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Lease Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2024
Texts Block [Abstract] |
Right-of-use assets |
| a. | Right-of-use assets
|  | December 31, 2023 |  |  | December 31, 2024 |
|  |  |  |  | NT$ |  |  |  |  |  |  |  |  | NT$ |  |  |  |
|  |  |  |  | (In Millions) |  |  |  |  |  |  |  |  | (In Millions) |  |  |  |
Carrying amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  | $ | 37,437.1 |  |  |  |  |  |  |  |  |  |  | $ | 36,981.0 |  |  |  |  |
Buildings |  |  |  |  |  |  | 2,946.0 |  |  |  |  |  |  |  |  |  |  |  | 3,103.9 |  |  |  |  |
Office equipment |  |  |  |  |  |  | 41.6 |  |  |  |  |  |  |  |  |  |  |  | 43.5 |  |  |  |  |
|  |  |  |  |  | $ | 40,424.7 |  |  |  |  |  |  |  |  |  |  | $ | 40,128.4 |  |  |  |  |
|  | Years Ended December 31 |
|  | 2022 |  |  | 2023 |  |  | 2024 |
|  |  |  |  | NT$ |  |  |  |  |  |  |  |  | NT$ |  |  |  |  |  |  |  |  | NT$ |  |  |  |
|  |  |  |  | (In Millions) |  |  |  |  |  |  |  |  | (In Millions) |  |  |  |  |  |  |  |  | (In Millions) |  |  |  |
Additions to right-of-use assets |  |  |  |  |  | $ | 12,610.7 |  |  |  |  |  |  |  |  |  |  | $ | 2,145.4 |  |  |  |  |  |  |  |  |  |  | $ | 4,579.6 |  |  |  |  |
Depreciation of right-of-use assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  | $ | 2,119.8 |  |  |  |  |  |  |  |  |  |  | $ | 2,459.1 |  |  |  |  |  |  |  |  |  |  | $ | 2,541.9 |  |  |  |  |
Buildings |  |  |  |  |  |  | 928.7 |  |  |  |  |  |  |  |  |  |  |  | 976.1 |  |  |  |  |  |  |  |  |  |  |  | 1,114.3 |  |  |  |  |
Machinery and equipment |  |  |  |  |  |  | 0.9 |  |  |  |  |  |  |  |  |  |  |  | 0.4 |  |  |  |  |  |  |  |  |  |  |  | - |  |  |  |  |
Office equipment |  |  |  |  |  |  | 23.6 |  |  |  |  |  |  |  |  |  |  |  | 23.4 |  |  |  |  |  |  |  |  |  |  |  | 23.3 |  |  |  |  |
|  |  |  |  |  | $ | 3,073.0 |  |  |  |  |  |  |  |  |  |  | $ | 3,459.0 |  |  |  |  |  |  |  |  |  |  | $ | 3,679.5 |  |  |  |  |
Lease liabilities |
| b. | Lease liabilities
|  | December 31, 2023 |  |  | December 31, 2024 |
|  |  |  |  | NT$ |  |  |  |  |  |  |  |  | NT$ |  |  |  |
|  |  |  |  | (In Millions) |  |  |  |  |  |  |  |  | (In Millions) |  |  |  |
Carrying amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion (classified under accrued expenses and other current liabilities) |  |  |  |  |  | $ | 2,810.6 |  |  |  |  |  |  |  |  |  |  | $ | 3,049.0 |  |  |  |  |
Noncurrent portion |  |  |  |  |  |  | 28,681.8 |  |  |  |  |  |  |  |  |  |  |  | 28,755.3 |  |  |  |  |
|  |  |  |  |  | $ | 31,492.4 |  |  |  |  |  |  |  |  |  |  | $ | 31,804.3 |  |  |  |  |
Ranges of discount rates for lease liabilities are as follows:
|  | December 31, 2023 |  | December 31, 2024
Land |  |  |  | 0.39%-2.30% |  |  |  |  |  | 0.39%-2.30% |  |
Buildings |  |  |  | 0.57%-6.52% |  |  |  |  |  | 0.40%-6.52% |  |
Office equipment |  |  |  | 0.28%-7.13% |  |  |  |  |  | 0.28%-6.46% |  |
Other lease information |
| d. | Other lease information
|  | Years Ended December 31 |
|  | 2022 |  |  | 2023 |  |  | 2024 |
|  |  |  |  | NT$ |  |  |  |  |  |  |  |  | NT$ |  |  |  |  |  |  |  |  | NT$ |  |  |  |
|  |  |  |  | (In Millions) |  |  |  |  |  |  |  |  | (In Millions) |  |  |  |  |  |  |  |  | (In Millions) |  |  |  |
Expenses relating to short-term leases |  |  |  |  |  | $ | 4,731.1 |  |  |  |  |  |  |  |  |  |  | $ | 1,215.1 |  |  |  |  |  |  |  |  |  |  | $ | 181.2 |  |  |  |  |
Total cash outflow for leases |  |  |  |  |  | $ | 7,618.3 |  |  |  |  |  |  |  |  |  |  | $ | 4,916.9 |  |  |  |  |  |  |  |  |  |  | $ | 3,415.5 |  |  |  |  |

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