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Financial Instruments - Liquidity Analysis for Derivative Financial Instruments (Detail) - TWD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross inflows (outflows) on derivatives $ (14) $ 4
Forward exchange contracts inflows [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross inflows on derivatives 471 635
Forward exchange contracts outflows [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross outflows on derivatives 485 631
Less Than 30 Days [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross inflows (outflows) on derivatives 0 0
Less Than 30 Days [Member] | Forward exchange contracts inflows [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross inflows on derivatives 0 0
Less Than 30 Days [Member] | Forward exchange contracts outflows [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross outflows on derivatives 0 0
1-3 Months [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross inflows (outflows) on derivatives (14) 4
1-3 Months [Member] | Forward exchange contracts inflows [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross inflows on derivatives 471 635
1-3 Months [Member] | Forward exchange contracts outflows [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross outflows on derivatives 485 631
3 Months to 1 Year [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross inflows (outflows) on derivatives 0 0
3 Months to 1 Year [Member] | Forward exchange contracts inflows [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross inflows on derivatives 0 0
3 Months to 1 Year [Member] | Forward exchange contracts outflows [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross outflows on derivatives 0 0
1-5 Years [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross inflows (outflows) on derivatives 0 0
1-5 Years [Member] | Forward exchange contracts inflows [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross inflows on derivatives 0 0
1-5 Years [Member] | Forward exchange contracts outflows [Member]    
Disclosure of maturity analysis for derivative financial liabilities [Line Items]    
Undiscounted gross outflows on derivatives $ 0 $ 0