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Financial Instruments - Fair Value of Financial Instruments Measured at Fair Value on a Recurring Basis (Detail)
$ in Millions, $ in Millions
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL, mandatorily measured at FVTPL $ 15,407.5   $ 14,342.1    
Financial assets at FVTPL 15,407.5   14,342.1    
Financial assets at FVTOCI, investments in equity and debt instruments 200,025.6   161,739.5    
Notes and accounts receivable, net 270,683.2 $ 8,255.1 201,313.9    
Financial assets at FVTOCI 205,938.1   167,150.8    
Level 3 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, investments in equity and debt instruments 23,022.7   20,849.6 $ 6,282.1 $ 5,887.9
Measured at fair value on a recurring basis [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL 15,407.5   14,342.1    
Financial assets at FVTOCI 205,938.1   167,150.8    
Measured at fair value on a recurring basis [member] | Notes and accounts receivable, net [member]          
Disclosure of detailed information about financial instruments [line items]          
Notes and accounts receivable, net 5,912.5   5,411.3    
Measured at fair value on a recurring basis [member] | Level 1 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI 25,488.7   26,819.0    
Measured at fair value on a recurring basis [member] | Level 2 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL 207.7   701.2    
Financial assets at FVTOCI 172,626.5   133,123.1    
Measured at fair value on a recurring basis [member] | Level 2 [member] | Notes and accounts receivable, net [member]          
Disclosure of detailed information about financial instruments [line items]          
Notes and accounts receivable, net 5,912.5   5,411.3    
Measured at fair value on a recurring basis [member] | Level 3 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL 15,199.8   13,640.9    
Financial assets at FVTOCI 7,822.9   7,208.7    
Measured at fair value on a recurring basis [member] | Forward exchange contracts [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL, mandatorily measured at FVTPL 207.7   701.2    
Financial liabilities at FVTPL, Held for trading 466.5   121.4    
Measured at fair value on a recurring basis [member] | Forward exchange contracts [member] | Level 2 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL, mandatorily measured at FVTPL 207.7   701.2    
Financial liabilities at FVTPL, Held for trading 466.5   121.4    
Measured at fair value on a recurring basis [member] | Convertible Bonds [Member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL, mandatorily measured at FVTPL     223.4    
Measured at fair value on a recurring basis [member] | Convertible Bonds [Member] | Level 3 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL, mandatorily measured at FVTPL     223.4    
Measured at fair value on a recurring basis [member] | Corporate bonds [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, investments in equity and debt instruments 108,612.1   79,605.5    
Measured at fair value on a recurring basis [member] | Corporate bonds [member] | Level 2 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, investments in equity and debt instruments 108,612.1   79,605.5    
Measured at fair value on a recurring basis [member] | Agency mortgage-backed securities [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, investments in equity and debt instruments 46,611.4   37,959.7    
Measured at fair value on a recurring basis [member] | Agency mortgage-backed securities [member] | Level 2 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, investments in equity and debt instruments 46,611.4   37,959.7    
Measured at fair value on a recurring basis [member] | Asset-backed securities [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, investments in equity and debt instruments 11,490.5   9,898.8    
Measured at fair value on a recurring basis [member] | Asset-backed securities [member] | Level 2 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, investments in equity and debt instruments 11,490.5   9,898.8    
Measured at fair value on a recurring basis [member] | Government bonds/Agency bonds [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, investments in equity and debt instruments 20,645.9   22,338.9    
Measured at fair value on a recurring basis [member] | Government bonds/Agency bonds [member] | Level 1 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, investments in equity and debt instruments 20,645.9   22,091.1    
Measured at fair value on a recurring basis [member] | Government bonds/Agency bonds [member] | Level 2 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, investments in equity and debt instruments     247.8    
Measured at fair value on a recurring basis [member] | Publicly traded stocks [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, Investments in equity instruments 4,842.8   4,727.9    
Measured at fair value on a recurring basis [member] | Publicly traded stocks [member] | Level 1 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, Investments in equity instruments 4,842.8   4,727.9    
Measured at fair value on a recurring basis [member] | Interest rate futures contracts [member] | Fair value hedges [member]          
Disclosure of detailed information about financial instruments [line items]          
Hedging derivative financial assets 11.0        
Hedging derivative financial liabilities     43.8    
Measured at fair value on a recurring basis [member] | Interest rate futures contracts [member] | Level 1 [member] | Fair value hedges [member]          
Disclosure of detailed information about financial instruments [line items]          
Hedging derivative financial assets 11.0        
Hedging derivative financial liabilities     43.8    
Measured at fair value on a recurring basis [member] | Non-publicly traded equity investments [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, Investments in equity instruments 7,822.9   7,208.7    
Measured at fair value on a recurring basis [member] | Non-publicly traded equity investments [member] | Level 3 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTOCI, Investments in equity instruments 7,822.9   7,208.7    
Measured at fair value on a recurring basis [member] | Simple agreement for future equity [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL, mandatorily measured at FVTPL 131.1        
Measured at fair value on a recurring basis [member] | Simple agreement for future equity [member] | Level 3 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL, mandatorily measured at FVTPL 131.1        
Measured at fair value on a recurring basis [member] | Mutual Funds [Member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL, mandatorily measured at FVTPL 886.9   110.3    
Measured at fair value on a recurring basis [member] | Mutual Funds [Member] | Level 3 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL, mandatorily measured at FVTPL 886.9   110.3    
Measured at fair value on a recurring basis [member] | Convertible preferred stocks [Member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL, mandatorily measured at FVTPL 14,181.8   13,307.2    
Measured at fair value on a recurring basis [member] | Convertible preferred stocks [Member] | Level 3 [member]          
Disclosure of detailed information about financial instruments [line items]          
Financial assets at FVTPL, mandatorily measured at FVTPL $ 14,181.8   $ 13,307.2