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Cash Flow Information - Schedule of Liabilities Arising From Financing Activities (Detail) - TWD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance |  | $ 190,743.7 | $ 230,048.5
Financing Cash Flow |  |  | (34,381.1)
Non-cash changes Foreign Exchange Movement |  |  | 1,105.5
Non-cash changes Other Changes |  |  | (6,029.2)
Ending Balance |  |  | 190,743.7
IFRS 16 [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance | $ 194,469.1 | 210,647.3 |
Financing Cash Flow | 172,273.2 | (6,908.8) |
Non-cash changes Foreign Exchange Movement | (3,227.0) | (2,105.5) |
Non-cash changes Lease modifications | 7,742.2 | 419.7 |
Non-cash changes Other Changes | (1,287.2) | (7,583.6) |
Ending Balance | 369,970.3 | 194,469.1 | 210,647.3
Short-term loans [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance |  | 88,754.7 | 63,766.8
Financing Cash Flow |  |  | 23,923.0
Non-cash changes Foreign Exchange Movement |  |  | 1,064.9
Ending Balance |  |  | 88,754.7
Short-term loans [member] | IFRS 16 [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance | 118,522.3 | 88,754.7 |
Financing Cash Flow | (31,571.6) | 31,804.3 |
Non-cash changes Foreign Exchange Movement | 1,608.3 | (2,036.7) |
Ending Balance | 88,559.0 | 118,522.3 | 88,754.7
Guarantee deposits [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance |  | 10,189.0 | 16,080.6
Financing Cash Flow |  |  | (279.2)
Non-cash changes Foreign Exchange Movement |  |  | 423.5
Non-cash changes Other Changes |  |  | (6,035.9)
Ending Balance |  |  | 10,189.0
Guarantee deposits [member] | IFRS 16 [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance | 1,729.9 | 10,189.0 |
Financing Cash Flow | 129.5 | (639.1) |
Non-cash changes Foreign Exchange Movement | 1.8 | 4.5 |
Non-cash changes Other Changes | (1,511.2) | (7,824.5) |
Ending Balance | 350.0 | 1,729.9 | 10,189.0
Lease Liabilities [member] | IFRS 16 [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance | 17,316.9 | 19,903.6 |
Financing Cash Flow | (2,819.7) | (3,174.0) |
Non-cash changes Foreign Exchange Movement | (78.5) | (73.3) |
Non-cash changes Lease modifications | 7,742.2 | 419.7 |
Non-cash changes Other Changes | 227.7 | 240.9 |
Ending Balance | 22,388.6 | 17,316.9 | 19,903.6
Bonds payable [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance |  | 91,800.0 | 150,201.1
Financing Cash Flow |  |  | (58,024.9)
Non-cash changes Foreign Exchange Movement |  |  | (382.9)
Non-cash changes Other Changes |  |  | 6.7
Ending Balance |  |  | 91,800.0
Bonds payable [member] | IFRS 16 [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning Balance | 56,900.0 | 91,800.0 |
Financing Cash Flow | 204,535.0 | (34,900.0) |
Non-cash changes Foreign Exchange Movement | (4,758.6) |  |
Non-cash changes Other Changes | 28.7 |  |
Ending Balance | 256,705.1 | $ 56,900.0 | $ 91,800.0
Long-term bank loans [member] | IFRS 16 [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Financing Cash Flow | 2,000.0 |  |
Non-cash changes Other Changes | (32.4) |  |
Ending Balance | $ 1,967.6 |  |

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