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Subsidiaries - Detailed Information of Equity Transactions (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
CHIEF Share-Based Payment [Member]      
Disclosure Of Classes Of Share Capital [Line Items]      
Cash consideration received from noncontrolling interests $ 29 $ 75 $ 19
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests (17) (49) (20)
Differences arising from equity transactions 12 26 (1)
Additional paid-in capital - arising from changes in equities of subsidiaries 12 26 $ (1)
SENAO not Proportionately participating in the Capital Increase of Youth [Member]      
Disclosure Of Classes Of Share Capital [Line Items]      
Cash consideration received from noncontrolling interests   0  
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests   0  
Differences arising from equity transactions   0  
Additional paid-in capital - arising from changes in equities of subsidiaries   0  
IISI Share-Based Payment [Member]      
Disclosure Of Classes Of Share Capital [Line Items]      
Cash consideration received from noncontrolling interests 4 7  
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests (1) (7)  
Differences arising from equity transactions 3 0  
Additional paid-in capital - arising from changes in equities of subsidiaries 3 $ 0  
CHTSC Share-Based Payment [Member]      
Disclosure Of Classes Of Share Capital [Line Items]      
Cash consideration received from noncontrolling interests 21    
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests (19)    
Differences arising from equity transactions 2    
Additional paid-in capital - arising from changes in equities of subsidiaries $ 2