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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, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Disclosure of detailed information about non-cash transaction [line items] |  |  |  |
Conversion of convertible bonds into equity securities | $ 0.0 |  | $ (120.5) | $ 0.0
Additions of financial assets at FVTOCI | 253,613.9 |  | 268,653.5 | 257,824.5
Payments for acquisition of financial assets at FVTOCI | 255,888.7 | $ 9,224.5 | 262,637.5 | 257,558.2
Disposal of financial assets at FVTOCI | 251,201.4 |  | 269,011.8 | 229,525.1
Additions of property, plant and equipment | 835,406.3 |  | 525,720.7 | 564,283.0
Exchange of assets | (3,256.5) |  | (1.1) | (3,287.1)
Changes in other financial assets | 2.9 |  | 10.5 | 22.2
Exchange of equity instruments | (106.2) |  |  |
Proceeds from disposal of financial assets at FVTOCI | 254,604.5 |  | 266,931.9 | 230,444.5
Transferred to initial carrying amount of hedged items | (41.4) |  | 20.3 | (82.3)
Changes in payables to contractors and equipment suppliers | 5,153.3 |  | (19,085.9) | (100,963.9)
Payments for acquisition of property, plant and equipment | 839,195.7 | 30,252.2 | 507,238.7 | 460,422.2
Changes in account payable | 8,298.3 | 299.2 | 404.6 | 5,860.1
Changes in accrued expenses and other current liabilities | 2,381.0 |  | (5,895.5) | (266.3)
Payments for acquisition of intangible assets | 9,040.7 | $ 325.9 | 9,542.4 | 9,329.9
Intangible assets [member] |  |  |  |
Disclosure of detailed information about non-cash transaction [line items] |  |  |  |
Additions of intangible assets | 9,318.5 |  | 12,559.5 | 9,237.7
Changes in account payable | 0.0 |  | 191.4 | 70.0
Changes in accrued expenses and other current liabilities | (280.7) |  | (3,219.0) |
Financial assets measured at fair value through other comprehensive income, category [member] |  |  |  |
Disclosure of detailed information about non-cash transaction [line items] |  |  |  |
Changes in other financial assets | 3,509.3 |  | (2,079.9) | 919.4
Payments for acquisition of intangible assets | 9,040.7 |  | 9,542.4 | 9,329.9
Property, plant and equipment [member] |  |  |  |
Disclosure of detailed information about non-cash transaction [line items] |  |  |  |
Changes in other financial assets | $ 1,934.0 |  | $ 584.7 | $ 472.5

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