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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, 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