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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, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($)
--- | --- | --- | ---
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | $ 30,076 | $ 983 | $ 31,941
Less: Loss allowance | (2,602) |  | (2,117)
Gross Carrying Amount [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | 32,678 |  | 34,058
Telecommunications Business [Member] | Loss allowance [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Less: Loss allowance | (631) |  |
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 | 24,397 |  |
Telecommunications Business [Member] | Amortized Cost [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | $ 23,766 |  |
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 | $ (1,913) |  |
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 | 5,999 |  |
Project Business [Member] | Amortized Cost [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | $ 4,086 |  |
Not Past Due [Member] | Gross Carrying Amount [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable |  |  | 30,032
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% |
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 | 3.00% | 3.00% |
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 | $ (80) |  |
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 | 23,307 |  |
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 | $ 23,227 |  |
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% |
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% |
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 | $ (153) |  |
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 | 4,067 |  |
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 | $ 3,914 |  |
Less than 30 days [Member] | Gross Carrying Amount [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable |  |  | 1,280
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 | 3.00% | 3.00% |
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 | 30.00% | 30.00% |
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 | $ (27) |  |
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 | 455 |  |
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 | $ 428 |  |
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% |
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 | $ (8) |  |
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 | 88 |  |
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 | $ 80 |  |
31-60 days [Member] | Gross Carrying Amount [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable |  |  | 485
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 | 7.00% | 7.00% |
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 | 69.00% | 69.00% |
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 | $ (24) |  |
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 | 95 |  |
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 | $ 71 |  |
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% |
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 | $ (10) |  |
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 | 92 |  |
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 | $ 82 |  |
61-90 days [Member] | Gross Carrying Amount [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable |  |  | 278
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 | 19.00% | 19.00% |
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% |
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) |  |
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 | 49 |  |
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 | $ 20 |  |
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% |
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 | $ (3) |  |
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 | 8 |  |
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 | $ 5 |  |
91-120 days [Member] | Gross Carrying Amount [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable |  |  | 253
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 | 32.00% | 32.00% |
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 | 90.00% | 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 | $ (28) |  |
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 | 37 |  |
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 | $ 9 |  |
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% |
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 | $ (8) |  |
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 | 12 |  |
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 | $ 4 |  |
121-180 days [Member] | Gross Carrying Amount [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable |  |  | 122
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 | 61.00% | 61.00% |
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 | 95.00% | 95.00% |
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 | $ (25) |  |
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 | 36 |  |
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 | $ 11 |  |
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% |
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 | $ (6) |  |
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 | 7 |  |
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 |  |
Over 181 Days [Member] | Gross Carrying Amount [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable |  |  | $ 1,608
Over 181 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% |
Over 181 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Less: Loss allowance | $ (418) |  |
Over 181 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 | 418 |  |
Over 181 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 |  |
Over 181 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% |
Over 181 Days [Member] | Project Business [Member] | Loss allowance [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Less: Loss allowance | $ (1,725) |  |
Over 181 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 | 1,725 |  |
Over 181 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 |  |

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