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Trade Notes and Accounts Receivable, Net - Provision Matrix Arising from Telecommunications and Project Business (Detail) $ in Millions, $ in Millions | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
--- | --- | --- | --- | ---
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 26,026 | $ 794 | $ 24,842 | $ 24,672
Less: Loss allowance | 1,143 |  | 1,102 |
Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 27,169 |  | 25,944 |
Telecommunications Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | 813 |  | 765 |
Telecommunications Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 17,730 |  | 18,292 |
Telecommunications Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 16,917 |  | 17,527 |
Project Business [Member] | Bottom of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 50.00% | 50.00% |  |
Project Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 295 |  | 314 |
Project Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 5,959 |  | 4,289 |
Project Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 5,664 |  | $ 3,975 |
Not Past Due [Member] | Telecommunications Business [Member] | Bottom of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 0.00% | 0.00% | 0.00% |
Not Past Due [Member] | Telecommunications Business [Member] | Top of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 1.00% | 1.00% | 1.00% |
Not Past Due [Member] | Telecommunications Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 51 |  | $ 50 |
Not Past Due [Member] | Telecommunications Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 16,477 |  | 17,066 |
Not Past Due [Member] | Telecommunications Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 16,426 |  | $ 17,016 |
Not Past Due [Member] | Project Business [Member] | Bottom of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 0.00% | 0.00% | 0.00% |
Not Past Due [Member] | Project Business [Member] | Top of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 5.00% | 5.00% | 5.00% |
Not Past Due [Member] | Project Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 3 |  | $ 3 |
Not Past Due [Member] | Project Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 5,548 |  | 3,869 |
Not Past Due [Member] | Project Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 5,545 |  | $ 3,866 |
Less Than 30 Days [Member] | Telecommunications Business [Member] | Bottom of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 1.00% | 1.00% | 1.00% |
Less Than 30 Days [Member] | Telecommunications Business [Member] | Top of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 22.00% | 22.00% | 20.00% |
Less Than 30 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 24 |  | $ 22 |
Less Than 30 Days [Member] | Telecommunications Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 335 |  | 346 |
Less Than 30 Days [Member] | Telecommunications Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 311 |  | $ 324 |
Less Than 30 Days [Member] | Project Business [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 5.00% | 5.00% | 5.00% |
Less Than 30 Days [Member] | Project Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 2 |  | $ 17 |
Less Than 30 Days [Member] | Project Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 44 |  | 101 |
Less Than 30 Days [Member] | Project Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 42 |  | $ 84 |
31-60 Days [Member] | Telecommunications Business [Member] | Bottom of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 2.00% | 2.00% | 3.00% |
31-60 Days [Member] | Telecommunications Business [Member] | Top of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 68.00% | 68.00% | 65.00% |
31-60 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 34 |  | $ 29 |
31-60 Days [Member] | Telecommunications Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 139 |  | 135 |
31-60 Days [Member] | Telecommunications Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 105 |  | $ 106 |
31-60 Days [Member] | Project Business [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 10.00% | 10.00% | 10.00% |
31-60 Days [Member] | Project Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 8 |  | $ 1 |
31-60 Days [Member] | Project Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 83 |  | 12 |
31-60 Days [Member] | Project Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 75 |  | $ 11 |
61-90 Days [Member] | Telecommunications Business [Member] | Bottom of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 11.00% | 11.00% | 12.00% |
61-90 Days [Member] | Telecommunications Business [Member] | Top of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 84.00% | 84.00% | 82.00% |
61-90 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 31 |  | $ 29 |
61-90 Days [Member] | Telecommunications Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 75 |  | 70 |
61-90 Days [Member] | Telecommunications Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 44 |  | $ 41 |
61-90 Days [Member] | Project Business [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 30.00% | 30.00% | 30.00% |
61-90 Days [Member] | Project Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 1 |  | $ 5 |
61-90 Days [Member] | Project Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 3 |  | 18 |
61-90 Days [Member] | Project Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 2 |  | $ 13 |
91-120 Days [Member] | Telecommunications Business [Member] | Bottom of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 21.00% | 21.00% | 23.00% |
91-120 Days [Member] | Telecommunications Business [Member] | Top of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 92.00% | 92.00% | 91.00% |
91-120 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 33 |  | $ 35 |
91-120 Days [Member] | Telecommunications Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 50 |  | 48 |
91-120 Days [Member] | Telecommunications Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 17 |  | $ 13 |
91-120 Days [Member] | Project Business [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 50.00% | 50.00% | 50.00% |
91-120 Days [Member] | Project Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 1 |  | $ 1 |
91-120 Days [Member] | Project Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 1 |  | 1 |
91-120 Days [Member] | Project Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 0 |  | $ 0 |
121-180 Days [Member] | Telecommunications Business [Member] | Bottom of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 39.00% | 39.00% | 40.00% |
121-180 Days [Member] | Telecommunications Business [Member] | Top of Range [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 96.00% | 96.00% | 96.00% |
121-180 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 34 |  | $ 22 |
121-180 Days [Member] | Telecommunications Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 48 |  | 49 |
121-180 Days [Member] | Telecommunications Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 14 |  | $ 27 |
121-180 Days [Member] | Project Business [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 80.00% | 80.00% | 80.00% |
121-180 Days [Member] | Project Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 0 |  | $ 0 |
121-180 Days [Member] | Project Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 0 |  | 1 |
121-180 Days [Member] | Project Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 0 |  | $ 1 |
Over 180 Days [Member] | Telecommunications Business [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 100.00% | 100.00% | 100.00% |
Over 180 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 606 |  | $ 578 |
Over 180 Days [Member] | Telecommunications Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 606 |  | 578 |
Over 180 Days [Member] | Telecommunications Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 0 |  | $ 0 |
Over 180 Days [Member] | Project Business [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Expected credit loss rate | 100.00% | 100.00% | 100.00% |
Over 180 Days [Member] | Project Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | $ 280 |  | $ 287 |
Over 180 Days [Member] | Project Business [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 280 |  | 287 |
Over 180 Days [Member] | Project Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 0 |  | $ 0 |

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