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Cash Flow Information - Schedule of Detailed Information about Non Cash Transaction (Detail) $ in Millions, $ in Millions | 12 Months Ended
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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

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