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Revenue - Summary of Contract Balances (Detail) $ in Millions, $ in Millions | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
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Disclosure Of Contract Balance [Abstract] |  |  |  |
Trade notes and accounts receivable, net | $ 26,026 | $ 794 | $ 24,842 | $ 24,672
Contract assets |  |  |  |
Products and service bundling | 10,446 |  | 9,297 | 7,956
Others | 2,306 |  | 1,206 | 1,256
Less : Loss allowance | (24) |  | (21) | (19)
Contract assets | 12,728 |  | 10,482 | 9,193
Current Contract Assets | 8,401 | 256 | 6,713 | 6,056
Noncurrent Contract Assets | 4,327 | 132 | 3,769 | 3,137
Contract liabilities |  |  |  |
Telecommunications business | 13,931 |  | 14,016 | 14,081
Project business | 8,015 |  | 6,654 | 6,586
Advance house and land receipts | 1,064 |  | 460 | 0
Others | 832 |  | 518 | 397
Contract liabilities | 23,842 |  | 21,648 | 21,064
Current Contract Liabilities | 16,301 | 497 | 14,088 | 13,390
Noncurrent Contract Liabilities | 7,541 | $ 230 | 7,560 | 7,674
Contract liabilities | $ 23,842 |  | $ 21,648 | $ 21,064

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