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Revenue - Summary of Contract Balances (Detail) $ in Millions, $ in Millions | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
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Disclosure Of Contract Balance [Abstract] |  |  |  |
Trade notes and accounts receivable, net | $ 26,408 | $ 883 |  | $ 30,076
Contract assets |  |  |  |
Products and service bundling | 6,943 |  |  | 7,123
Other | 116 |  |  | 109
Less : Loss allowance | (17) |  |  | (19)
Contract assets | 7,042 |  |  | 7,213
Current Contract Assets | 4,441 | 148 |  | 4,869
Noncurrent Contract Assets | 2,601 | 87 |  | 2,344
Contract liabilities |  |  |  |
Telecommunications business | 12,772 |  |  | 8,193
Project business | 10,360 |  |  | 4,508
Products and service bundling | 39 |  |  | 106
Other | 510 |  |  | 476
Contract liabilities | 23,681 |  |  | 13,283
Current Contract Liabilities | 16,840 | 563 | $ 10,902 | 10,688
Noncurrent Contract Liabilities | 6,841 | $ 229 | $ 6,078 | 2,595
Contract liabilities | $ 23,681 |  |  | $ 13,283

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- Definition The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_105&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_116_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_105&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_116_a&doctype=Standard -URIDate 2019-03-27 + Details
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