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Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Financial Assets at Fair Value through Other Comprehensive Income (Detail)
$ in Millions, $ in Millions
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Disclosure of financial assets [line items]      
Current $ 192,202.7   $ 154,530.8
Noncurrent 7,822.9 $ 238.6 7,208.7
Investment in equity and debt instruments at FVTOCI 200,025.6   161,739.5
Debt securities [member]      
Disclosure of financial assets [line items]      
Investments in debt instruments at FVTOCI 187,359.9   149,802.9
Debt securities [member] | Corporate bonds [member]      
Disclosure of financial assets [line items]      
Investments in debt instruments at FVTOCI 108,612.1   79,605.5
Debt securities [member] | Agency mortgage-backed securities [member]      
Disclosure of financial assets [line items]      
Investments in debt instruments at FVTOCI 46,611.4   37,959.7
Debt securities [member] | Government bonds/Agency bonds [member]      
Disclosure of financial assets [line items]      
Investments in debt instruments at FVTOCI 20,645.9   22,338.9
Debt securities [member] | Asset-backed securities [member]      
Disclosure of financial assets [line items]      
Investments in debt instruments at FVTOCI 11,490.5   9,898.8
Equity instruments [member]      
Disclosure of financial assets [line items]      
Investment in equity instruments at FVTOCI 12,665.7   11,936.6
Equity instruments [member] | Non-publicly traded stocks [member]      
Disclosure of financial assets [line items]      
Investment in equity instruments at FVTOCI 7,822.9   7,208.7
Equity instruments [member] | Publicly traded stocks [member]      
Disclosure of financial assets [line items]      
Investment in equity instruments at FVTOCI $ 4,842.8   $ 4,727.9