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Cash Flow Information - Schedule of Detailed Information about Non Cash Transaction (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure of detailed information about non-cash transaction [line items]        
Payments for acquisition of financial assets at FVTOCI $ 87,787.5 $ 2,677.3 $ 62,752.0 $ 54,566.7
Payments for acquisition of property, plant and equipment 956,006.5 $ 29,155.4 949,816.8 1,082,672.1
Acquisition of financial assets at FVTOCI [Member]        
Disclosure of detailed information about non-cash transaction [line items]        
Additions of financial assets at FVTOCI 88,415.9   62,779.0 45,126.2
Discontinuation of significant influence from investment accounted for using the equity method 0.0   (10.7) 0.0
Conversion of convertible bonds into equity securities (387.6)   (145.1) 0.0
Payments for acquisition of financial assets at FVTOCI 87,787.5   62,752.0 54,566.7
Changes in accrued expenses and other current liabilities (240.8)   128.8 9,440.5
Disposal of financial assets at FVTOCI [Member]        
Disclosure of detailed information about non-cash transaction [line items]        
Changes in other financial assets 124.4   351.7 1,832.5
Disposal of financial assets at FVTOCI 67,560.1   35,346.9 43,130.9
Proceeds from disposal of financial assets at FVTOCI 67,684.5   35,698.6 44,963.4
Classes of property, plant and equipment [domain]        
Disclosure of detailed information about non-cash transaction [line items]        
Additions of property, plant and equipment 798,507.4   897,557.1 1,139,892.1
Changes in other receivables 140,289.7   44.5 5,730.1
Exchange of assets (109.3)   (78.0) (275.6)
Changes in accrued expenses and other current liabilities 44,612.1   17,832.8 630.6
Changes in payables to contractors and equipment suppliers (17,988.1)   40,750.2 (60,638.2)
Transferred to initial carrying amount of hedged items 5.0   39.9 0.0
Capitalized interests (9,310.3)   (6,329.7) (2,666.9)
Payments for acquisition of property, plant and equipment $ 956,006.5   $ 949,816.8 $ 1,082,672.1