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Financial Instruments - Fair Value of Financial Instruments Measured at Fair Value on a Recurring Basis (Detail) - TWD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]        
Financial assets at FVTPL, mandatorily measured at FVTPL $ 14,342.1 $ 1,070.4    
Financial assets at FVTPL 14,342.1 1,070.4    
Financial assets at FVTOCI, investments in equity and debt instruments 161,739.5 129,157.7    
Financial assets at FVTOCI 167,150.8 136,483.3    
Level 3 [member]        
Disclosure of detailed information about financial instruments [line items]        
Financial assets at FVTOCI, investments in equity and debt instruments 20,849.6 6,282.1 $ 5,887.9 $ 4,514.9
Measured at fair value on a recurring basis [member]        
Disclosure of detailed information about financial instruments [line items]        
Financial assets at FVTPL 14,342.1 1,070.4    
Financial assets at FVTOCI 167,150.8 136,483.3    
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 5,411.3 7,325.6    
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 26,819.0 19,123.4    
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 701.2 947.5    
Financial assets at FVTOCI 133,123.1 111,200.7    
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 5,411.3 7,325.6    
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 13,640.9 122.9    
Financial assets at FVTOCI 7,208.7 6,159.2    
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 701.2 947.5    
Financial liabilities at FVTPL, Held for trading 121.4 116.2    
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 701.2 947.5    
Financial liabilities at FVTPL, Held for trading 121.4 116.2    
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 223.4 122.9    
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 223.4 122.9    
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 79,605.5 66,116.2    
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 79,605.5 66,116.2    
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 37,959.7 28,367.9    
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 37,959.7 28,367.9    
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 9,898.8 9,274.7    
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 9,898.8 9,274.7    
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 22,338.9 18,961.8    
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 22,091.1 18,845.5    
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 247.8 116.3    
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 4,727.9 277.9    
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 4,727.9 277.9    
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   2.3    
Hedging derivative financial liabilities 43.8 0.8    
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   2.3    
Hedging derivative financial liabilities 43.8 0.8    
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 7,208.7 6,159.2    
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 7,208.7 $ 6,159.2    
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 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 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 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 $ 13,307.2