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Revenue - Summary of Contract Balances (Detail) $ in Millions, $ in Millions | Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
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Disclosure Of Contract Balance [Abstract] |  |  |  |
Trade notes and accounts receivable, net | $ 24,842 | $ 811 | $ 24,672 | $ 23,947
Contract assets |  |  |  |
Products and service bundling | 9,297 |  | 7,956 | 7,197
Others | 1,206 |  | 1,256 | 983
Less : Loss allowance | (21) |  | (19) | (18)
Contract assets | 10,482 |  | 9,193 | 8,162
Current Contract Assets | 6,713 | 219 | 6,056 | 5,554
Noncurrent Contract Assets | 3,769 | 123 | 3,137 | 2,608
Contract liabilities |  |  |  |
Telecommunications business | 14,016 |  | 14,081 | 13,144
Project business | 6,654 |  | 6,586 | 5,435
Advance land receipts | 460 |  | 0 | 0
Others | 518 |  | 397 | 495
Contract liabilities | 21,648 |  | 21,064 | 19,074
Current Contract Liabilities | 14,088 | 460 | 13,390 | 12,234
Noncurrent Contract Liabilities | 7,560 | $ 247 | 7,674 | 6,840
Contract liabilities | $ 21,648 |  | $ 21,064 | $ 19,074

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