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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, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Financial assets $ 2,942,675.9 $ 2,023,905.5
Financial liabilities 1,963,763.8 1,768,812.2
Financial assets at amortised cost, class [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 190,567.8 145,960.6
Financial assets at amortised cost, class [member] | Corporate bonds [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 171,980.2 113,785.4
Financial assets at amortised cost, class [member] | Commercial paper [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 14,208.1 18,371.7
Financial assets at amortised cost, class [member] | Government Bonds Agency Bonds [Member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 4,379.5 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 983,752.5 920,897.5
Level 1 [member] | Financial assets at amortised cost, class [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 4,353.4 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 4,353.4 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 191,094.6 145,884.9
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 172,518.5 113,694.4
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 14,222.7 18,385.3
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 4,353.4 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 900,344.7 849,236.9
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 186,741.2 143,133.0
Not measured at fair value but for which the fair value is disclosed [member] | Level 2 [member] | Financial assets at amortised cost, class [member] | Corporate bonds [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 172,518.5 113,694.4
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 14,222.7 18,385.3
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 0.0 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 $ 900,344.7 $ 849,236.9