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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | $ 16,806.4 | $ 12,105.5 | $ 8,271.4
Recognized in Profit or loss | 1,176.2 | 4,514.6 | 3,931.8
Recognized in Other Comprehensive Income | (21.0) | 159.5 | 30.6
Effect of Disposal of Subsidiary |  |  | (14.5)
Effect of Exchange Rate Changes | (33.2) | 26.8 | (113.8)
Balance, End of Year | 17,928.4 | 16,806.4 | 12,105.5
Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (233.3) | (302.2) | (141.2)
Recognized in Profit or loss | (111.1) | 32.7 | (157.5)
Recognized in Other Comprehensive Income |  | 36.2 | (3.5)
Balance, End of Year | (344.4) | (233.3) | (302.2)
Depreciation [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 11,839.2 | 8,401.3 | 4,244.2
Recognized in Profit or loss | 1,727.8 | 3,430.4 | 4,207.2
Effect of Exchange Rate Changes | (19.8) | 7.5 | (50.1)
Balance, End of Year | 13,547.2 | 11,839.2 | 8,401.3
Refund liability [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 2,594.0 | 1,637.7 |
Recognized in Profit or loss | (443.2) | 955.0 |
Effect of Exchange Rate Changes | (0.4) | 1.3 |
Balance, End of Year | 2,150.4 | 2,594.0 | 1,637.7
Net defined benefit liability [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 1,084.9 | 975.3 | 939.5
Recognized in Profit or loss | (38.2) | 6.3 | 5.2
Recognized in Other Comprehensive Income | (30.4) | 103.3 | 30.6
Balance, End of Year | 1,016.3 | 1,084.9 | 975.3
Unrealized loss on inventories [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 751.0 | 629.5 | 737.3
Recognized in Profit or loss | (280.8) | 120.5 | (105.1)
Effect of Exchange Rate Changes | (0.8) | 1.0 | (2.7)
Balance, End of Year | 469.4 | 751.0 | 629.5
Deferred compensation cost [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 271.7 | 266.5 | 378.7
Recognized in Profit or loss | 59.4 | (4.7) | (83.1)
Effect of Exchange Rate Changes | (8.0) | 9.9 | (29.1)
Balance, End of Year | 323.1 | 271.7 | 266.5
Unrealized exchange gains [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (61.7) | (169.5) | (48.7)
Recognized in Profit or loss | (271.9) | 107.8 | (120.8)
Balance, End of Year | (333.6) | (61.7) | (169.5)
Investments in equity instruments at FVTOCI [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 56.2 |  |
Recognized in Profit or loss | 0.1 |  |
Recognized in Other Comprehensive Income | 9.4 | 56.2 |
Balance, End of Year | 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 |
Balance, End of Year |  |  | (95.4)
Others [member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | 209.4 | 195.2 | 445.1
Recognized in Profit or loss | 151.1 | 7.1 | (222.4)
Effect of Exchange Rate Changes | (4.2) | 7.1 | (27.5)
Balance, End of Year | 356.3 | 209.4 | 195.2
Others [member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year | (171.6) | (37.3) |
Recognized in Profit or loss | 160.8 | (75.1) | (36.7)
Recognized in Other Comprehensive Income |  | (59.2) | (0.6)
Balance, End of Year | $ (10.8) | (171.6) | (37.3)
Provision For Sales Returns And Allowance [Member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year |  | 1,637.7 | 1,512.1
Recognized in Profit or loss |  |  | 130.0
Effect of Exchange Rate Changes |  |  | (4.4)
Balance, End of Year |  |  | 1,637.7
Operating Loss Carryforward [Member] | Deferred Income Tax Assets [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year |  |  | 14.5
Effect of Disposal of Subsidiary |  |  | (14.5)
Available For Sale Financial Assets [Member] | Deferred Income Tax Liabilities [Member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Balance, Beginning of Year |  | $ (95.4) | (92.5)
Recognized in Other Comprehensive Income |  |  | (2.9)
Balance, End of Year |  |  | $ (95.4)

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