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Financial Instruments - Remaining Contractual Maturity for Non-derivative Financial Liabilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities $ 76,893 $ 73,719
Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 40,895 44,749
1-3 Months [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 15 7
3 Months to 1 Year [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 2,047 4,136
1-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 17,636 13,627
More Than 5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 16,300 11,200
Non-interest bearing [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 48,228 45,052
Non-interest bearing [Member] | Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 40,895 37,749
Non-interest bearing [Member] | 1-3 Months [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 0 0
Non-interest bearing [Member] | 3 Months to 1 Year [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 1,997 2,476
Non-interest bearing [Member] | 1-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 5,336 4,827
Non-interest bearing [Member] | More Than 5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 0 0
Floating interest rate instruments [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 1,665 1,667
Floating interest rate instruments [Member] | Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 0 0
Floating interest rate instruments [Member] | 1-3 Months [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 15 7
Floating interest rate instruments [Member] | 3 Months to 1 Year [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 50 1,660
Floating interest rate instruments [Member] | 1-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 1,600 0
Floating interest rate instruments [Member] | More Than 5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans $ 0 $ 0
Floating interest rate instruments [Member] | Weighted average [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Interest rates of bank loans 0.95% 0.78%
Fixed interest rate instruments [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans $ 27,000 $ 27,000
Fixed interest rate instruments [Member] | Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 0 7,000
Fixed interest rate instruments [Member] | 1-3 Months [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 0 0
Fixed interest rate instruments [Member] | 3 Months to 1 Year [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 0 0
Fixed interest rate instruments [Member] | 1-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 10,700 8,800
Fixed interest rate instruments [Member] | More Than 5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans $ 16,300 $ 11,200
Fixed interest rate instruments [Member] | Weighted average [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Interest rates of bank loans 0.51% 0.50%
Fair value interest rate risk [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Financial assets $ 27,671 $ 24,218
Financial liabilities 37,249 36,576
Cash flow interest rate risk [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Financial assets 14,171 9,306
Financial liabilities $ 1,665 $ 1,667