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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, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($)
--- | --- | --- | ---
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | $ 26,408 | $ 883 | $ 30,076
Less: Loss allowance | (2,360) |  | (2,602)
Gross carrying amount [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | 28,768 |  | 32,678
Telecommunications Business [Member] | Loss allowance [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Less: Loss allowance | (799) |  | (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 | 20,080 |  | 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 | $ 19,281 |  | 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 | $ (1,502) |  | (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 | 5,699 |  | 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 | $ 4,197 |  | $ 4,086
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 | 2.00% | 2.00% | 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 | $ (56) |  | $ (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 | 19,020 |  | 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 | $ 18,964 |  | $ 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% | 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) |  | $ (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 | 4,054 |  | 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 | $ 4,051 |  | $ 3,914
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 | 0.00% | 0.00% | 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 | 25.00% | 25.00% | 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 | $ (26) |  | $ (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 | 268 |  | 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 | $ 242 |  | $ 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% | 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 | $ (5) |  | $ (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 | 78 |  | 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 | $ 73 |  | $ 80
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 | 0.00% | 0.00% | 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 | 68.00% | 68.00% | 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 | $ (28) |  | $ (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 | 75 |  | 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 | $ 47 |  | $ 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% | 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 | $ (5) |  | $ (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 | 52 |  | 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 | $ 47 |  | $ 82
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 | 0.00% | 0.00% | 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 | 83.00% | 83.00% | 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 | $ (35) |  | $ (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 | 47 |  | 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 | $ 12 |  | $ 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% | 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 | $ (11) |  | $ (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 | 30 |  | 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 | $ 19 |  | $ 5
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 | 11.00% | 11.00% | 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% | 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 | $ (26) |  | $ (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 | 41 |  | 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 | $ 15 |  | $ 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% | 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 | $ (5) |  | $ (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 |  | 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 | $ 7 |  | $ 4
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 | 17.00% | 17.00% | 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 | 96.00% | 96.00% | 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 | $ (27) |  | $ (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 | 28 |  | 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 | $ 1 |  | $ 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% | 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 | $ (1) |  | $ (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 | 1 |  | 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 | $ 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 | $ (601) |  | $ (418)
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 | 601 |  | 418
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 | $ (1,472) |  | $ (1,725)
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 | 1,472 |  | 1,725
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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