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Fair Value Information - Financial Instruments Measured at Fair Value on a Recurring Basis (Detail)
$ in Millions, $ in Millions
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Hedging financial liabilities $ 0 $ 0 $ 0
Fair value on a recurring basis [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 1,037   1,024
Hedging financial assets     13
Financial assets at FVOCI 4,412   3,491
Hedging financial liabilities 0    
Fair value on a recurring basis [Member] | Derivatives [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 1   3
Fair value on a recurring basis [Member] | Listed stocks [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   1
Financial assets at FVOCI 243   273
Fair value on a recurring basis [Member] | Non-listed stocks [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 793   861
Financial assets at FVOCI 4,169   3,218
Fair value on a recurring basis [Member] | Limited Partnership [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 219   135
Fair value on a recurring basis [Member] | Film and drama investing agreements [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 24   24
Fair value on a recurring basis [Member] | Level 1 [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   1
Hedging financial assets     0
Financial assets at FVOCI 243   273
Hedging financial liabilities 0    
Fair value on a recurring basis [Member] | Level 1 [Member] | Derivatives [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   0
Fair value on a recurring basis [Member] | Level 1 [Member] | Listed stocks [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   1
Financial assets at FVOCI 243   273
Fair value on a recurring basis [Member] | Level 1 [Member] | Non-listed stocks [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   0
Financial assets at FVOCI 0   0
Fair value on a recurring basis [Member] | Level 1 [Member] | Limited Partnership [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   0
Fair value on a recurring basis [Member] | Level 1 [Member] | Film and drama investing agreements [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   0
Fair value on a recurring basis [Member] | Level 2 [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 1   3
Hedging financial assets     13
Financial assets at FVOCI 0   0
Hedging financial liabilities 0    
Fair value on a recurring basis [Member] | Level 2 [Member] | Derivatives [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 1   3
Fair value on a recurring basis [Member] | Level 2 [Member] | Listed stocks [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   0
Financial assets at FVOCI 0   0
Fair value on a recurring basis [Member] | Level 2 [Member] | Non-listed stocks [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   0
Financial assets at FVOCI 0   0
Fair value on a recurring basis [Member] | Level 2 [Member] | Limited Partnership [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   0
Fair value on a recurring basis [Member] | Level 2 [Member] | Film and drama investing agreements [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   0
Fair value on a recurring basis [Member] | Level 3 [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 1,036   1,020
Hedging financial assets     0
Financial assets at FVOCI 4,169   3,218
Hedging financial liabilities 0    
Fair value on a recurring basis [Member] | Level 3 [Member] | Derivatives [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   0
Fair value on a recurring basis [Member] | Level 3 [Member] | Listed stocks [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 0   0
Financial assets at FVOCI 0   0
Fair value on a recurring basis [Member] | Level 3 [Member] | Non-listed stocks [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 793   861
Financial assets at FVOCI 4,169   3,218
Fair value on a recurring basis [Member] | Level 3 [Member] | Limited Partnership [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL 219   135
Fair value on a recurring basis [Member] | Level 3 [Member] | Film and drama investing agreements [Member]      
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]      
Financial assets at FVTPL $ 24   $ 24