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Trade Notes and Accounts Receivable, Net - Aging Analysis for Trade Notes and Accounts Receivable (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
--- | --- | --- | ---
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | $ 31,941 | $ 1,077 | $ 31,022
Gross carrying amount [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | 34,058 |  | 32,795
Gross carrying amount [Member] | Non-overdue [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | 30,032 |  | 29,596
Gross carrying amount [Member] | Less than 30 days [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | 1,280 |  | 1,050
Gross carrying amount [Member] | 31-60 days [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | 485 |  | 348
Gross carrying amount [Member] | 61-90 days [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | 278 |  | 286
Gross carrying amount [Member] | 91-120 days [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | 253 |  | 198
Gross carrying amount [Member] | 121-180 days [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | 122 |  | 119
Gross carrying amount [Member] | More than 181 days [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |  |
Trade notes and accounts receivable | $ 1,608 |  | $ 1,198

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