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v3.21.1

Property, Plant and Equipment - Summary of assets used by the Company (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | $ 1,352,377.4 |  | $ 1,072,050.3 |
Additions | 525,720.7 |  | 564,283.0 | $ 300,024.4
Ending balance | 1,555,589.1 | $ 55,398.5 | 1,352,377.4 | 1,072,050.3
Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 1,352,313.9 |  |  |
Ending balance | 1,554,585.9 |  | 1,352,313.9 |
Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 3,372,779.1 | 3,080,615.1
Additions |  |  |  | 300,024.4
Disposals or retirements |  |  |  | (7,174.2)
Effect of exchange rate changes |  |  |  | (686.2)
Ending balance |  |  |  | 3,372,779.1
Cost [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 3,911,596.3 |  | 3,372,216.5 |
Additions | 525,720.7 |  | 564,283.0 |
Disposals or retirements | (7,172.9) |  | (18,583.9) |
Transfers from assets subject to operating leases | 23.1 |  |  |
Transfers to assets subject to operating leases | (1,199.0) |  |  |
Transfers from right-of-use assets |  |  | 619.8 |
Effect of disposal of subsidiary |  |  | (0.5) |
Effect of exchange rate changes | (2,744.4) |  | (6,938.6) |
Ending balance | 4,426,223.8 |  | 3,911,596.3 | 3,372,216.5
Accumulated depreciation [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 2,300,728.8 | 2,018,072.8
Additions |  |  |  | 288,124.9
Disposals or retirements |  |  |  | (5,962.6)
Impairment |  |  |  | 423.5
Effect of exchange rate changes |  |  |  | 70.2
Ending balance |  |  |  | 2,300,728.8
Accumulated depreciation [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 2,559,282.4 |  | 2,300,253.9 |
Additions | 321,821.1 |  | 278,764.9 |
Disposals or retirements | (6,773.2) |  | (14,067.3) |
Reversal of impairment |  |  | (301.4) |
Transfers from assets subject to operating leases | 8.2 |  |  |
Transfers to assets subject to operating leases | (202.6) |  |  |
Transfers from right-of-use assets |  |  | 20.7 |
Effect of disposal of subsidiary |  |  | (0.5) |
Impairment | 10.2 |  |  |
Effect of exchange rate changes | (2,508.2) |  | (5,387.9) |
Ending balance | 2,871,637.9 |  | 2,559,282.4 | 2,300,253.9
Land and Land Improvements [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 3,460.8 |
Ending balance |  |  |  | 3,460.8
Land and Land Improvements [Member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 3,453.1 |  |  |
Ending balance | 3,436.5 |  | 3,453.1 |
Land and Land Improvements [Member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 4,011.4 | 3,983.2
Effect of exchange rate changes |  |  |  | 28.2
Ending balance |  |  |  | 4,011.4
Land and Land Improvements [Member] | Cost [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 3,991.8 |  | 4,011.4 |
Effect of exchange rate changes | (49.2) |  | (19.6) |
Ending balance | 3,942.6 |  | 3,991.8 | 4,011.4
Land and Land Improvements [Member] | Accumulated depreciation [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 550.6 | 510.5
Additions |  |  |  | 20.9
Effect of exchange rate changes |  |  |  | 19.2
Ending balance |  |  |  | 550.6
Land and Land Improvements [Member] | Accumulated depreciation [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 538.7 |  | 550.6 |
Additions | 1.5 |  | 1.6 |
Effect of exchange rate changes | (34.1) |  | (13.5) |
Ending balance | 506.1 |  | 538.7 | 550.6
Buildings [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 200,340.2 |
Ending balance |  |  |  | 200,340.2
Buildings [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 195,015.7 |  |  |
Ending balance | 250,647.9 |  | 195,015.7 |
Buildings [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 418,714.3 | 379,134.6
Additions |  |  |  | 40,396.4
Disposals or retirements |  |  |  | (410.9)
Effect of exchange rate changes |  |  |  | (405.8)
Ending balance |  |  |  | 418,714.3
Buildings [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 438,075.0 |  | 418,151.7 |
Additions | 84,882.5 |  | 21,448.5 |
Disposals or retirements | (41.5) |  | (159.0) |
Transfers from assets subject to operating leases | 23.1 |  |  |
Effect of exchange rate changes | (491.7) |  | (1,366.2) |
Ending balance | 522,447.4 |  | 438,075.0 | 418,151.7
Buildings [member] | Accumulated depreciation [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 218,374.1 | 194,446.5
Additions |  |  |  | 24,293.4
Disposals or retirements |  |  |  | (399.0)
Effect of exchange rate changes |  |  |  | 33.2
Ending balance |  |  |  | 218,374.1
Buildings [member] | Accumulated depreciation [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 243,059.3 |  | 217,899.2 |
Additions | 29,209.1 |  | 26,026.6 |
