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Cash Flow Information - Schedule of Detailed Information about Non Cash Transaction (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of detailed information about non-cash transaction [line items]        
Conversion of convertible bonds into equity securities $ (120.5)     $ (23.8)
Payments for acquisition of financial assets at FVTOCI 262,637.5 $ 9,353.2 $ 257,558.2 96,412.8
Additions of financial assets at FVTOCI 268,653.5   257,824.5 100,759.6
Disposal of financial assets at FVTOCI 269,011.8   229,525.1 90,545.1
Additions of property, plant and equipment 525,720.7   564,283.0 300,024.4
Exchange of assets (1.1)   (3,287.1)  
Changes in other financial assets 10.5   22.2 22.8
Proceeds from disposal of financial assets at FVTOCI 266,931.9   230,444.5 86,639.3
Changes in payables to contractors and equipment suppliers (19,085.9)   (100,963.9) 13,979.9
Transferred to initial carrying amount of hedged items 20.3   (82.3) 22.2
Payments for acquisition of property, plant and equipment 507,238.7 18,064.1 460,422.2 315,581.9
Changes in account payable 404.6 14.4 5,860.1 4,540.6
Changes in accrued expenses and other current liabilities (5,895.5)   (266.3) (4,323.0)
Payments for acquisition of intangible assets 9,542.4 $ 339.8 9,329.9 7,100.3
Intangible assets [member]        
Disclosure of detailed information about non-cash transaction [line items]        
Additions of intangible assets 12,559.5   9,237.7 7,105.0
Changes in account payable 191.4   70.0 (27.5)
Changes in accrued expenses and other current liabilities (3,219.0)      
Financial assets measured at fair value through other comprehensive income, category [member]        
Disclosure of detailed information about non-cash transaction [line items]        
Changes in other financial assets (2,079.9)   919.4 (3,905.8)
Payments for acquisition of intangible assets 9,542.4   9,329.9 7,100.3
Property, plant and equipment [member]        
Disclosure of detailed information about non-cash transaction [line items]        
Changes in other financial assets $ 584.7   $ 472.5 $ 1,555.4