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Financial Instruments - Fair Value of Financial Instruments Not Measured at Fair Value but for which Fair Value is Disclosed (Detail) - TWD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Financial assets $ 2,023,905.5 $ 1,864,862.6
Financial liabilities 1,768,812.2 1,669,387.6
Financial assets at amortised cost, class [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 145,960.6 129,727.4
Financial assets at amortised cost, class [member] | Corporate bonds [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 113,785.4 80,994.9
Financial assets at amortised cost, class [member] | Commercial paper [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 18,371.7 48,732.5
Financial assets at amortised cost, class [member] | Government Bonds Agency Bonds [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 13,803.5  
Financial liabilities at amortised cost [member] | Bonds payable including long-term liabilities-current portion) [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 920,897.5 852,436.4
Level 1 [member] | Financial assets at amortised cost, class [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 2,751.9  
Level 1 [member] | Financial assets at amortised cost, class [member] | Government Bonds Agency Bonds [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 2,751.9  
Not measured at fair value but for which the fair value is disclosed [member] | Financial assets at amortised cost, class [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 145,884.9 129,118.1
Not measured at fair value but for which the fair value is disclosed [member] | Financial assets at amortised cost, class [member] | Corporate bonds [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 113,694.4 80,236.1
Not measured at fair value but for which the fair value is disclosed [member] | Financial assets at amortised cost, class [member] | Commercial paper [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 18,385.3 48,882.0
Not measured at fair value but for which the fair value is disclosed [member] | Financial assets at amortised cost, class [member] | Government Bonds Agency Bonds [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 13,805.2  
Not measured at fair value but for which the fair value is disclosed [member] | Financial liabilities at amortised cost [member] | Bonds payable including long-term liabilities-current portion) [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value 849,236.9 765,301.5
Not measured at fair value but for which the fair value is disclosed [member] | Level 2 [member] | Financial assets at amortised cost, class [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 143,133.0 129,118.1
Not measured at fair value but for which the fair value is disclosed [member] | Level 2 [member] | Financial assets at amortised cost, class [member] | Corporate bonds [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 113,694.4 80,236.1
Not measured at fair value but for which the fair value is disclosed [member] | Level 2 [member] | Financial assets at amortised cost, class [member] | Commercial paper [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 18,385.3 48,882.0
Not measured at fair value but for which the fair value is disclosed [member] | Level 2 [member] | Financial assets at amortised cost, class [member] | Government Bonds Agency Bonds [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 11,053.3  
Not measured at fair value but for which the fair value is disclosed [member] | Level 2 [member] | Financial liabilities at amortised cost [member] | Bonds payable including long-term liabilities-current portion) [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value $ 849,236.9 $ 765,301.5