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Lease Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2021
Text Block [Abstract] |
Right-of-use assets |
| a. | Right-of-use assets
|  | December 31, 2020 |  |  | December 31, 2021 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Carrying amounts |  |  |  |  |  |  |  |
Land |  | $ | 25,141.9 |  |  | $ | 29,778.6 |
Buildings |  |  | 2,544.8 |  |  |  | 2,918.1 |
Machinery and equipment |  |  | — |  |  |  | 3.4 |
Office equipment |  |  | 41.8 |  |  |  | 34.3 |
|  | $ | 27,728.5 |  |  | $ | 32,734.4 |
|  | Years Ended December 31 |
|  | 2019 |  |  | 2020 |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Additions to right-of-use assets |  | $ | 1,033.0 |  |  | $ | 13,481.2 |  |  | $ | 7,769.8 |
Depreciation of right-of-use assets |  |  |  |  |  |  |  |  |  |  |  |
Land |  | $ | 957.1 |  |  | $ | 1,312.9 |  |  | $ | 1,825.7 |
Buildings |  |  | 458.8 |  |  |  | 569.5 |  |  |  | 707.9 |
Machinery and equipment |  |  | 1,184.4 |  |  |  | 775.8 |  |  |  | 0.5 |
Office equipment |  |  | 22.4 |  |  |  | 23.4 |  |  |  | 22.1 |
|  | $ | 2,622.7 |  |  | $ | 2,681.6 |  |  | $ | 2,556.2 |
Income from subleasing right-of-use assets (classified under other operating income and expenses, net) |  | $ | 55.0 |  |  | $ | 79.6 |  |  | $ | 82.0 |
Lease liabilities |
b.  Lease liabilities
|  | December 31, 2020 |  |  | December 31, 2021 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Carrying amounts |  |  |  |  |  |  |  |
Current portion (classified under accrued expenses and other current liabilities) |  | $ | 1,828.0 |  |  | $ | 2,176.5 |
Noncurrent portion |  |  | 20,560.6 |  |  |  | 20,764.2 |
|  | $ | 22,388.6 |  |  | $ | 22,940.7 |
Ranges of discount rates for lease liabilities |
Ranges of discount rates for lease liabilities are as follows:
|  | December 31, 2020 |  | December 31, 2021 |
Land |  | 0.48%-2.14% |  |  | 0.39%-2.14 | %
Buildings |  | 0.54%-3.88% |  |  | 0.39%-3.88 | %
Machinery and equipment |  | — |  |  | 0.71% |
Office equipment |  | 0.28%-3.88% |  |  | 0.28%-3.88 | %
Maturity analysis of lease payments receivable | The maturity analysis of lease payments receivable under operating subleases is as follows:
|  | December 31, 2020 |  |  | December 31, 2021 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Year 1 |  | $ | 144.1 |  |  | $ | 60.8 |
Other lease information |
| e. | Other lease information
|  | Years Ended December 31 |
|  | 2019 |  |  | 2020 |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Expenses relating to short-term leases |  | $ | 5,007.1 |  |  | $ | 3,153.5 |  |  | $ | 5,250.3 |
Expenses relating to variable lease payments not included in the measurement of lease liabilities |  | $ | 195.1 |  |  | $ | 257.0 |  |  | $ | 168.7 |
|  | Years Ended December 31 |
|  | 2019 |  |  | 2020 |  |  | 2021 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Total cash outflow for leases |  | $ | 7,724.4 |  |  | $ | 6,354.6 |  |  | $ | 7,510.8 |

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