323.1
Investments in equity instruments at FVTOCI [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 66.3 | 65.7 | 56.2
Recognized in Profit or loss |  |  | 0.1
Recognized in Other Comprehensive Income | (56.2) | 0.6 | 9.4
Balance, End of Year | 10.1 | 66.3 | 65.7
Others [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 251.5 | 356.3 | 209.4
Recognized in Profit or loss | 59.1 | (91.6) | 151.1
Effect of Exchange Rate Changes | (5.5) | (13.2) | (4.2)
Balance, End of Year | 305.1 | 251.5 | 356.3
Others [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (863.4) | (10.8) | (171.6)
Recognized in Profit or loss | (300.8) | (852.6) | 160.8
Recognized in Other Comprehensive Income | (3.4) |  |
Balance, End of Year | (1,167.6) | (863.4) | (10.8)
Unrealized exchange gains [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (866.5) | (333.6) | (61.7)
Recognized in Profit or loss | 160.2 | (532.9) | (271.9)
Balance, End of Year | (706.3) | $ (866.5) | $ (333.6)
Investment Tax Credits [Member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Recognized in Profit or loss | 5,621.7 |  |
Balance, End of Year | $ 5,621.7 |  |

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