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Financial Instruments - Remaining Contractual Maturity for Non-derivative Financial Liabilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities $ 82,971 $ 78,032
Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 42,403 37,930
1-3 Months [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 51 15
3 Months to 1 Year [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 11,548 4,278
1-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 24,250 31,109
More Than 5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Non-derivative financial liabilities 4,719 4,700
Non-interest bearing [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 50,031 45,347
Non-interest bearing [Member] | Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 42,220 37,930
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 2,500 2,108
Non-interest bearing [Member] | 1-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 5,311 5,309
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 1,880 2,185
Floating interest rate instruments [Member] | Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 104 0
Floating interest rate instruments [Member] | 1-3 Months [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 6 15
Floating interest rate instruments [Member] | 3 Months to 1 Year [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 79 2,170
Floating interest rate instruments [Member] | 1-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 1,691 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 2.08% 1.99%
Fixed interest rate instruments [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans $ 31,060 $ 30,500
Fixed interest rate instruments [Member] | Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 79 0
Fixed interest rate instruments [Member] | 1-3 Months [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 45 0
Fixed interest rate instruments [Member] | 3 Months to 1 Year [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 8,969 0
Fixed interest rate instruments [Member] | 1-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans 17,248 25,800
Fixed interest rate instruments [Member] | More Than 5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Loans $ 4,719 $ 4,700
Fixed interest rate instruments [Member] | Weighted average [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Interest rates of bank loans 0.54% 0.53%
Fair value interest rate risk [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Financial assets $ 47,563 $ 43,156
Financial liabilities 41,445 41,458
Cash flow interest rate risk [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Financial assets 12,950 9,136
Financial liabilities $ 1,785 $ 2,185