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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | $ 17,928.4 | $ 16,806.4 | $ 12,105.5
Recognized in Profit or loss | 7,660.7 | 1,176.2 | 4,514.6
Recognized in Other Comprehensive Income | 422.7 | (21.0) | 159.5
Effect of Exchange Rate Changes | (53.6) | (33.2) | 26.8
Balance, End of Year | 25,958.2 | 17,928.4 | 16,806.4
Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (344.4) | (233.3) | (302.2)
Recognized in Profit or loss | (1,385.5) | (111.1) | 32.7
Recognized in Other Comprehensive Income |  |  | 36.2
Balance, End of Year | (1,729.9) | (344.4) | (233.3)
Depreciation [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 13,547.2 | 11,839.2 | 8,401.3
Recognized in Profit or loss | 5,824.0 | 1,727.8 | 3,430.4
Effect of Exchange Rate Changes | (16.8) | (19.8) | 7.5
Balance, End of Year | 19,354.4 | 13,547.2 | 11,839.2
Refund liability [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 2,150.4 | 2,594.0 | 1,637.7
Recognized in Profit or loss | 1,606.1 | (443.2) | 955.0
Effect of Exchange Rate Changes | (1.4) | (0.4) | 1.3
Balance, End of Year | 3,755.1 | 2,150.4 | 2,594.0
Net defined benefit liability [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 1,016.3 | 1,084.9 | 975.3
Recognized in Profit or loss | (96.3) | (38.2) | 6.3
Recognized in Other Comprehensive Income | 422.1 | (30.4) | 103.3
Balance, End of Year | 1,342.1 | 1,016.3 | 1,084.9
Unrealized loss on inventories [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 469.4 | 751.0 | 629.5
Recognized in Profit or loss | 391.1 | (280.8) | 120.5
Effect of Exchange Rate Changes | (2.0) | (0.8) | 1.0
Balance, End of Year | 858.5 | 469.4 | 751.0
Deferred compensation cost [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 323.1 | 271.7 | 266.5
Recognized in Profit or loss | 27.4 | 59.4 | (4.7)
Effect of Exchange Rate Changes | (20.2) | (8.0) | 9.9
Balance, End of Year | 330.3 | 323.1 | 271.7
Investments in equity instruments at FVTOCI [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 65.7 | 56.2 |
Recognized in Profit or loss |  | 0.1 |
Recognized in Other Comprehensive Income | 0.6 | 9.4 | 56.2
Balance, End of Year | 66.3 | 65.7 | 56.2
Investments in equity instruments at FVTOCI [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year |  |  | (95.4)
Recognized in Other Comprehensive Income |  |  | 95.4
Others [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 356.3 | 209.4 | 195.2
Recognized in Profit or loss | (91.6) | 151.1 | 7.1
Effect of Exchange Rate Changes | (13.2) | (4.2) | 7.1
Balance, End of Year | 251.5 | 356.3 | 209.4
Others [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (10.8) | (171.6) | (37.3)
Recognized in Profit or loss | (852.6) | 160.8 | (75.1)
Recognized in Other Comprehensive Income |  |  | (59.2)
Balance, End of Year | (863.4) | (10.8) | (171.6)
Unrealized exchange gains [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (333.6) | (61.7) | (169.5)
Recognized in Profit or loss | (532.9) | (271.9) | 107.8
Balance, End of Year | $ (866.5) | $ (333.6) | $ (61.7)

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