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Financial Instruments - Remaining Contractual Maturity for Non-derivative Financial Liabilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities $ 78,032 $ 80,027
Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 37,930 39,904
1-3 Months [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 15 300
3 Months to 1 Year [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 4,278 2,566
1-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 31,109 28,457
More Than 5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 4,700 8,800
Non-interest bearing [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 45,347 47,205
Non-interest bearing [Member] | Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 37,930 39,904
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 2,108 2,144
Non-interest bearing [Member] | 1-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 5,309 5,157
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 2,185 2,322
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 15 300
Floating interest rate instruments [Member] | 3 Months to 1 Year [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 2,170 422
Floating interest rate instruments [Member] | 1-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 0 1,600
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 1.99% 1.79%
Fixed interest rate instruments [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans $ 30,500 $ 30,500
Fixed interest rate instruments [Member] | Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 0 0
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 25,800 21,700
Fixed interest rate instruments [Member] | More Than 5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans $ 4,700 $ 8,800
Fixed interest rate instruments [Member] | Weighted average [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Interest rates of bank loans 0.53% 0.53%
Fair value interest rate risk [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Financial assets $ 43,156 $ 41,593
Financial liabilities 41,458 41,150
Cash flow interest rate risk [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Financial assets 9,136 9,631
Financial liabilities $ 2,185 $ 2,322