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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, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
--- | --- | --- | --- | ---
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 24,842 | $ 811 | $ 24,672 | $ 23,947
Less: Loss allowance | (1,102) |  | (1,365) |
Gross carrying amount [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | 25,944 |  | 26,037 |
Telecommunications Business [Member] | Loss allowance [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Less: Loss allowance | (765) |  | (761) |
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 | 18,292 |  | 18,254 |
Telecommunications Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 17,527 |  | 17,493 |
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 | $ (314) |  | (575) |
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 | 4,289 |  | 4,531 |
Project Business [Member] | Amortized Cost [Member] |  |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 3,975 |  | $ 3,956 |
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 | $ (50) |  | $ (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 | 17,066 |  | 17,163 |
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 | $ 17,016 |  | $ 17,113 |
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 | 3,869 |  | 3,798 |
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 | $ 3,866 |  | $ 3,795 |
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 | 20.00% | 20.00% | 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 | $ (22) |  | $ (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 | 346 |  | 310 |
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 | $ 324 |  | $ 288 |
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 | $ (17) |  | $ (6) |
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 | 101 |  | 119 |
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 | $ 84 |  | $ 113 |
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 | 3.00% | 3.00% | 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 | 65.00% | 65.00% | 64.00% |
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 | $ (29) |  | $ (20) |
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 | 135 |  | 87 |
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 | $ 106 |  | $ 67 |
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 | $ (1) |  | $ (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 | 12 |  | 11 |
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 | $ 11 |  | $ 10 |
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 | 12.00% | 12.00% | 11.00% |
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 | 82.00% | 82.00% | 80.00% |
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 | $ (29) |  | $ (21) |
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 | 70 |  | 33 |
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 | $ 41 |  | $ 12 |
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 | $ (5) |  | $ (16) |
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 | 18 |  | 53 |
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 | $ 13 |  | $ 37 |
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 | 23.00% | 23.00% | 25.00% |
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 | 91.00% | 91.00% | 90.00% |
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 | $ (35) |  | $ (20) |
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 | 48 |  | 28 |
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 | $ 13 |  | $ 8 |
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 | 40.00% | 40.00% | 45.00% |
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 | $ (22) |  | $ (29) |
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 | 49 |  | 34 |
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 | $ 27 |  | $ 5 |
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 |  | $ (1) |
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 | 1 |  | 2 |
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 | $ 1 |  | $ 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 | $ (578) |  | $ (599) |
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 | 578 |  | 599 |
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 | $ (287) |  | $ (547) |
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 | 287 |  | 547 |
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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