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Cash Flow Information - Schedule of Liabilities Arising From Financing Activities (Detail) - IFRS 16 [Member] - TWD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance | $ 369,620.3 | $ 192,739.2 | $ 200,458.3
Financing Cash Flow | 396,255.2 | 172,143.7 | (6,269.7)
Non-cash changes Foreign Exchange Movement | (12,506.7) | (3,228.8) | (2,110.0)
Non-cash changes Lease modifications | 2,619.4 | 7,742.2 | 419.7
Non-cash changes Other Changes | (179.8) | 224.0 | 240.9
Ending Balance | 755,808.4 | 369,620.3 | 192,739.2
Short-term loans [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance | 88,559.0 | 118,522.3 | 88,754.7
Financing Cash Flow | 35,668.4 | (31,571.6) | 31,804.3
Non-cash changes Foreign Exchange Movement | (8,777.5) | 1,608.3 | (2,036.7)
Non-cash changes Other Changes | (528.6) |  |
Ending Balance | 114,921.3 | 88,559.0 | 118,522.3
Lease Liabilities [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance | 22,388.6 | 17,316.9 | 19,903.6
Financing Cash Flow | (2,178.3) | (2,819.7) | (3,174.0)
Non-cash changes Foreign Exchange Movement | (82.3) | (78.5) | (73.3)
Non-cash changes Lease modifications | 2,619.4 | 7,742.2 | 419.7
Non-cash changes Other Changes | 193.3 | 227.7 | 240.9
Ending Balance | 22,940.7 | 22,388.6 | 17,316.9
Bonds payable [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance | 256,705.1 | 56,900.0 | 91,800.0
Financing Cash Flow | 361,255.1 | 204,535.0 | (34,900.0)
Non-cash changes Foreign Exchange Movement | (3,646.9) | (4,758.6) |
Non-cash changes Other Changes | 157.3 | 28.7 |
Ending Balance | 614,470.6 | 256,705.1 | $ 56,900.0
Long-term bank loans [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance | 1,967.6 |  |
Financing Cash Flow | 1,510.0 | 2,000.0 |
Non-cash changes Other Changes | (1.8) | (32.4) |
Ending Balance | $ 3,475.8 | $ 1,967.6 |

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