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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, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Disclosure of detailed information about non-cash transaction [line items] |  |  |  |
Payments for acquisition of financial assets at FVTOCI | $ 62,752.0 | $ 2,049.4 | $ 54,566.7 | $ 255,888.7
Payments for acquisition of property, plant and equipment | 949,816.8 | $ 31,019.5 | 1,082,672.1 | 839,195.7
Acquisition of financial assets at FVTOCI [Member] |  |  |  |
Disclosure of detailed information about non-cash transaction [line items] |  |  |  |
Additions of financial assets at FVTOCI | 62,779.0 |  | 45,126.2 | 253,613.9
Discontinuation of significant influence from investment accounted for using the equity method | (10.7) |  |  |
Conversion of convertible bonds into equity securities | (145.1) |  | 0.0 | 0.0
Exchange of equity instruments | 0.0 |  | 0.0 | (106.2)
Payments for acquisition of financial assets at FVTOCI | 62,752.0 |  | 54,566.7 | 255,888.7
Changes in accrued expenses and other current liabilities | 128.8 |  | 9,440.5 | 2,381.0
Disposal of financial assets at FVTOCI [Member] |  |  |  |
Disclosure of detailed information about non-cash transaction [line items] |  |  |  |
Changes in other financial assets | 351.7 |  | 1,832.5 | 3,509.3
Exchange of equity instruments | 0.0 |  | 0.0 | (106.2)
Disposal of financial assets at FVTOCI | 35,346.9 |  | 43,130.9 | 251,201.4
Proceeds from disposal of financial assets at FVTOCI | 35,698.6 |  | 44,963.4 | 254,604.5
Property, plant and equipment [member] |  |  |  |
Disclosure of detailed information about non-cash transaction [line items] |  |  |  |
Additions of property, plant and equipment | 897,557.1 |  | 1,139,892.1 | 835,406.3
Changes in other financial assets | 44.5 |  | 5,730.1 | 1,934.0
Exchange of assets | (78.0) |  | (275.6) | (3,256.5)
Changes in payables to contractors and equipment suppliers | 40,750.2 |  | (60,638.2) | 5,153.3
Changes in accrued expenses and other current liabilities | 17,832.8 |  | 630.6 | 0.0
Capitalized interests | (6,329.7) |  | (2,666.9) | 0.0
Transferred to initial carrying amount of hedged items | 39.9 |  | 0.0 | (41.4)
Payments for acquisition of property, plant and equipment | $ 949,816.8 |  | $ 1,082,672.1 | $ 839,195.7

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