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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
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)