Disposals or retirements | (27.9) |  | (144.4) |
Transfers from assets subject to operating leases | 8.2 |  |  |
Effect of exchange rate changes | (449.2) |  | (722.1) |
Ending balance | 271,799.5 |  | 243,059.3 | 217,899.2
Machinery and equipment |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 679,481.2 |
Reversal of impairment |  |  | (301.4) |
Impairment |  |  |  | 423.5
Ending balance |  |  |  | 679,481.2
Machinery and equipment | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 608,357.0 |  |  |
Ending balance | 1,051,475.7 |  | 608,357.0 |
Machinery and equipment | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 2,728,760.2 | 2,487,752.3
Additions |  |  |  | 247,042.3
Disposals or retirements |  |  |  | (5,972.5)
Effect of exchange rate changes |  |  |  | (61.9)
Ending balance |  |  |  | 2,728,760.2
Machinery and equipment | Cost [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 2,886,623.0 |  | 2,728,760.2 |
Additions | 729,943.3 |  | 179,798.4 |
Disposals or retirements | (6,397.3) |  | (17,381.6) |
Transfers to assets subject to operating leases | (1,199.0) |  |  |
Transfers from right-of-use assets |  |  | 619.8 |
Effect of exchange rate changes | (1,964.3) |  | (5,173.8) |
Ending balance | 3,607,005.7 |  | 2,886,623.0 | 2,728,760.2
Machinery and equipment | Accumulated depreciation [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 2,049,279.0 | 1,795,448.9
Additions |  |  |  | 258,195.3
Disposals or retirements |  |  |  | (4,773.6)
Impairment |  |  |  | 423.5
Effect of exchange rate changes |  |  |  | (15.1)
Ending balance |  |  |  | 2,049,279.0
Machinery and equipment | Accumulated depreciation [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 2,278,266.0 |  | 2,049,279.0 |
Additions | 285,393.6 |  | 246,724.2 |
Disposals or retirements | (6,012.9) |  | (12,880.8) |
Reversal of impairment |  |  | (301.4) |
Transfers to assets subject to operating leases | (202.6) |  |  |
Transfers from right-of-use assets |  |  | 20.7 |
Impairment | 10.2 |  |  |
Effect of exchange rate changes | (1,924.3) |  | (4,575.7) |
Ending balance | 2,555,530.0 |  | 2,278,266.0 | 2,049,279.0
Office equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 15,857.1 |
Ending balance |  |  |  | 15,857.1
Office equipment [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 17,193.0 |  |  |
Ending balance | 25,060.4 |  | 17,193.0 |
Office equipment [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 48,382.2 | 42,391.5
Additions |  |  |  | 6,773.4
Disposals or retirements |  |  |  | (790.8)
Effect of exchange rate changes |  |  |  | 8.1
Ending balance |  |  |  | 48,382.2
Office equipment [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 54,611.4 |  | 48,382.2 |
Additions | 15,112.9 |  | 7,415.0 |
Disposals or retirements | (734.1) |  | (1,043.3) |
Effect of disposal of subsidiary |  |  | (0.5) |
Effect of exchange rate changes | (127.5) |  | (142.0) |
Ending balance | 68,862.7 |  | 54,611.4 | 48,382.2
Office equipment [member] | Accumulated depreciation [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 32,525.1 | 27,666.9
Additions |  |  |  | 5,615.3
Disposals or retirements |  |  |  | (790.0)
Effect of exchange rate changes |  |  |  | 32.9
Ending balance |  |  |  | 32,525.1
Office equipment [member] | Accumulated depreciation [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 37,418.4 |  | 32,525.1 |
Additions | 7,216.9 |  | 6,012.5 |
Disposals or retirements | (732.4) |  | (1,042.1) |
Effect of disposal of subsidiary |  |  | (0.5) |
Effect of exchange rate changes | (100.6) |  | (76.6) |
Ending balance | 43,802.3 |  | 37,418.4 | 32,525.1
Equipment under installation and construction in progress [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 172,911.0 |
Ending balance |  |  |  | 172,911.0
Equipment under installation and construction in progress [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 528,295.1 |  |  |
Ending balance | 223,965.4 |  | 528,295.1 |
Equipment under installation and construction in progress [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 172,911.0 | 167,353.5
Additions |  |  |  | 5,812.3
Effect of exchange rate changes |  |  |  | (254.8)
Ending balance |  |  |  | 172,911.0
Equipment under installation and construction in progress [member] | Cost [member] | Property, plant and equipment not subject to operating leases [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | 528,295.1 |  | 172,911.0 |
Additions | (304,218.0) |  | 355,621.1 |
Effect of exchange rate changes | (111.7) |  | (237.0) |
Ending balance | $ 223,965.4 |  | $ 528,295.1 | $ 172,911.0

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